KB Electronics KBVF-21D User manual

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 1 of 20
Front Page
Installation and Operation Manual
KBVF SERIES
Chassis / IP-20 Inverters
Variable Speed / Soft-Start AC Motor Drive
with Electronic Motor Overload Protection*
Rated for 208-230 Volt 50 & 60 Hz
3-Phase & PSC** AC Induction Motors
from Subfractional thru 1½ HP
Operates from 115 and 208/230 Volt
50/60 Hz AC Line Input
See Safety Warning, on page XX.
This manual covers Models
KBVF-21D, 22D, 13, 23, 23D, 14, 24, 24D, 26D
Note: The drive is factory set for 60 Hz motors. For 50 Hz motors, see Section 6.2, on page XX.
The information contained in this manual is intended to be accurate. However, the manufacturer
retains the right to make changes in design which may not be included herein.
*** A Complete Line of Motor Drives ****
* UL approved as an electronic overload protector for motors. ** Custom software is required for PSC
motors. See PSC Motor Addendum (Part No. AXXXXX). *** Requires CE approved RFI Filter. See RFI
Filters & Chokes Selection Guide D-321 (Part No. A42027) for selection of filters to meet the Industrial or
Residential Standard. **** Models KBVF-22D, 13, 23, 23D, 14, 24, 24D, 26D are UL Listed for USA and
Canada. Other models pending.
© 2005 KB Electronics, Inc. (see back cover)

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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#(617"#"89%8'()*:+.-/01&%$'(32;(5"
(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 2 of 20
Table of Contents
Section Page
1 Quick-Start Instructions...........................................................................................................................................................................XX
2 Safety Warning........................................................................................................................................................................................XX
3 Introduction.............................................................................................................................................................................................XX
4 Important Application Information............................................................................................................................................................XX
5 Finger-Safe Cover...................................................................................................................................................................................XX
6 Setting Selectable Jumpers.....................................................................................................................................................................XX
7 Mounting Instructions..............................................................................................................................................................................XX
8 Recommended High Voltage Dielectric Withstand Testing (Hi-Pot Testing).............................................................................................XX
9 Wiring Instructions...................................................................................................................................................................................XX
10 AC Line Fusing........................................................................................................................................................................................XX
11 Drive Operation.......................................................................................................................................................................................XX
12 Diagnostic LEDs......................................................................................................................................................................................XX
13 Trimpot Adjustments ...............................................................................................................................................................................XX
Limited Warranty.............................................................................................................................................................................................XX
Table Page
1 General Performance Specifications .......................................................................................................................................................XX
2 Electrical Ratings ....................................................................................................................................................................................XX
3 Fault Recovery and Resetting the Drive ..................................................................................................................................................XX
4 Drive Operating Condition and Status LED Indicator...............................................................................................................................XX
Figure Page
1 Quick-Start Connection Diagram.............................................................................................................................................................XX
2 Models KBVF-21D, 22D, 13, 23, 23D Mechanical Specifications and Control Layout..............................................................................XX
3 Models KBVF-14, 24, 24D, 26D Mechanical Specifications and Control Layout ......................................................................................XX
4 Expanded View of Jumpers and Trimpots ...............................................................................................................................................XX
5 Maximum Allowed Motor Torque vs. Speed.............................................................................................................................................XX
6 Open Ventilated Motor with External Cooling...........................................................................................................................................XX
7 Models KBVF-21D, 22D, 23D, 24D AC Line Input Voltage Selection.......................................................................................................XX
8 Model KBVF-26D AC Line Input Voltage Selection..................................................................................................................................XX
9 Removing Jumper J1 on Model KBVF-26D.............................................................................................................................................XX
10 60 Hz and 50 Hz Motor Selection............................................................................................................................................................XX
11 Available Torque vs. Output Frequency...................................................................................................................................................XX
12 120 Hz and 100 Hz Drive Output Frequency Selection............................................................................................................................XX
13 Automatic Start........................................................................................................................................................................................XX
14 Forward/Reverse Speed Selection..........................................................................................................................................................XX
15 Typical Hi-Pot Setup................................................................................................................................................................................XX
16 AC Line Input, Motor, and Ground Connections ......................................................................................................................................XX
17 Main Speed Potentiometer Connection...................................................................................................................................................XX
18 Voltage Following Connection.................................................................................................................................................................XX
19 Manual Start Switch Connection..............................................................................................................................................................XX
20 Forward-Stop-Reverse Switch Connection..............................................................................................................................................XX
21 Enable Switch connection .......................................................................................................................................................................XX
22 Minimum Speed Trimpot (MIN) Range ....................................................................................................................................................XX
23 Maximum Speed Trimpot (MAX) Range..................................................................................................................................................XX
24 Acceleration Trimpot (ACC) Range .........................................................................................................................................................XX
25 Deceleration Trimpot (DEC/B) Range......................................................................................................................................................XX
26 Slip Compensation Trimpot (COMP) Range............................................................................................................................................XX
27 Boost Trimpot (DEC/B) Range ................................................................................................................................................................XX
28 Model KBVF-21D Current Limit Trimpot (CL) Range...............................................................................................................................XX
29 Model KBVF-22D Current Limit Trimpot (CL) Range...............................................................................................................................XX
30 Models KBVF-13, 23, 23D Current Limit Trimpot (CL) Range..................................................................................................................XX
31 Models KBVF-14, 24, 24D Current Limit Trimpot (CL) Range..................................................................................................................XX
32 Model KBVF-26D Current Limit Trimpot (CL) Range...............................................................................................................................XX
Items Included in this Package:
KBVF Adjustable Frequency Drive, KBVF Series Installation and Operation Manual, Main Speed Potentiometer Kit with Insulator and
Mounting Hardware, Main Speed Potentiometer Terminals (3 Orange), Motor and AC Line Terminals (5 Blue), 2-Wire and 3-Wire Connector
Kit, Status Indicator Label, Trimpot Adjustment Tool, CE Approved Product Information Card, Warranty Registration Card.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 3 of 20
Figure 1
Quick-Start Connection Diagram
1 QUICK-START INSTRUCTIONS
Important: You must read these simplified instructions before proceeding. These instructions are to be used as a reference only and are
not intended to replace the details provided herein. You must read the Safety Warning on, page XX, before proceeding.
See Section 4 - Important Application Information, on page XX.
WARNING! Disconnect main power when making connections to the drive.
1.1 AC Line Connection: Wire the single-phase AC line input to Terminals "L1" and "L2", as shown in Figure 16, on page XX. See
Section 9.1, on page XX.
Note: The rated AC line voltage of the drive must match the actual AC line input voltage. On Models KBVF-21D, 22D, 23D, 24D, 26D, the setting of
Jumper J1 (on upper PC board) must match the AC line input voltage.
Models KBVF-13, 14: Rated for 115 Volt AC line input only.
Models KBVF-23, 24: Rated for 208/230 Volt AC line input only.
Models KBVF-21D, 22D, 23D, 24D, 26D*: Rated for 208/230 Volt AC line input with Jumper J1 (on upper PC board) set to the
"230V" position (factory setting). Rated for 115 Volt AC line input with Jumper J1 (on upper PC board) set to the "115V" position ).
* On Model KBVF-26D, Jumper J1 is labeled "115VAC" and "230VAC".
1.2 Ground Connection: Connect the ground wire (earth) to the ground screw, as shown in Figure 16, on page XX. See Section 9.2,
on page XX.
Note: Model KBVF-21D, due to its double insulated design, does not contain a ground screw.
1.3 AC Line Fusing: It is recommended that a fuse(s) or circuit breaker be installed in the AC line. Fuse each conductor that is not at
ground potential. For the recommended fuse size, see Table 1, on page XX. Also see Section 10, on page XX.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 4 of 20
1.4 Motor Connection: Wire the motor to quick-connect Terminals "U", "V", "W", as shown in Figure 16, on page XX. (Special reactors
may be required for cable lengths over 100 ft (30 m) – consult our Sales Department.) See Section 9.3, on page XX.
Note: The drive is programmed to operate 3-phase AC induction motors. For PSC motors, optional software is required –contact our Sales
Department.
1.5 60 Hz and 50 Hz Motor Operation (Jumpers J1 and J2 On the Lower PC Board): The drive is factory set for 60 Hz motor
operation (Jumper J1 set to the "60Hz" position and Jumper J2 set to the "X1" position). For 50 Hz motor operation, set Jumper J1
to "50Hz" position and be sure Jumper J2 is set to the "X1" position. See Section 6.2.1, on page XX.
1.6 Trimpot Settings: All trimpots have been factory set for most applications, as shown in Figure 4, on page XX. Some applications
require adjustment of the trimpots in order to tailor the drive for a specific requirement. See Section 13, on pages XX-XX.
1.7 Main Speed Potentiometer Connection: For unidirectional speed operation, wire the 5 k

