KB Electronics KBPC-240D Configuration guide

“The Right Control for Your Application.” 12095 NW 39 Street, Coral Springs, FL 33065-2516
Telephone: [phone]; Fax: [phone]
KB Electronics, Inc. www.kbelectronics.com
KBPC-240D (Part Nos. 9338 and 9342) Installation and Operation Manual Supplement
(A42144) – Rev. D00 – 1/6/2010 Page 1 of 1
This supplement is for Model KBPC-240D Installation and Operation Manual (Part No. A40400) until the new manual is available. The manual
must be read and understood before operating this drive. For further assistance, contact our Sales Department at 954-346-4900 or Toll Free
at 800-221-6570 (outside Florida).
PRODUCT UPDATES
zRun Relay Added zSMT Construction
This drive has been converted to Surface Mount Technology (SMT). All trimpots have been moved and aligned at the top of the PC board.
A Run Relay has been added, which can be used to turn equipment "on" or "off" as a function of drive status (Off, Stop, Run). The General
Performance Specifications, Electrical Ratings, Mechanical Specifications, and Connection Diagrams have not changed. The Parts List (Table
11, on pages 17 and 18) and Schematic (Figure 16, on page 19) in the manual no longer apply to this drive and should not be used. See
Figure 1 for the location of the Run Relay Output Contacts, Trimpots, and Jumpers (replaces Figure 1, on page 3, in the manual). See Figure
1 for the Run Relay Output Contacts ratings. See Table 1 for the drive operating conditions and Run Relay Output Contacts status.
FIGURE 1 – DRIVE LAYOUT
TABLE 1 – DRIVE OPERATING CONDITION AND RUN RELAY OUTPUT CONTACTS STATUS
Drive Operating Condition Description Normally Open Contact Normally Closed Contact
Power Off Main Power Disconnected Open Closed
Run Mode Normal Drive Operation Closed Open
Stop Mode Selected by Operator Open Closed
Trip Drive Tripped Open Closed

See Page 2
Note: Product
illustration is
shown with
optional Forward-
Brake-Reverse
and Run-Jog
options.
This control will
not operate
without installing
the correct
armature fuse –
supplied
separately.
© 1998 KB Electronics, Inc.
INSTALLATION AND OPERATING INSTRUCTIONS
MODEL KBPC-240D
KB Part No. 9338 (Black Case) •Part No. 9342 (White Case)
NEMA 4X, IP-65
SCR Speed and Torque Control Designed
For DC Motors Rated
1/50 – 1 HP @ 90VDC, 1/25 – 2 HP @ 180VDC
T
See Safety Warning on Page 2
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
™

ii
TABLE OF CONTENTS
Section Page
i. KBPC-240D Simplified Operating Instructions ..................................1
ii. Safety Warning .........................................................2
I. General Information .....................................................2
II. Setting Selectable Jumpers ...............................................5
III. Mounting ..............................................................9
IV. Wiring ...............................................................10
V. Fusing ...............................................................13
VI. Operation ............................................................13
VII. Trimpot Adjustments ....................................................14
VIII. Function Indicator Lamps ................................................15
IX. Optional Accessories ...................................................15
X. Limited Warranty .......................................................22
TABLES
1. Electrical Ratings .......................................................5
2. General Performance Specifications .........................................5
3. Setting AC Line Voltage with Jumper J2A and J2B ..............................7
4. Setting Armature Voltage with Jumper J3 .....................................8
5. Jumper J4 vs Motor Horsepower ...........................................8
6. Current Limit Settings with .05 Ohm Plug-In-Horsepower Resistor Installed ...........8
7. Terminal Block Wiring Information .........................................10
8. Relationship of AC Line Input and Motor Voltage with J2 and J3 Jumper Position .....10
9. Field Connections (Shunt Wound Motors Only) ...............................11
10. Armature Fuse Chart ...................................................13
11. Parts List .........................................................17, 18
FIGURES
1. Control Layout .........................................................3
2. Mechanical Specifications .................................................4
3. Motor Speed vs Potentiometer Rotation ......................................6
4. Preset Motor Speed vs Motor Load ..........................................6
5. Motor Output Torque vs Potentiometer Rotation ................................7
6. Motor Speed vs Applied Motor Load .........................................7
7A. Captive Screw Tightened in Case ..........................................10
7B. Captive Screw Engaged in Front Cover .....................................10
8. Connection Diagram ....................................................10
9A. Full Voltage Field ......................................................11
9B. Half Voltage Field ......................................................11
10. Tach-generator Connection Diagram .......................................11
11. Remote Potentiometer ..................................................12
12. Analog Voltage ........................................................12
13. Remote Start/Stop Switch ................................................12
14. Inhibit Circuit ..........................................................12
15. Enable Circuit .........................................................13
16. Schematic ............................................................19
17. Connection Diagram for KBPC-240D with KBSI-240D Signal Isolator ...............20
18. Internal Connection Diagram ..............................................21
19. Connection Diagrams for Available Options ..................................21

