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.