potentiometer to Terminals "P1" (low),
"P2" (wiper), "P3" (high). See Section 9.4, on page XX.
1.8 Voltage Following: An isolated* 0-5 Volt DC analog signal input can be used to control motor speed in lieu of the Main Speed
Potentiometer. The drive output will linearly follow the analog signal input. Connect the signal input positive lead (+) to Terminal
"P2" and the negative lead (-) to Terminal "P1". See Section 9.5, on page XX.
*If a non-isolated signal is used, install the SIVFR - Signal Isolator (Part No. 9597). The SIVFR accepts voltage (0 to ±2.5 thru 0 to ±25 Volts DC) or
current (4 - 20 mA DC) signal inputs. See Section 3.5, on page XX.
Note: For signal following operation, the Minimum Speed Trimpot (MIN) must be set fully counterclockwise.
WARNING! The signal input must be isolated from the AC line. Earth grounding signal wiring will damage the drive
and void the warranty. It is recommended that the SIVFR - Signal Isolator and Run/Fault Relay (Part No. 9597) be installed
when using signal following.
2 SAFETY WARNING
Definition of Safety Warning Symbols
Electrical Hazard Warning Symbol: Failure to observe this warning could result in electrical shock or electrocution.
Operational Hazard Warning Symbol: Failure to observe this warning could result in serious injury or death.
This product should be installed and serviced by a qualified technician, electrician, or electrical maintenance person familiar with
its operation and the hazards involved. Proper installation, which includes installation of the Finger-Safe Cover, wiring, mounting in
proper enclosure, fusing or other current protection, and grounding can reduce the chance of electrical shocks, fires, or explosion in this
product or products used with this product, such as electric motors, switches, coils, solenoids, and/or relays. Eye protection must be
worn and insulated adjustment tools must be used when working with drive under power. This product is constructed of materials
(plastics, metals, carbon, silicon, etc.) which may be a potential hazard. Proper shielding, grounding, and filtering of this product can
reduce the emission of radio frequency interference (RFI) which may adversely affect sensitive electronic equipment. It is the
responsibility of the equipment manufacturer and individual installer to supply this Safety Warning to the ultimate end user of this product.
(SW/FSC 5/2005) Be sure to follow all instructions carefully. Fire and/or electrocution can result due to improper use of this product.
This product complies with all CE directives pertinent at the time of manufacture. Contact our Sales Department for Declaration
of Conformity. Installation of a CE approved RFI filter is required. See RFI Filters & Chokes Selection Guide D-321 (Part No. A42027)
for selection of filters to meet the Industrial or Residential Standard. Additional shielded cable and/or AC line cables may be required
along with a signal isolator (SIVFR (Part No. 9597)).