1
i. KBPC-240D SIMPLIFIED OPERATING INSTRUCTIONS
IMPORTANT – You must read these simplified operating
instructions before you proceed. These instructions are to
be used as a reference only and are not intended to replace
the detailed instructions provided herein. You must read the
Safety Warning on page 2 before proceeding.
1. CONNECTIONS.
A. AC Line – Wire AC line voltage to terminals L1 and L2. Be sure jumpers J2A and J2B
are both set to the correct input line voltage 115 or 230 VAC. Connect ground wire
(earth) to green ground screw on case.
B. Motor.
1. Permanent Magnet (PM) Type. Connect motor armature leads to A1(+) and A2(–).
Be sure jumper J3 is set to the proper position “90V" for 90 volt DC motors and
“180V" for 180 volt DC motors. Note: 180 volt DC motors must be used with 230
VAC line, 90 volt motors can be used with a 230 VAC or 115 VAC line. See sec.
II, C, on page 7.
2. Shunt Wound Motors. Connect motor armature as above. Connect full voltage
shunt field wires (90 volt motors with 100 volt fields and 180 volt motors with 200
volt fields) to F1 and F2. Connect half voltage field wires (90 volt motors with 50
volt fields and 180 volt motors with 100 volt fields) to F1 and L1. See sec. IV, C,
on page 11.
2. SPEED OR TORQUE MODE.
Jumper J1 is factory set for speed control operation (SPD). For torque control, set J1 to
TRQ position. See sec. II, A, on page 5.
3. MOTOR CURRENT.
Jumper J4 is factory set for 10 amp motors (10A). For lower amperage motors, place J4
in the proper position. See section II, D, on page 8 for details. Note: The factory setting
for Current Limit is 150% of the nominal current setting, e.g., if J4 is selected for 10 amps,
the actual CL setting will be 15 amps.
4. TRIMPOT SETTINGS.
All trimpots have been factory set in accordance with figure 1, page 3 and table 1, page 5.
5. DIAGNOSTIC LED’s.
After power is turned on, observe LED’s to verify proper control function. See sec. VIII on
page 15.
6. ARMATURE FUSE.
The correct size armature fuse must be installed,depending on the rating of the motor.
Control will not operate if fuse is not installed. See section V, B on page 13 and table 6 on
page 12.
7. START/STOP SWITCH.
The KBPC contains a built-in manual start/stop switch. This switch must be used to start
the control each time AC power is lost. To override this function see sec IV, G, p. 12.

2
ii. SAFETY WARNING! — PLEASE READ CAREFULLY
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 wiring, mounting in proper enclosure, fusing or other overcurrent protection and grounding,
can reduce the chance of electric 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 control 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. If
information is required on this product, contact our factory. It is the responsibility of the equipment
manufacturer and individual installer to supply this safety warning to the ultimate user of this
product. (SW effective 11/92)
This control contains electronic Start/Stop and inhibit circuits that can be used to start and
stop the control. However, these circuits are never to be used as safety disconnects since they are
not fail-safe. Use only the AC line for this purpose.
The input circuits of this control (potentiometer, start/stop, Inhibit) are not isolated from AC
line. 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 factory for detailed installation instructions and Declaration of Conformity.
Installation of a CE approved RFI filter (KBRF-200A, KB P/N 9945A or equivalent) is required.
Additional shielded motor cable and/or AC line cables may be required along with a signal
isolator (KBSI-240D, KB P/N 9431 or equivalent).
I. GENERAL INFORMATION.
The KBPC Series Nema 4 X (IP-65) is a unidirectional SCR DC Motor Speed and Torque Control
designed for applications requiring watertight integrity, including washdown. Its housing is
ruggedly constructed of die cast aluminum, protected with an acrylic coating that provides
excellent corrosion resistance. All switches are sealed with rubber boots and the main speed
potentiometer contains a shaft seal.
The electronics for the KBPC is state-of-the-art and includes short circuit and transient protection
which provides the ultimate in reliability. Electronic overload protection prevents motor burnout
and demagnetization of PM motors. The control can be operated in either the Speed or Torque
mode via jumper selection. The current range, which is also jumper selectable, eliminates the
necessity for calibration of IR Compensation and Current Limit for most applications. The KBPC
also contains jumper selections for AC line voltage (230/115), DC armature voltage (180/90) and
feedback type (armature/Tach-generator).
Standard features include armature fusing*, electronic start/stop and an LED indicator array for
Power On, Stop and Overload (*fuse supplied separately).
Although the KBPC is factory set for most applications, a variety of trimpots allow adjustment of
the following parameters: Minimum and Maximum Speed, Acceleration, Deceleration, Current
Limit, IR Comp, and Timed Current Limit. Optional features offered are: On/Off AC Line Switch,
Forward-Brake-Reverse, Run-Stop-Jog, Input Signal Isolation, RFI Filtering, and Electronic Run-
Brake Module.
WARNING! Be sure to follow all instructions carefully. Fire or electrocution
can result due to improper use of this product. Read Safety Warning.