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 5 of 20
3 INTRODUCTION
Thank you for purchasing the KBVF Adjustable Frequency Drive. KB Electronics, Inc. is committed to providing total customer satisfaction
by producing quality products that are easy to install and operate. The KBVF is manufactured with surface mount components
incorporating advanced circuitry and technology. The Finger-Safe Cover is included for added liability protection.
The KBVF Adjustable Frequency Drives provide variable speed control for standard 3-phase and Permanent Split Capacitor (PSC) AC
induction motors from subfractional thru 1½ HP. This manual covers models with single-phase AC line input only. The sine wave coded
Pulse Width Modulated (PWM) output operates at a carrier frequency of 16 kHz, which provides high motor efficiency and low noise.
Adjustable linear acceleration and deceleration are provided, making the drive suitable for soft-start applications.
Due to its user-friendly design, the KBVF is easy to install and operate. Tailoring to specific applications is accomplished with selectable
jumpers and trimpots, which eliminate the computer-like programming required on other drives. However, for most applications no
adjustments are necessary. For more advanced programming, PC based Drive-Link™ software is available.
Main features include adjustable RMS Current Limit and I2t Motor Overload Protection.1In addition, Adjustable Slip Compensation with
Static Auto-Tune and Boost provides high torque and excellent load regulation over a wide speed range. Power Start™ delivers over
200% motor torque to ensure startup of high frictional loads. Electronic Inrush Current Limit (EICL™) eliminates harmful AC line inrush
current.2The drive is suitable for machine or variable torque (HVAC) applications. With optional Drive-Link™ software, the drive can be
programmed for DC Injection Braking.
For AC line and motor wiring, quick-connect terminals are provided. Other features include: adjustable trimpots (MIN, MAX, ACC,
DEC/B3, COMP CL), customer selectable jumpers (Line Voltage (dual voltage models only), Automatic-Manual Start, Motor Frequency,
Frequency Multiplier, Forward/Reverse). Diagnostic LEDs are provided for power (PWR) and drive status (ST). A 5 k
<
Main Speed
Potentiometer is also included.
A Signal Isolator is optional on all models, which can be used for single-ended or bidirectional speed control and accepts voltage or
current signal input. Other optional accessories include: Class "A" and "B" AC Line Filters, Dynamic Brake Module, Multi-Speed Board,
Programming Kit, and Modbus Communication Module. A connector is provided for easy installation of accessories.
Notes: 1. UL approved as an electronic overload protector for motors. 2. Models KBVF-21D, 22D contain ICL in lieu of EICL™. 3. In 50 Hz Mode, the DEC/B
Trimpot automatically becomes Adjustable Boost.
3.1 Standard Features
=
Simple to Operate: Does not require programming. Uses trimpots and jumpers, which are factory set for most applications.
=
Diagnostic LEDs: Power on (PWR) and drive status (ST). See Section 12, on page XX.
=
Jumper Selection of Drive Output Frequency: Increases the motor speed up to two times the rated RPM. See Section 6, on
page XX.
=
Compatible with GFCIs (optional software required).
=
Industry Standard Mounting. See Section 7, on page XX.
=
Finger-Safe Cover: Meets IP-20 standard. See Section 5, on page XX.
3.2 Performance Features
=
Power Start™: Provides more than 200% starting torque which ensures startup of high frictional loads.
=
Slip Compensation with Static Auto-Tune and Boost: Provides excellent load regulation over a wide speed range.
=
Speed Range: 60:1
3.3 Protection Features
=
Motor Overload (I2t) with RMS Current Limit: Provides motor overload protection which prevents motor burnout and eliminates
nuisance trips. UL approved as an electronic overload protector for motors. See Section 4.2, on page, XX and Section 13.7, on
page XX.
=
Electronic Inrush Current Limit (EICL™): Eliminates harmful inrush AC line current during startup. Models KBVF-21D, 22D
contain ICL in lieu of EICL™.
=
Short Circuit: Prevents drive failure if a short circuit occurs at the motor (phase-to-phase).
=
Motor Filter: Reduces harmful voltage spikes to the motor.
=
Regeneration: Eliminates nuisance tripping due to bus overvoltage caused by rapid deceleration of high inertial loads.
=
Undervoltage and Overvoltage: Shuts down the drive if the AC line input voltage goes above or below the operating range.
=
MOV Input Transient Suppression.
=
Microcontroller Self Monitoring and Auto-Reboot.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
!"#"$&%$'()*,+.-/01&%$'(324(5"
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(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 6 of 20
3.4 Trimpot Adjustments
<
Minimum Speed (MIN): Sets the minimum speed of the motor. See Section 13.1, on page XX.
<
Maximum Speed (MAX): Sets the maximum speed of the motor. See Section 13.2, on page XX.
<
Acceleration (ACC): Sets the amount of time for the motor to accelerate from zero speed to full speed. See Section 13.3, on
page XX.
<
Deceleration (DEC/B): Sets the amount of time for the motor to decelerate from full speed to zero speed. See Section 13.4, on
page XX.
<
Slip Compensation (COMP): Maintains set motor speed under varying loads. See Section 13.5, on page XX.
<
Boost (DEC/B): In 50 Hz mode, the trimpot automatically becomes Adjustable Boost, which can be used to set the Volts/Hz
Curve for 50 Hz motors to obtain maximum performance. In 50 Hz Mode, the deceleration time is automatically set to the same
as the acceleration time. See Section 13.6, on page XX.
<
Current Limit (CL): Sets the current limit (overload) which limits the maximum current (torque) to the motor. See Section 13.7,
on page XX.
3.5 Optional Accessories
<
SIVFR - Signal Isolator and Run/Fault Relay (Part No. 9597): Provides isolation between a non-isolated signal voltage
(0 to ±2.5 thru 0 to ±25 Volts DC) or current source (4 - 20 mA DC) and the drive. Can be used in single-ended or in bidirectional
mode. Run/Fault Relay Output Contacts are also provided, which can be used to turn on or off equipment or to signal a warning if
the drive is put into the Stop Mode or a fault has occurred. Mounts on the end of the drive.
<
DBVF - Dynamic Brake Module (Part No. 9598): Provides up to 25% continuous braking and 200% instantaneous braking
torque (maximum 1 HP (.75 kW)).
<
Multi-Speed Board (Part No. 9503): Provides multi-speed operation using external contacts or a PLC. Mounts on the end of the
drive.
<
Programming Kit (Part No. 9582): Includes DownLoad Module™ (DLM) handheld programming device which uploads and
downloads drive programs, PC to DLM serial communication cable, DLM to inverter communication cable, and PC Windows®
based Drive-Link™ communication software.
<
DIVF - Modbus Communication Module (Part No. 9568): Allows the drive to communicate with PLCs, PCs, and HMIs with
Modbus RTU protocol utilizing a serial communication cable. If a USB communication cable is required, purchase Part No.
19008.
<
RFI Filters and Chokes: Provide RFI and EMI Suppression. They comply with CE Council Directive 39/336/EEC relating to the
Class A Industrial Standard and Class B Residential Standard. See RFI Filters and Chokes Selection Guide Publication No. D-
321.
<
Custom Software: All models can be factory programmed for applications that require special switching, timing, and PLC
functions. Contact our Sales Department.
Table 1
Electrical Ratings
AC Line Input Drive Output
Net Wt.
Model Part No. Volts AC
(50/60 Hz) Phase (
=
)
Maximum
Current
(Amps AC)
Voltage
Range
(Volts AC)
Maximum
Continuous
Load Current
(RMS Amps/Phase)
Maximum
Horsepower
(HP (kW))
Fuse or
Circuit Breaker
Rating
(Amps) lbs kg
115
1
4.0
KBVF-21D 9581 208/230 1 2.5 0-230 1.0 1/10 (.07) 5 0.7 0.3
115 1 6.0 10
KBVF-22D 9572 208/230 1 3.8 0-230 1.5 ¼ (.18) 51.3 0.6
KBVF-13 9957 115 1 11.0 0-230 2.4 ½ (.37) 15 1.3 0.6
KBVF-23 9958 208/230 1 7.0 0-230 2.4 ½ (.37) 10 1.3 0.6
115 1 11.0 15
KBVF-23D 9959 208/230 1 7.0 0-230 2.4 ½ (.37) 10 1.3 0.6
KBVF-14 9977 115 1 16.0 0-230 4.0 1 (.75) 20 2.2 1.0
KBVF-24 9978 208/230 1 10.0 0-230 4.0 1 (.75) 15 2.2 1.0
115 1 16.0 20
KBVF-24D 9979 208/230 1 10.0 0-230 4.0 1 (.75) 15 2.2 1.0
115 1 22.0 25
KBVF-26D* 9496 208/230 1 14.0 0-230 5.5 1½(1.13) 15 2.9 1.3
*Model KBVF-26D is rated 2 HP (1.5 kW) for most premium efficiency motors.
Note: All models contain Motor Filter and Quick-Connect Terminals for AC line and motor wiring. The Signal Isolator and
Run/Fault Relay is optional on all models.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]