3
FIG. 1 – CONTROL LAYOUT
(Illustrates Factory Setting of Jumpers and Approximate Trimpot Settings)

4
INCHES
[mm]
FIG. 2 – MECHANICAL SPECIFICATIONS
TM
TM

5
TABLE 1 – ELECTRICAL RATINGS
Model
Input
Voltage
(VAC)
Max. AC
Current
(ARMS)
Output Voltage
(VDC)
Max. DC Output
Current (ADC)
Max.
HP, (KW)
KBPC-240D
115 15.0 0 – 90 10.2 1, (.75)
230 15.0 0 – 180 10.2 2, (1.5)
230 15.0 0 – 90 10.2 1, (.75)
TABLE 2 – GENERAL PERFORMANCE SPECIFICATIONS
Parameter Specification Factory
Setting
AC Line Input Voltage (VAC ±10%,50/60 Hz)
AC Line Frequency (Hz), # of Phases
Arm Voltage Range at 115VAC Line (VDC)
Arm Voltage Range at 230VAC Line (VDC)
Field Voltage at 115VAC Line (VDC)
Field Voltage at 230VAC Line (VDC)
Horsepower Range at 115 VAC HP, (KW)
Horsepower Range at 230 VAC HP, (KW)
Ambient Temperature Range (ºC)
Speed Range (Ratio)
Arm Feedback Load Regulation (% Base Speed)
Tach Feedback Load Regulation (% Set Speed)
Line Regulation (% Base Speed)
Current Ranges (ADC)
ACCEL and DECEL Ranges (Sec.)
MIN Speed Range (% Base Speed)
MAX Speed Range (% Base Speed)
IR Comp Range at 115VAC Line (VDC)
IR Comp Range at 230VAC Line (VDC)
CL Range (% Range Setting)
Timed CL Range (Sec.)
Voltage Following Linearity (% Base Speed)
115 or 230
50/60, 1
0 – 90
0 – 180, 0 – 90
100/50
200/100
1/50 – 1, (.015 – .75)
1/25 – 2, (.03 – 1.5)
0 – 50
50:1
±1
±1
±0.5
2.5, 5.0, 7.5, 10
0.1 – 15
0 – 30
60 – 140
0 – 15
0 – 30
0 – 200
0.5 – 15
±0.5
230
—
—
0 – 180
—
—
—
—
—
—
—
—
—
10
1
0
100
4
8
150
7
—
II. SETTING SELECTABLE JUMPERS.
The KBPC-240D has customer selectable jumpers which must be set before the control can
be used. Bold indicates factory setting. See fig. 1, page 3 for location of jumpers.
A. Control Mode – Speed (SPD) or Torque (TRQ). Note: Factory
setting for J1 is Speed mode. When Jumper J1 is placed in the
"SPD" position the drive will control motor speed as a linear
function of the main potentiometer rotation, or analog voltage
input. The range of output speed can be adjusted with the MIN
and MAX trimpots. The motor will maintain the preset speed as long as the maximum
load does not exceed the current limit set point. If the motor load exceeds the current limit
setting, the Overload LED will turn on and the motor will stall.
SPD
TRQ

6
FIG. 3 – MOTOR SPEED vs POTENTIOMETER ROTATION – [SPEED MODE]
FIG. 4 – PRESET MOTOR SPEED vs MOTOR LOAD – [SPEED MODE]
When Jumper J1 is placed in the "TRQ" position, the drive will control motor torque as a
linear function of main potentiometer rotation. If the motor load exceeds the torque
setting, the motor will stall, the Overload LED will light, and the drive will apply a constant
preset torque based on the potentiometer setting. The Overload LED will light when the
load torque approaches the current limit set point. The torque limits are set via jumper
J4 and the CL trimpot. (Note: When operating in the Torque Mode, Jumper J5 must be
in the "NTCL" position or drive will shut down when CL Timer times out.)

7
Control Set for 230 VAC
(Factory Setting) Control Set for 115 VAC
TABLE 3 – SETTING AC LINE VOLTAGE
WITH JUMPER J2A and J2B
FIG. 5 – MOTOR OUTPUT TORQUE vs POTENTIOMETER ROTATION – [TORQUE MODE]
FIG. 6 – MOTOR SPEED vs APPLIED MOTOR LOAD – [TORQUE MODE]
B. J2A, J2B – Input AC Line Voltage –
Select proper input line voltage
115VAC or 230VAC by placing both
J2A and J2B in the correct
corresponding positions, "115V" or
“230V.”
C. J3 – Armature Voltage Output and
Tach-generator Feedback –Select
the desired armature voltage by
placing J3 in the proper position “90V”
for 90 – 130VDC motors and “180V"
for 180 – 220 VDC motors. For
115VAC line input the armature voltage must be set to “90V.”

8
Control Set for 180 VDC
(Factory Setting) Control Set for 90 VDC
TABLE 4 – SETTING ARMATURE
VOLTAGE WITH JUMPER J3
For 230VAC line input, the
armature voltage is normally set
to"180V". However, it is also
possible to operate in a Step-
Down Mode (90 – 130VDC motor
with a 230VAC line) by setting J3
to "90". However, reduced
performance may result.
If tach-generator feedback is to be
used, J3 must be placed in the "T"
position and an external DC tach-
generator must be connected. See section II, F, p. 9, and section IV, E on page 11 for
additional information.
D. J4 – Armature Current – Select the J4 position (2.5A, 5A, 7.5A, 10A)closest to the rated
motor current. Note that the output is factory set to 150% of the J4 position (e.g. 15 amps
in the 10A position and 11 amps in the 7.5 position, etc.). This setting can be readjusted
using the CL trimpot (see section VII, E on page 14).
TABLE 5 – JUMPER J4 SETTING vs MOTOR HORSEPOWER
JUMPER J4* Motor Horsepower Range
90 VDC 180 VDC
10.0 Amps 1 2
7.5 Amps 3/4 1
5.0 Amps 1/3 – 1/2 3/4 – 1
2.5 Amps 1/6 – 1/4 1/3 – 1/2
Note: Jumper J4 is shown in the factory setting.
Application Note – Subfractional Horsepower Motors. For subfractional motors with
current ratings below 2.5 amps, the KBPC can be modified as follows. Note: Before
making this modification you must have a .05 ohm Plug-in Horsepower Resistor®(KB P/N
9839). Carefully clip out the large power resistor R69 on the printed circuit board. The
resistor location is indicated in fig. 1, p. 3.) Insert the .05 ohm Plug-in Horsepower
Resistor®into the two (2) pins located under the resistor R69. Each of the current
selection values are now divided by 10. See table 6 below.
TABLE 6 – CURRENT LIMIT SETTINGS with .05 OHM
PLUG-IN HORSEPOWER RESISTOR INSTALLED
Original J4 Current
Jumper Selection
New J4 Current
Jumper Selection
New Current Limit
Trimpot Range
New Current Limit Trimpot
Factory Setting
10.0 Amps 1.0 Amps 0 – 2.0 Amps 1.50 Amps
7.5 Amps 0.75 Amps 0 – 1.5 Amps 1.13 Amps
5.0 Amps 0.5 Amps 0 – 1.0 Amps 0.75 Amps
2.5 Amps 0.25 Amps 0 – 0.5 Amps 0.38 Amps
E. J5 – Current Limit Mode –(Factory set for "TCL")This control contains electronic
current limiting which limits the maximum DC current to the motor
(the current limit set point is established with the selection of the
J4 position and the setting of the CL trimpot). Two modes of
current limit operation are provided:
180V
90V 180V 90V

9
1. Timed current limit "TCL": In this mode the drive will turn off after being in current limit
for a preset time. The time period is adjustable with the TCL trimpot from 0.5-15
seconds and is factory set for approximately seven (7) seconds. TCL provides
electronic motor overload protection.
Application Note: After the control times out in TCL, it can be reset using the Start
Switch by setting the switch to the "STOP" position and then to "START," or by
disconnecting and reconnecting the AC line. If the Start Switch is jumpered out, the
control can be restarted after timing out in TCL, by disconnecting and reconnecting the
AC line. Note, the Overload lamp will remain lighted until the control is reset.
2. Non-Timed Current Limit "NTCL": In this mode the drive will reach the preset current
limit during overload and stay at that level until a fuse blows or the drive is manually
turned off. If non-timed CL operation is desired, move jumper J5 from the factory set
"TCL" position to the "NTCL" position. The NTCL position must be used when
operating in the Torque Mode. See section II, A on page 5.
F. J6 – Tach-generator voltage –(Note: Selection of this jumper
position is not required if tach-generator feedback is not used.) If
tach-generator feedback is used, select the J6 position (7V,20/30V,
50V) which corresponds to the tach-generator voltage in Volts/1000
RPM.The selection of J6 position is based on a maximum motor
speed of 1800 RPM. If other than standard tach-generator voltages
and motor speeds are used, an external resistor (RT) may be used
(1/2 watt rating).
1. Install resistor (RT) in series with either tach-generator lead.
2. Place J6 in "7V" position.
3. Calculate the value of (RT) as follows:
RT = [(1.64 x VT x S) - 20,000] ohms VT = Tach Voltage in Volts/1000 RPM
{S = Base speed of motor in RPM
Note: For tach-generator feedback, Jumper J3 must be in the "T" position.
G. J7 – Signal Input Voltage – The output of this control is normally controlled with the main
potentiometer. However, an Isolated analog voltage may also be used in place of a
potentiometer. The control can be scaled for either a 0-5VDC or 0-
10VDC by placing J7 in the appropriate position "5V" or "10V".The
scaling can be further adjusted with the "Max" trimpot. See section IV,
F 2, on page 12 for wiring information.
Note: If an Isolated input signal is not available an accessory Signal Isolator Model KBSI-
240D (KB P/N-9431) can be installed. The KBSI-240D accepts a wide range of signal voltage
and current. An Installation Kit containing Auto/Man Switch and required wiring is also
available (P/N 9377).
III. MOUNTING
Mount the control in a vertical position on a flat surface. Be sure to leave enough room below
the bottom of the control to allow for the AC line and motor connections. Although the control
is designed for outdoor and washdown use, care should be taken to avoid extremely
hazardous locations where physical damage can occur. Note: Do not use this control in
an explosion proof application. If the control is mounted in a closed, unventilated cabinet,
remember to allow for proper heat dissipation. If full rating is required, a minimum enclosure
size of 12" W x 24" H x 12" D should be used.
Front Cover - The KBPC case is designed with a hinge so that when the front cover is open,
all wiring stays intact. To open the cover, the four cover screws must be loosened, so they
no longer are engaged in the case bottom. Note that these screws are captive and the front
cover holes are threaded. After mounting and wiring, close the front cover, making sure all
wires are contained within the enclosure and the gasket is in place around the cover lip.
Tighten all four cover screws so that the gasket is slightly compressed. Do not overtighten.
50V
20/30V
7V
J6
10V