(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 7 of 20
Table 2
General Performance Specifications
Description Specification Factory Setting
115 Volt AC Line Input Voltage Operating Range (Volts AC) 115 (±15%) —
208/230 Volt AC Line Input Voltage Operating Range (Volts AC) 208 (-15%) / 230 (+15%) —
Maximum Load (% Current Overload for 2 Minutes) 150 —
Carrier, Switching Frequency (kHz) 16, 8 —
Signal Following Input Voltage Range1(Volts DC) 0 - 5 —
Output Frequency Resolution (Bits, Hz) 10, .06 —
Minimum Speed Trimpot (MIN) Range (% Frequency Setting) 0 - 40 0
Maximum Speed Trimpot (MAX) Range (% Frequency Setting) 70 - 110 100
Acceleration Trimpot (ACC) and Deceleration Trimpot (DEC/B) Range (Seconds) .3 - 20 1.5
Boost Trimpot (DEC/B) Range (50 Hz Only) (Volts/Hz) 0 - 30 5
Slip Compensation Trimpot (COMP) Range at Drive Rating (Volts/Hz) 0 - 3 1.5
KBVF-21D .65 - 1.8 1.6
KBVF-22D 1.0 - 2.8 2.4
KBVF-13, 23, 23D 1.5 - 4.5 3.8
KBVF-14, 24, 24D 2.5 - 7.5 6.4
Current Limit Trimpot (CL) Range (Amps AC)
KBVF-26D 3.5 - 10.5 8.8
Motor Frequency Setting (Hz) (Jumper J1) 50, 60 60
Output Frequency Multiplier (X1, X2) (Jumper J2)21, 2 1
Minimum Operating Frequency at Motor (Hz) 1 —
Speed Range (Ratio) 60:1 —
Speed Regulation (30:1 Speed Range, 0 - Full Load) (% Base Speed)32.5 —
Overload Protector Trip Time for Stalled Motor (Seconds) 6 —
AC Line Input Undervoltage/Overvoltage Trip Points for 115 Volt AC Line (±5%) (Volts AC)476 - 141 —
AC Line Input Undervoltage/Overvoltage Trip Points for 208/230 Volt AC Line (±5%) (Volts AC)4151 - 282 —
Operating Temperature Range (°C) 0 - 45 —
Notes: 1. If a non-isolated signal is used, install the SIVFR - Signal Isolator (Part No. 9597). 2. Allows the motor to operate up to two times the rated RPM.
Constant horsepower will result when operating the drive in the "X2" mode. 3. Dependent on motor performance. 4. Do not operate the drive outside the specified
AC line input voltage operating range.
Figure 2
Models KBVF-21D, 22D, 13, 23, 23D Mechanical Specifications and Control Layout (Inches/mm)
(Model KBVF-22D Shown)
(See Figure 4, On Page XX, for Expanded View of Jumpers and Trimpots)
109
96.5
3.80
31.8
1.25
4.30
12.7
0.5
0.25
6.4
5.1
0.2
76.2
3.00
3.90
99.0

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]



(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 8 of 20
Figure 3
Models KBVF-14, 24, 24D, 26D Mechanical Specifications (Inches/mm)
(Model KBVF-26D Shown with Finger-Safe Cover Installed)
(See Figure 4, On Page XX, for Expanded View of Jumpers and Trimpots)
99.0
3.90
0.2
5.1
112
4.40
127
5.00
10.2 2.0
3.07
77.9 3.82
97.0
1.32
33.5
4.30
109 145
5.70
4.70
119
0.4 0.08
5.70
145
Figure 4
Expanded View of Jumpers and Trimpots
4 IMPORTANT APPLICATION INFORMATION
4.1 Motor with External Fan Cooling: Most totally enclosed fan-cooled (TEFC) and open ventilated 3-phase AC induction motors will
overheat if used beyond a limited speed range at full torque. Therefore, it is necessary to reduce motor load as speed is decreased.
Note: Some fan-cooled motors can be used over a wider speed range. Consult the motor manufacturer for details.
WARNING! Some motors have low speed characteristics which cause overheating and winding failure under light load or no
load conditions. If the motor is operated in this manner for an extended period of time, it is recommended that the unloaded motor
current be checked from 2-15 Hz (60-450 RPM) to ensure motor current does not exceed the nameplate rating. Do not use motor
if the motor current exceeds the nameplate rating.
It is recommended that the drive be used with Inverter Duty or TENV motors.
Inverter duty and most totally enclosed non-ventilated (TENV) motors can provide full rated torque over an extended speed range
without overheating. See Figure 5, on page XX.
If external fan cooling is provided, open ventilated motors can also achieve an extended speed range at full rated torque. A box fan
or blower with a minimum of 100 CFM is recommended. Mount the fan or blower so the motor is surrounded by the airflow. See
Figure 6, on page XX.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]



(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 9 of 20
Figure 5
Maximum Allowed Motor Torque vs. Speed Figure 6 Open Ventilated Motor with External Cooling
TEFC and Open Ventilated Motors
Fan Cooled
and TENV Motors
Inverter Duty
4.2 Electronic Motor Overload Protection: The drive contains Modified I2t Overload Protection.*Part of this function consists of a
Current Limit (CL) circuit, which limits the drive current to a factory preset level of 160% of the rated drive current. The CL Trimpot
is used to recalibrate the drive current from 60% thru 200%. The Power Start™ circuit provides an overshoot function that allows
most motors to develop more than 200% of starting torque and breakdown torque.
Standard I2t is undesirable because it causes nuisance tripping. It allows a very high motor current to develop and will turn the drive
off after a short period of time. KB's RMS Current Limit Circuit avoids this nuisance tripping while providing maximum motor
protection.
If the motor is overloaded to 120% of full load (75% of the CL setting), the I2t Timer starts. If the motor continues to be overloaded
at the 120% level, the timer will shut down the drive after 30 minutes. If the motor is overloaded to 160% of full load, the drive will
trip in 6 seconds.
*UL approved as an overload protector for motors.
5 FINGER-SAFE COVER
The drive is designed with an IP-20 Finger-Safe Cover which provides protection against accidental contact with high voltage.
WARNING! Disconnect main power when removing or installing the Finger-Safe Cover.
WARNING! To prevent accidental contact with high voltage, it is required that the Finger-Safe Cover be properly installed
onto the drive after all wiring and setup is complete. It offers protection against electric shock which limits the potential liability
to the equipment manufacturer and installer.
5.1 Removing the Finger-Safe Cover: The Finger-Safe Cover may have to be removed before wiring the drive or setting selectable
jumpers. All trimpots can be readjusted with the Finger-Safe Cover installed. Notice the orientation of the Finger-Safe Cover before
removing it.
Note: The Finger-Safe Cover (except that of the KBVF-21D) is designed with a removable panel (on the trimpots side) which must be removed for
installation of optional accessories SIVFR Signal Isolator and Run/Fault Relay (Part No. 9597) or Multi-Speed Board (Part No. 9503). Complete
instructions are provided with the accessories.
Model KBVF-21D: Designed with three "push-ins" (instead of retainer clips) located where the Finger-Safe Cover aligns with the
base. To remove the cover, gently press at the three push-ins until the cover disengages from the base.
Models KBVF-22D, 13, 23, 23D, 14, 24, 24D, 26D: To remove the Finger-Safe Cover, gently lift up on the four retainer clips until
the cover disengages from the base. See Figures 2 and 3, on pages XX-XX.
Note: On Model KBVF-26D, the inner bus capacitor support bracket should not be removed.
5.2 Installing the Finger-Safe Cover: To install the Finger-Safe Cover, be sure to properly align the retainer clips or push-ins. Gently
push the Finger-Safe Cover onto the base until the retainer clips or push-ins are fully engaged with the base.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]