10
FIG. 8 – CONNECTION DIAGRAM
FIG. 7A – CAPTIVE SCREW
TIGHTENED IN CASE
FIG. 7B – CAPTIVE SCREW
ENGAGED IN FRONT COVER
IV. WIRING. Warning! Read Safety Warning before attempting to use this control.
Warning! To avoid erratic operation do not bundle AC Line and motor wires with
potentiometer, voltage following, enable, inhibit or other signal wiring. Use shielded
cables on all signal wiring over 12" (30 cm) – Do not ground shield.
Wire control in accordance with the National Electric Code requirements, and other codes that
apply. Be sure to fuse each conductor which is not at ground potential. Do not fuse neutral
or grounded conductors.Note: See section V, Fusing, on page 13. A separate AC line
switch, or contactor, must be wired as a disconnect switch, so that the contacts open each
ungrounded conductor. An accessory ON/OFF AC Line Switch (KB P/N 9341) may be
installed in this control in lieu of, or in addition to, the Start/Stop Switch normally provided.
The switch can be wired for double pole or single pole operation. (See fig. 8, for AC Line and
Armature connection.)
To maintain the watertight integrity of the control, be sure to use suitable watertight connectors
and wiring, which are appropriate for the application. Two .875" (22.2 mm) knockout holes are
provided for a standard 1/2" knockout connector (not supplied) for wiring. A watertight plug
is provided if only one knockout is required.
A. AC Line – Connect AC Line to terminals L1 and L2. (Be sure jumpers J2A and J2B are
set to the correct position to match the AC line input voltage. See table 8 on page 11.
TABLE 7 – TERMINAL BLOCK WIRING INFORMATION
Terminal Block
Designation
Connection
Designation
Supply Wire Gauge* Maximum Tightening
Torque (lbs inch)
Minimum Maximum
TB1 A1, A2, L1, L2 22 12 12
TB2 F1, F2 22 14 3.5
TB3 T+, T– 22 14 3.5
*Use Cu wire only (AWG)
B. Motor Armature – Connect motor armature
to terminals A1 (+) and A2 (–). (Be sure
jumper J3 is set to closely match motor
voltage. See table 8, p. 11.) WARNING! Do
not wire switches or relays in series with the
armature. Armature switching can cause
catastrophic failure of motor and/or
control. Do not bundle AC and motor
wires with other wires (e.g.,
potentiometer, analog input, Forward-
Brake-Reverse, etc.).
CAPTVE SCREW
COVER
GASKET
CASE
CAPTVE SCREW
COVER
GASKET
CASE

11
FIG. 10 – TACH-GENERATOR
CONNECTION DIAGRAM
TABLE 8 – RELATIONSHIP of AC LINE INPUT AND MOTOR
VOLTAGE with J2 and J3 JUMPER POSITION
AC INPUT VOLTAGE J2A, J2B POSITION J4 POSITION MOTOR VOLTAGE
115 115 90 90
230 230 180 180
230 230 90* 90*
*A 90VDC motor can be used with a 230VAC line. However, speed range may be reduced and
motor derating may be required.
C. Field – For Shunt Wound Motors Only. Do not use terminals F1 and F2 for any other
purpose than to power the field on a shunt wound motor. Connect motor shunt field to
terminals F1 and F2 for 90VDC motors with 100VDC fields and 180VDC motors with
200VDC fields. For motors with half voltage fields, 90VDC motors with 50VDC fields and
180VDC motors with 100VDC fields, connect field to terminals F1 and L1. See table 9 for
summary of Field Connections. See figures 9A and 9B for field wiring diagrams.
CAUTION – Shunt-Wound motors may be damaged if field remains powered without
motor rotating for an extended period of time.
TABLE 9 – FIELD CONNECTIONS (Shunt Wound Motors Only)
AC Line Voltage (VAC) Motor Voltage Field Voltage (VDC) Field Connection
115 90 100 F+, F–
115 90 50 F+, L1
230 180 200 F+, F–
230 180 100 F+, L1
230 90* 100 F+, L1
*Step Down operation (see section II C, p. 7).
FIG. 9A – FULL VOLTAGE FIELD FIG. 9B – HALF VOLTAGE FIELD
D. Ground – Be sure to ground (earth) the
control by connecting a ground wire to the
Green Ground Screw located to the right of
the terminal block. (See fig. 1, p. 3)
E. DC Tach-generator Input –If tach-
generator feedback is required, an analog
tach signal must be connected to the
terminal block TB3. (Note: For tach-
generator feedback Jumper J3 must be set
to the "T" position, jumper J6 must be set for the proper tach voltage, and the IR COMP
must be set to minimum (ccw) position.)(See section II F, p. 9.) Connect the tach-
generator so that when the motor rotates the positive tach voltage lead is connected to
T+ and the negative tach lead is connected to T– (See figure 10).
TACHOMETER WIRES MUST BE CONNECTED SO THAT
CORRECT POLARITY IS ACHIEVED WHEN TACH ROTATES