(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 10 of 20
6 SETTING SELECTABLE JUMPERS
The drive has customer selectable jumpers which must be set before the drive can be used. For the location of jumpers, see Figure 4, on
page XX.
6.1 AC Line Input Voltage Selection (Jumper J1 (Models KBVF-21D, 22D, 23D, 24D, 26D* Only)): Jumper J1 is factory set to the
"230V" position for 208/230 Volt AC line input. For 115 Volt AC line input, set Jumper J1 to the "115V" position. Jumper J1 is
located on the upper PC board. See Figures 7 and 8, on page XX.
For 115 Volt AC line input, on Model KBVF-26D, the jumper must be removed and installed onto the "115VAC" position. Using
pliers, gently rock the female terminal back and forth vertically while pulling it upward. See Figure 9, on page XX.
* Note: On Model KBVF-26D, Jumper J1 is labeled "115VAC" and "230VAC".
Figure 7
Models KBVF-21D, 22D, 23D, 24D
AC Line Input Voltage Selection
230 Volt AC Line Input
(Factory Setting)
(J1 Installed in "230V" Position) 115 Volt AC Line Input (J1 Installed in "115V" Position)
Figure 8
Model KBVF-26D
AC Line Input Voltage Selection
Figure 9
Removing Jumper J1
on Model KBVF-26D
230 Volt AC Line Input
(Factory Setting)
(J1 Installed in "230VAC" Position) 115 Volt AC Line Input
(J1 Installed in "115VAC" Position)
6.2 60Hz and 50 Hz Motor Operation and Drive Output Frequency Selection (Jumpers J1 and J2): Both jumpers must be set for
the appropriate motor nameplate frequency rating. Jumpers J1 and J2 are located on the lower PC board.
6.2.1 Setting the Drive for 60 Hz or 50 Hz Motor Operation: The drive is factory set to operate 60 Hz motors. Jumper J1 is
factory set to the "60Hz" position and Jumper J2 is factory set to the "X1" position. For 50 Hz motors, set Jumper J1 to the
"50Hz" position, and be sure Jumper J2 is set to the "X1" position. Jumpers J1 and J2 are located on the lower PC board.
See Figure 10, on page XX.
Figure 10
60 Hz and 50 Hz Motor Selection
60 Hz Motor Operation
(Factory Setting)
(J1 Installed in "60Hz" Position)
(J2 Installed in "X1" Position)
50 Hz Motor Operation
(J1 Installed in "50Hz" Position)
(J2 Installed in "X1" Position)
6.2.2 Setting the Drive for Two Times the Rated Motor RPM: The drive can also be used to operate the motor up to two times
the rated RPM. However, constant horsepower will result when operating the drive in the "X2" mode. See Figure 11, on
page XX.
For 120 Hz output with 60 Hz motor, be sure Jumper J1 is set to the "60Hz" position and set Jumper J2 to the "X2" position.
For 100 Hz output with 50 Hz motor, set Jumper J1 to the "50Hz" position and set Jumper J2 to the "X2" position. See
Figure 12, on page XX.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 11 of 20
Figure 11
Available Torque vs. Output Frequency Figure 12 120 Hz and 100 Hz Drive Output Frequency Selection
120 Hz Output with 60 Hz Motor
(J1 Installed in "60Hz" Position)
(J2 Installed in "X2" Position)
100 Hz Output with 50 Hz Motor
(J1 Installed in "50Hz" Position)
(J2 Installed in "X2" Position)
6.3 Automatic Start (CON1): The drive is factory set for Automatic Start (jumper installed onto CON1), as shown in Figure 13, on page
XX. CON1 is located on the lower PC board. The drive will automatically start when power is applied and a run command is given.
The drive will automatically restart after a recovered fault due to undervoltage, overvoltage, or short circuit.
For an I2t Trip, due to a prolonged overload, the drive must be manually restarted. See Section 11.2, on page XX. Also see Section
12.2, on page XX.
For Manual Start, a momentary contact must be installed onto CON1, as described in Section 9.6, on page XX.
Figure 13
Automatic Start
(Jumper Installed)
6.4 Forward/Reverse Speed Selection (CON2): The drive is factory set for Forward Speed Operation (jumper installed in the "F"
position of CON2). CON2 is located on the lower PC board. For reverse Speed Operation, install the jumper in the "R" position.
See Figure 14, on page XX.
To wire a Forward-Stop-Reverse Switch, see Section 9.7, on page XX.
Figure 14
Forward/Reverse Speed Selection
Forward Speed Operation
(Factory Setting)
(Jumper Installed in "F" Position) Reverse Speed Operation (Jumper Installed in "R" Position)
7 MOUNTING INSTRUCTIONS
WARNING! The drive is not designed to be used in an explosion-proof application.
It is recommended that the drive be mounted on a flat surface with adequate ventilation. When mounting the drive in an enclosure, the
enclosure should be large enough to allow for proper heat dissipation so that the ambient temperature does not exceed 45 °C (113 °F).
Leave enough room to allow for AC line, motor connection, and other wiring that is required. See Figures 2 and 3, on pages XX-XX.
When mounting the Main Speed Potentiometer, be sure to install the insulating disc between the potentiometer and the panel.
WARNING! Care should be taken to avoid extreme hazardous locations where physical damage can occur due to
moisture, metal chips, dust, and other contamination, including corrosive atmosphere that may be harmful. See Safety Warning,
on page XX. To prevent accidental contact with high voltage, it is required that the Finger-Safe Cover be properly installed onto
the drive after all wiring and setup is complete.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 12 of 20
8 RECOMMENDED HIGH VOLTAGE DIELECTRIC WITHSTAND TESTING (Hi-Pot Testing)
Testing agencies such as UL, CSA, etc., usually require that equipment undergo a hi-pot test. In order to prevent catastrophic damage to
the drive, which has been installed in the equipment, the following procedure is recommended. A typical hi-pot test setup is shown in
Figure 15, on page XX. All drives have been factory hi-pot tested in accordance with UL requirements.
Warning! All equipment AC line inputs must be disconnected from the AC power.
8.1 Connect all equipment AC power input lines together and connect them to the H.V. lead of the Hi-Pot Tester. Connect the RETURN
of the Hi-Pot Tester to the frame on which the drive and other auxiliary equipment are mounted.
8.2 The Hi-Pot Tester must have an automatic ramp-up to the test voltage and an automatic ramp-down to zero voltage.
Note: If the Hi-Pot Tester does not have automatic ramping, then the hi-pot output must be manually increased to the test voltage and then manually
reduced to zero. This procedure must be followed for each machine being tested. A suggested Hi-Pot Tester is Slaughter Model 2550.
CAUTION! Instantly applying the hi-pot voltage will cause irreversible damage to the drive, which will void the warranty.
Figure 15
Typical Hi-Pot Setup
TEST VOLTAGERETURN
RESETH. V.
ZERO MAX
LEAKAGE
0mA 10mA
9 WIRING INSTRUCTIONS
WARNING! Read Safety Warning, on page XX, before using the drive. Disconnect main power when making connections
to the drive. To avoid electric shock, be sure to properly ground the drive.
Application Note: To avoid erratic operation, do not bundle the AC line and motor wires with wires from signal following , start/stop
contacts, or any other signal wires. Also, do not bundle motor wires from multiple drives in the same conduit. Use shielded cables on all
signal wiring over 12" (30 cm). The shield should be earth grounded on the drive side only. Wire the drive in accordance with the National
Electrical Code requirements and other local codes that may apply.
Be sure to properly fuse each AC line conductor that is not at ground potential. Do not fuse neutral or grounded conductors. A
separate AC line switch or contactor must be wired as a disconnect so that each ungrounded conductor is opened. For fuse or circuit
breaker selection, see Section 10, on page XX.
9.1 AC Line Connection: Wire the single-phase AC line input to Terminals "L1" and "L2". The terminals are located on the upper PC
board. See Figure 16, on page XX.
Note: The rated AC line voltage of the drive must match the actual AC line input voltage. On Models KBVF-21D, 22D, 23D, 24D, 26D, the setting of
Jumper J1 must match the AC line input voltage.
Models KBVF-13, 14: Rated for 115 Volt AC line input only.
Models KBVF-23, 24: Rated for 208/230 Volt AC line input only.
Models KBVF-21D, 22D, 23D, 24D, 26D*: Rated for 208/230 Volt AC line input with Jumper J1 set to the "230V" position (factory
setting). Rated for 115 Volt AC line input with Jumper J1 set to the "115V" position . Jumper J1 is located on the upper PC board.
* Note: On Model KBVF-26D, Jumper J1 is labeled "115VAC" and "230VAC".

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]



(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 13 of 20
Figure 16
AC Line Input, Motor, and Ground Connections
9.2 Ground Connection: Connect the ground wire (earth) to the green ground screw. The ground screw is located on the heat sink.
See Figure 16, on page XX.
Note: Model KBVF-21D, due to its double insulated design, does not contain a ground screw.
9.3 Motor Connection: Wire the motor to Terminals "U", "V", "W". The terminals are located on the upper PC board. See Figure 16,
on page XX. Motor cable length should not exceed 100 ft (30 m) – special reactors may be required – consult our Sales
Department.
Note: The drive is programmed to operate 3-phase AC induction motors. For PSC motors, optional software is required – contact our Sales
Department.
9.4 Main Speed Potentiometer Connection: The drive is supplied with a 5 k

Main Speed Potentiometer to control motor speed.
Wire the Main Speed Potentiometer to Terminals "P1" (low), "P2" (wiper), "P3" (high). The terminals are located on the lower PC
board. See Figure 17, on page XX.
WARNING! Do not earth ground any Main Speed Potentiometer terminals.
Figure 17
Main Speed Potentiometer Connection
Note: When mounting the Main Speed Potentiometer, be sure to
install the insulating disc (supplied)between the potentiometer and
the panel.
9.5 Voltage Following Connection: An isolated* 0 - 5 Volt DC analog signal input can be used to control motor speed in lieu of the
Main Speed Potentiometer. The drive output will linearly follow the analog signal input. Connect the signal input positive lead (+) to
Terminal "P2" and the negative lead (-) to Terminal "P1". The terminals are located on the lower PC board. With external circuitry,
a 0 - 10 Volt DC analog signal can also be used. See Figure 18, on page XX.
*If a non-isolated signal is used, install the SIVFR - Signal Isolator (Part No. 9597). The SIVFR accepts voltage (0 to ±2.5 thru 0 to ±25 Volts DC) or
current (4 - 20 mA DC) signal inputs. See Section 3.5, on page XX.
Note: For signal following operation, the Minimum Speed Trimpot (MIN) must be set fully counterclockwise.
WARNING! The signal input must be isolated from the AC line. Earth grounding signal wiring will damage the drive
and void the warranty. It is recommended that the SIVFR - Signal Isolator and Run/Fault Relay (Part No. 9597) be installed
when using signal following.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 14 of 20
Figure 18
Voltage Following Connection
0 - 5 Volts DC (Isolated) 0 - 10 Volts DC (Isolated)
++
9.6 Manual Start Switch Connection (CON1): The Manual Start Mode is used to manually start the drive or restart the drive (reset) if a
fault has occurred. To operate the drive in the Manual Start Mode, remove the factory installed jumper on CON1 and install the 2-
wire connector (supplied). CON1 is located on the lower PC board. The connector must be wired to a momentary switch or contact,
as shown in Figure 19, on page XX.
In the Manual Start Mode, the drive will trip due to all faults (Overvoltage, Undervoltage, Short Circuit, and I2t) and remain tripped
even when the fault is cleared. To Start/Reset the drive, the switch or contact must be manually closed. Also, the drive must be
restarted each time the AC line is interrupted.
For Automatic Start, see Section 6.3, on page XX.
Notes: 1. See Section 11.2, on page XX. Also see Section 12.2, on page XX. 2. The drive can be factory programmed for Run/Stop operation with
momentary contacts.
Figure 19
Manual Start Switch Connection
Jumper Removed Connector Installed for Manual Start Switch
9.7 Forward-Stop-Reverse Switch Connection (CON2): To operate the drive using a Forward-Stop-Reverse Switch, remove the
factory installed jumper on CON2 and install the 3-wire connector (supplied). CON2 is located on the lower PC board. The
connector must be wired to a "maintained" switch or contact. See Figure 20, on page XX. Also see Forward/Reverse Speed
Selection, in Section 6.4, on page XX.
Note: The drive can be factory programmed for momentary contact operation.
Figure 20
Forward-Stop-Reverse Switch Connection
Jumper Removed Connector Installed for Forward-Stop-Reverse Switch
9.8 Enable Switch Connection (CON2): The drive can be started and stopped with an Enable Switch (close to run, open to stop).
Remove the factory installed jumper on CON2 and install the 3-wire connector (supplied). CON2 is located on the lower PC board.
The connector must be wired to a "maintained" switch or contact. See Figure 21, on page XX.
For Forward Enable Operation, wire the switch to the white and black wires. For Reverse Enable Operation, wire the switch to
the red and black wires. When the switch is closed, the drive will run. When the switch is opened, the drive will stop.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 15 of 20
Figure 21
Enable Switch Connection
Jumper Removed Connector Installed for Forward Enable Switch Connector Installed for Reverse Enable Switch
*For Forward Enable Switch connection, the red wire is not used. For Reverse Enable Switch connection, the
white wire is not used. The unused wire must be insulated or it may be cut off at the connector.
10 AC LINE FUSING
This drive does not contain AC line fuses. Most electrical codes require that each ungrounded conductor contain circuit protection.
Do not fuse neutral or ground connections. It is recommended to install a fuse (Littelfuse 326, Buss ABC, or equivalent) or a circuit
breaker in series with each ungrounded conductor. Wire the drive in accordance with the National Electrical Code requirements and other
local codes that may apply to the application. Do not fuse motor leads. For the recommended fuse size, see Table 1, on page XX.
11 DRIVE OPERATION
11.1 Start-Up Procedure: After the drive has been properly setup (jumpers and trimpots set to the desired positions) and wiring
completed, the startup procedure can begin. If the AC power has been properly brought to the drive, the power (PWR) LED will be
illuminated green. The status (ST) LED will indicate drive status, as described in Section 11.2, on page XX. To remove and install
the Finger-Safe Cover, see Section 5, on page XX.
11.2 Fault Recovery: The drive monitors for four faults (Undervoltage, Overvoltage, Short Circuit at the motor (phase-to-phase), I2t).
Table 3, on page XX, describes how the drive will automatically start (factory setting) after the fault has cleared.
Application Note: In Manual Start Mode, the drive must be manually reset for any fault. Use the Manual Start Switch, as
described in Section 9.6, on page XX. Also see Section 12.2, on page XX.
Table 3
Fault Recovery and Resetting the Drive*
Fault Automatic Start Mode (Factory Setting)
Undervoltage Drive will automatically start after the bus voltage returns to the operational level
or when the drive is first turned on (power up).
Overvoltage Drive will automatically start
after the bus voltage returns to the operational level.
Short Circuit Drive will automatically start
after the short circuit is removed.
I2tDrive must be manually restarted.
See Section 11.2.1, on page XX.
*The fault must be cleared before the drive can be reset.
11.3 Restarting the Drive After an I2t Fault Has Cleared: The drive can be restarted after an I2t Fault has cleared by any of the
following methods.
Note: If an I2t Fault occurs, the motor may be overloaded. Check the motor current with an AC RMS responding ammeter. Also, the CL setting may
be set too low. See Section 13.7, on page XX.
1Disconnect and reconnect the AC power (approximately 15 seconds). The "ST" LED must change from quick flashing red to
flashing red/yellow.
2Setting the Main Speed Potentiometer to zero (fully counterclockwise).
Note: In order to be able to reset the drive by setting the Main Speed Potentiometer to zero, it is necessary to have the MIN Trimpot set to zero
(fully counterclockwise).
3Use the Enable switch or contact. See Section 9.8, on page XX.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 16 of 20
12 DIAGNOSTIC LEDs