12
FIG. 11 – REMOTE
POTENTIOMETER
FIG. 12 – ANALOG VOLTAGE
FIG. 13 – REMOTE START/STOP SWITCH
FIG. 14 – INHIBIT CIRCUIT
Note: If the tach voltage is connected backwards, the control will drive the motor
at full speed only. Note: If the Forward-Brake-Reverse switch is used, provision
must be made to reverse the polarity of the tach-generator leads when the control
is switched to "Reverse."
Warning! To avoid erratic operation do not bundle AC Line and motor wires with
potentiometer, voltage following, enable, inhibit or other signal wiring. Use
shielded cables on all signal wiring over 12" (30 cm) – Do not ground shield.
F. Main Potentiometer – The control is supplied with
the main potentiometer prewired. However, the
control can also be operated from a remote
potentiometer, or from an Isolated analog voltage
for voltage following. To operate from an external
source remove white, orange and violet
potentiometer leads from terminals P1, P2 and P3.
The leads may be taped and left in the control. The
potentiometer itself may be removed, if a watertight seal is used to cover the hole in the
front cover.
1. Remote Potentiometer – Connect remote potentiometer wires to terminals P1, P2 and
P3, so that the "high" side of the potentiometer connects to P3, the "wiper" to P2 and
the "low" side to P1. (See figure 11.)
2. Analog Input – An isolated 0-5 or 0-10VDC
analog voltage can also be used to drive the
control. Note: If an isolated signal voltage is
not available, an optional signal isolator can
be installed (Model KBSI-240D, P/N 9431,
see figure 17, p. 20 for signal isolator wiring
diagrams). Connect the isolated input voltage
to terminal P2 (+) and P1 (–). (See fig. 12)
Note: Be sure jumper J7 corresponds to proper range of input voltage 0-10 or 0-
5VDC. When the potentiometer is disconnected from P1, P2 and P3 to connect an
analog input signal, the MIN trimpot will have to be adjusted clockwise to achieve a
0+output voltage.
G. Remote Start/Stop Switch – A remote
Start/Stop Switch can be installed by
removing the wires from the "Start,"
"Com" and "Stop" terminals, and
reconnecting them to a remote switch.
(See fig. 13.) Note: To eliminate
Start/Stop function, join the "Start" &
"Com" Quick Connect terminals with a jumper.
H. Inhibit –The control can be
electronically stopped and started with
the Inhibit circuit. To "Stop" the
control, Terminals I1 & I2 must be
joined via a contact. The control can
be restarted by opening the contact.
Note: The Inhibit should not be used as a safety disconnect. Use only the AC Line
for that purpose. (See fig. 14.) Note: The Inhibit Circuit is not isolated. Do not common
or ground inhibit leads.
I. Enable – The control can also be started and stopped with an Enable circuit (the Enable
circuit functions opposite to that of the inhibit circuit; INHIBIT: open to start-close to stop,
ENABLE: open to stop-close to start). The Enable function is established by wiring a
contact in series with the violet potentiometer lead connected to terminal P3. (See fig. 15
on page 13.) The Enable circuit is not isolated. Do not common or ground wiring. Note:
The MIN speed trimpot must not be set higher then 70% CW rotation (approx. 2:00 o'clock
position) or Enable will not function.