The drive contains two diagnostic LEDs to display the drive's operational status. See Figure 4, on page XX, for the location of the "PWR"
and "ST" LEDs.
12.1 Power On (PWR): The "PWR" LED will illuminate green when the AC line is applied to the drive.
12.2 Status LED (ST): The "ST" LED is a tricolor LED which provides indication of a fault or an abnormal condition. The information
provided can be used to diagnose an installation problem such as incorrect input voltage, overload condition, and drive output
miswiring. It also provides a signal which informs the user that all drive and microcontroller operating parameters are normal. Table
4, on page XX, summarizes the "ST" LED functions.
Note: The drive is factory set to the Automatic Start Mode. For Manual Start/Rest, see Section 9.6, on page XX.
Table 4
Drive Operating Condition and Status LED Indicator
Drive Operating Condition Flash Rate1and LED Color
Normal Operation Slow Flash Green
Overload
(120% - 160% Full Load) Steady Red2
I2t
(Drive Timed Out) Quick Flash Red2
Short Circuit Slow Flash: Red
Undervoltage Quick Flash Red / Yellow3
Overvoltage Slow Flash Red / Yellow3
Stop Steady Yellow
Notes: 1. Slow Flash = 1 second on and 1 second off. Quick
Flash = 0.25 second on and 0.25 second off. 2. In Manual Start
Mode, when the Overload is removed, before the I
2
t times out
and trips the drive, the “ST” LED will flash green. 3. In Manual
Start Mode, when the Undervoltage or Overvoltage condition is
corrected, the “ST” LED will flash Red / Yellow / Green.
13 TRIMPOT ADJUSTMENTS
The drive contains trimpots which are factory set for most applications. See Figure 4, on page XX, for the location of the trimpots and their
approximate factory calibrated positions. Some applications may require readjustment of the trimpots in order to tailor the drive for a
specific requirement. The trimpots may be readjusted as described below.
WARNING! If possible, do not adjust trimpots with the main power applied. If adjustments are made with the main
power applied, an insulated adjustment tool must be used and safety glasses must be worn. High voltage exists in this drive.
Fire and/or electrocution can result if caution is not exercised. Safety Warning, on page XX, must be read and understood
before proceeding.
13.1 Minimum Speed (MIN): Sets the minimum speed of the motor. The MIN Trimpot is factory set to 0% of frequency setting. For a
higher minimum speed setting, rotate the MIN Trimpot clockwise. See Figure 22, on page XX.
Figure 22
Minimum Speed Trimpot (MIN) Range
13.2 Maximum Speed (MAX): Sets the maximum speed of the motor. The MAX Trimpot is factory set to 100% of frequency setting. For
a higher maximum speed setting, rotate the MAX Trimpot clockwise. For a lower maximum speed setting, rotate the MAX Trimpot
counterclockwise. See Figure 23, on page XX.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 17 of 20
Figure 23
Maximum Speed Trimpot (MAX) Range
13.3 Acceleration (ACC): Sets the amount of time for the motor to accelerate from zero speed to full speed. The ACC Trimpot is factory
set to 1.5 seconds. For longer acceleration time, rotate the ACC Trimpot clockwise. For more rapid acceleration, rotate the ACC
Trimpot counterclockwise. See Figure 24, on page XX.
Note: Rapid acceleration settings may cause the current limit circuit to activate, which will extend the acceleration time.
Figure 24
Acceleration Trimpot (ACC) Range
13.4 Deceleration (DEC/B): Sets the amount of time for the motor to decelerate from full speed to zero speed. The DEC/B Trimpot is
factory set to 1.5 seconds. For longer deceleration time, rotate the DEC/B Trimpot clockwise. For more rapid deceleration, rotate
the DEC/B Trimpot counterclockwise. See Figure 25, on page XX.
Application Note: On applications with high inertial loads, the deceleration may automatically increase in time. This will slow down
the rate of speed of decrease to prevent the bus voltage from rising to the Overvoltage Trip point. This function is called
Regeneration Protection. It is recommended that for very high inertial loads that both the ACC and DEC/B Trimpots should
be set to greater than 10 seconds.
For rapid stopping, install the optional DBVF - Dynamic Brake Module (Part No. 9598). See Section 3.5, on page XX.
Figure 25
Deceleration Trimpot (DEC/B) Range
13.5 Slip Compensation (COMP): Sets the amount of Volts/Hz to maintain set motor speed under varying loads. The COMP Trimpot is
factory set to 1.5 Volts/Hz, which provides excellent speed regulation for most motors. To increase the slip compensation, rotate the
COMP Trimpot clockwise. To decrease the slip compensation, rotate the COMP Trimpot counterclockwise. See Figure 26, on page
XX.
The slip compensation may be adjusted as follows:
1. Wire an AC ammeter in series with one motor phase.
2. Run the motor and set the unloaded speed to approximately 50% (900 RPM on 4-pole 1500/1725 RPM motors).
3. Using a tachometer, record the unloaded speed.
4. Load the motor to the nameplate rated current (AC Amps).
5. Adjust the COMP Trimpot until the loaded RPM is equal to the unloaded RPM.
6. The motor is now compensated to provide constant speed under varying loads.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 18 of 20
Figure 26
Slip Compensation Trimpot (COMP) Range
13.6 Boost (DEC/B): When the drive is set for 50 Hz Motor Operation (Jumper J1 installed in the "50Hz" position), the DEC/B Trimpot
automatically becomes the adjustable BOOST Trimpot.
Most 60 Hz motors conforming to NEMA standards can operate from a preset Volts/Hz curve. 50 Hz motors, however, generally
differ widely in their characteristics. Therefore, it is necessary to have adjustable Boost to obtain maximum motor performance.
To increase the boost, rotate the BOOST Trimpot clockwise. To decrease the boost, rotate the BOOST Trimpot counterclockwise.
See Figure 27, on page XX.
In order for the 50 Hz motor to run properly, the boost must be adjusted. If the application does not require full torque below 10 Hz,
the Boost (DEC/B) Trimpot can be conservatively set at 8% (9 o'clock position).
Note: In 50 Hz motor operation, the deceleration time is automatically set to the same as the Acceleration Trimpot (ACC) setting.
WARNING! To avoid motor winding heating and failure, do not overboost the motor.
The Boost (DEC/B)Trimpot may be adjusted as follows:
1. Wire an AC analog RMS ammeter in series with one motor phase. (Generally, digital or clamp-on meters do not provide
accurate readings.)
2. Run the motor unloaded at approximately 4 Hz (or 120 RPM).
Note: An unloaded motor with excessive boost will draw more current than a partially loaded motor.
3. Increase the boost until the ammeter reaches the nameplate rated current (AC Amps).
4. Using the Main Speed Potentiometer, slowly adjust the motor speed over a 0-15 Hz (0-450 RPM) range. If the motor current
exceeds the nameplate rating, decrease the boost setting.
Figure 27
Boost Trimpot (DEC/B) Range
13.7 Motor Overload (I2t) with RMS Current Limit (CL)*: Sets the current limit (overload), which limits the maximum current to the
motor, prevents motor burnout, and eliminates nuisance trips. The CL Trimpot is factory set to 160% of the drive rating. To
increase the current limit, rotate the CL Trimpot clockwise. To decrease the current limit, rotate the CL Trimpot counterclockwise.
See Figures 28 - 32, on pages XX - XX.
*UL approved as an electronic overload protector for motors.
In order to ensure that the motor is properly protected with the I2t feature, it is required that the CL Trimpot be set for 160%
of the motor nameplate rating. This is accomplished as follows:
Note: This adjustment must be made within 6 seconds or the I2t Trip will occur.
1. Connect an AC ammeter in series with one motor phase.
2. Set the CL Trimpot fully counterclockwise.
3. Adjust the speed setting to 30% of full speed.
4. Lock the motor shaft and adjust the CL Trimpot to 160% of the motor nameplate rating.
Example: A ½ HP motor has a full load current rating of 1.8 Amps. Set the CL Trimpot to 1.8 X 160% = 2.9 Amps.

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 19 of 20
Figure 28
Model KBVF-21D
Current Limit Trimpot (CL) Range
Figure 29
Model KBVF-22D
Current Limit Trimpot (CL) Range
Figure 30
Models KBVF-13, 23, 23D
Current Limit Trimpot (CL) Range
Figure 31
Models KBVF-14, 24, 24D
Current Limit Trimpot (CL) Range
Figure 32
Model KBVF-26D
Current Limit Trimpot (CL) Range

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: [phone]; Fax: [phone]
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

(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 20 of 20
LIMITED WARRANTY
For a period of 18 months from the date of original purchase, KB Electronics,
Inc. will repair or replace without charge, devices which our examination proves
to be defective in material or workmanship. This warranty is valid if the unit has
not been tampered with by unauthorized persons, misused, abused, or
improperly installed and has been used in accordance with the instructions
and/or ratings supplied. The foregoing is in lieu of any other warranty or
guarantee, expressed or implied. KB Electronics, Inc. is not responsible for any
expense, including installation and removal, inconvenience, or consequential
damage, including injury to any person, caused by items of our manufacture or
sale. Some states do not allow certain exclusions or limitations found in this
warranty and therefore they may not apply to you. In any event, the total liability
of KB Electronics, Inc. under any circumstance, shall not exceed the full
purchase price of this product. (rev 2/2000)
COPYRIGHT © 2005 KB Electronics, Inc.
All rights reserved. In accordance with the United States Copyright Act of 1976,
no part of this publication may be reproduced in any form or by any means
without permission in writing from KB Electronics, Inc. (8/2002)