13
FIG. 15 – ENABLE CIRCUIT
V. FUSING.
A. AC Line Fusing – Most electrical codes require that each ungrounded conductor contain
fusing. Separate branch circuit fusing, or circuit breaker may be required. Check all
electrical codes that may apply to the installation. This control does not contain AC line
fuses. A 20 amp rated fuse or circuit breaker can be used.
B. Armature Fusing – The correct size armature fuse must be installed,depending on the
rating of the motor. Control will not operate if fuse is not installed. Fuse type should
be Littelfuse 326 ceramic, Buss ABC, or equivalent. A fuse chart is presented below
which suggests appropriate armature fuse ratings. However, the specific application may
require larger fuse ratings based on ambient temperature, CL set point and duty cycle of
operation. (See table 10 below.) (Fuse rating is based upon 1.7 times the motor current
rating.)
TABLE 10 – ARMATURE FUSE CHART
Motor Horsepower Approx. DC Motor
Current Amps
Fuse Rating
(AC Amps)
90VDC 180VDC
1/8 1/4 1.3 2
1/6 1/3 1.7 2
1/4 1/2 2.5 4
1/3 3/4 3.3 5
1/2 15.0 8
3/4 17.5 12
1 2 10.0 20
Note: Armature fuse is not supplied and must be installed for control to operate.
VI. OPERATION
WARNING! Read Safety Warning on page 2 before attempting to operate the
control or severe injury or death can result. Failure to follow the Safety
Warning Instructions may result in electric shock, fire or explosion.
After the control has been set up properly (the jumpers set to the desired positions, and the
wiring completed), the start-up procedure can begin. If AC power has been properly brought
to the control, the "ON" LED and the "STOP" LED indicators will be lighted. Before initially
starting, be sure the main potentiometer is in the minimum position. To start the control move
the Start/Stop toggle to the "Start" position and release. The "Stop" LED should extinguish
and the motor should rotate as the potentiometer knob is rotated clockwise. Note: If the
motor rotates in the incorrect direction, it will be necessary to disconnect the main AC power
and reverse the armature wires. To stop the motor, move the Start/Stop toggle to the Stop
position. If power is lost, the control will not restart, unless the Start/Stop toggle is moved to
the Start position.
SWITCH, RELAY OR FET
OPEN TO "STOP"
CLOSE TO "START
MAIN
POTENTIOMETER MAIN POTENTIOMETER
A SOLID STATE RELAY CAN ALSO
BE USED WITH OPEN COLLECTOR
P3 P3

14
VII. TRIMPOT ADJUSTMENTS.
The control contains trimpots, which have been factory adjusted for most applications. Figure
1page 3 illustrates the location of the trimpots and their approximate adjustment positions.
Some applications may require readjustment of the trimpots in order to tailor the control to
exact requirements. (See table 2, p. 5 for range and factory setting of all trimpots.) Readjust
trimpots as follows: WARNING.Do not adjust trimpots with main power on if possible. If
adjustments are made with power on, insulated adjustment tools must be used and
safety glasses must be worn. High voltage exists in this control. Electrocution and/or
fire can result if caution is not exercised. Safety warning must be read and understood
before proceeding.
A. Minimum Speed (MIN) –The MIN trimpot is used to set the minimum voltage of the drive.
This sets the minimum speed of the motor. Adjust the MIN trimpot as follows:
1. Rotate Main Potentiometer to minimum speed position (full counterclockwise).
2. Increase setting of MIN trimpot so that motor runs at desired minimum speed.
B. Maximum Speed (MAX) – The MAX trimpot is used to set the maximum voltage of the
drive. Adjust the MAX trimpot as follows:
1. Rotate Main Potentiometer to maximum speed position (full clockwise).
2. Adjust MAX trimpot setting to desired setting of motor speed.
C. Acceleration (ACCEL) – The ACCEL trimpot sets the amount of time it takes the control
to reach full output. The trimpot is factory set to one (1) second. If more rapid
acceleration is desired, rotate the trimpot counterclockwise. Note: Rapid ACCEL setting
may cause the current limit circuit to activate which will extend the acceleration time. For
alonger acceleration time, rotate ACCEL trimpot clockwise. 50% rotation represents
approximately seven (7) seconds and full rotation is approximately fifteen (15) seconds.
D. Deceleration (DECEL) – The DECEL trimpot sets the amount of time it takes the control
to go from full speed to minimum speed when rotating the main potentiometer CCW. The
trimpot is factory set to one (1) second, and can be readjusted to full counterclockwise
position for more rapid DECEL. Note: On high inertial loads, a rapid DECEL setting may
cause the motor to coast to a stop slower than the DECEL setting. To increase
deceleration time, rotate DECEL trimpot clockwise. 50% rotation represents
approximately seven (7) seconds and full rotation is approximately fifteen (15) seconds.
Note: The Decel circuit works when rotating the main speed pot in the CCW direction or
when opening the P3 lead of the main pot or when placing the Start/Stop Switch Toggle
to the Stop position. It does not operate when power is removed.
E. Current Limit (CL) – This trimpot is used to set the maximum amount of DC current that
the motor can draw. The amount of DC current determines the amount of maximum
motor torque in both the Speed Control Mode and Torque Mode. The CL trimpot is factory
set at 150% of the current established by the jumper J4 selection. Also see section VIII
C, on page 15). Readjust the CL trimpot as follows:
1. Turn CL trimpot to minimum (CCW) position. Be sure jumper J4 is in proper position
approximately equal to the motor DC ampere rating.
2. When jumper J1 is set to the Speed Control Mode the main potentiometer should be
set at 50% rotation. When jumper J1 is set to the Torque Mode the main
potentiometer should be set at 100% of full rotation.
3. Wire in a DC ammeter in series with armature lead. Lock shaft of motor.
4. Apply power. Rotate CL trimpot CW until desired CL setting is reached (factory
setting is 1.5 times rated motor current).
CAUTION:
1. Adjusting the CL above 150% of motor rating can cause overheating and
demagnetization of some PM motors. Consult motor manufacturer.

15
2. Do not leave the motor in a locked condition for more than a few seconds since
armature damage may occur.
F. IR Compensation (IR) – The IR comp circuit is used to stabilize motor speed under
varying loads. (Note: If control is in Tach Feedback mode, the IR trimpot should be
set to minimum - ccw.) Readjust the IR trimpot as follows:
1. Run the motor at approximately 30-50% of rated speed under no load and measure
actual speed;
2. Load the motor to rated current. Rotate IR trimpot so that the loaded speed is the
same as the unloaded speed measured in 1.
Control is now compensated so that minimal speed change will occur over a wide range
of motor load. (Note: Too much IR Comp will cause unstable [oscillatory] operation.)
G. Timed Current Limit (TCL) – Jumper J5 must be in the "TCL" position, in order for Timed
Current Limit to be operational. This trimpot determines the approximate amount of time
the drive will stay in Current Limit before trip out. The trimpot has an adjustment range
of .5-15 seconds and is factory set for seven (7) seconds. The trimpot can be reset
according to the desired trip time. Rotating the trimpot clockwise increases the trip time.
This function provides motor overload protection. (See page 9, section II, E 1,
"Application Note," for TCL operation.)
H. Jog Speed (JOG) – This trimpot is operational only when the optional RUN-STOP-JOG
Switch is installed (KB P/N 9340). In the JOG position the JOG trimpot can be used to
set the JOG speed.
VIII. FUNCTION INDICATOR LAMPS.
The control contains three function LED Indicator Lamps that reflect its operational status.
A. Power On Indicator (ON) – This lamp will glow GREEN when the AC line is connected
to the control.
B. Stop Indicator (STOP) – This lamp will glow YELLOW when the control is placed in the
STOP mode with the Start/Stop Switch.
C. Overload Indicator (CL) –When the motor is loaded to the current limit setpoint (CL
setpoint is established by the setting of jumper J4 and the CL trimpot), this lamp will glow
RED. If the control is allowed to stay in CL and then trips out in Timed Current Limit, the
OL LED will remain lighted, until the control is restarted with the Start/Stop Switch. If the
OL LED remains lighted during control operation, a fault condition may exist. Possible
causes for this condition are as follows:
1. Motor is overloaded – Check motor amps with DC ammeter in series with armature.
(If motor is shunt type, field may be open or not receiving proper voltage.)
2. Motor may be defective – Check motor for shorts or grounds.
3. The CL may be set too low – Check position of jumper J4 and CL trimpot.
NOTE: In some applications, especially those requiring the motor to cycle on and
off or from one speed to another, the OL indicator may blink indicating a transient
overload. This may be a normal condition for the application.
IX. OPTIONAL ACCESSORIES.
A. RUN-STOP-JOG Switch (P/N 9340) – This switch provides a momentary jog speed that
can be used to "inch" a machine into position. It assembles easily to the control via quick
connect terminals. A rubber switch seal is included in order to maintain watertight
integrity.
B. Forward-Brake-Reverse Switch (P/N 9339) –This module provides a reversing function
along with dynamic braking. A special hesitation switch is used along with an Inhibit
function which minimizes arcing and plug-reversing. The installation is made simple with
the use of quick-connect terminals. Note: Signal Isolator (P/N 9431) cannot be
installed with Foward-Brake-Reverse Switch.

16
C. Signal Isolator (Model KBSI-240D, P/N 9431) –Signal isolation is required when a
remote nonisolated analog signal is to be used. Provision is made to install Model KBSI-
240D on 4 bosses inside the front cover. The unit accepts a variety of voltage and current
signals.
Note: Foward-Brake-Reverse Switch (P/N 9339) cannot be installed with Signal
Isolator.
D. Auto/Manual Installation Kit (P/N 9377) –This kit facilitates mounting of KBSI-240D
Signal Isolator into KBPC-240D. Contains Auto/Man Switch and necessary wiring and
hardware. (KBSI-240D, P/N 9431 purchased seperately).
E. ON/OFF AC Line Switch (P/N 9341) –This option is desirable if a positive AC Line
disconnect is required. The switch can be installed in lieu of the Start/Stop Switch (which
can be easily removed) or in place of the Run-Stop-Jog or the Forward-Brake Reverse
Switch. Installation is made via quick-connect terminals.
F. RFI Filter (Model KBRF-200A, P/N 9945A) – The KBRF-200A meets the requirements
of CE directives pertaining to RFI filtering.
G. Electronic Forward-Brake-Reverse (APRM-PC P/N 9378) – The APRM-PC provides
electronic reversing with solid state dynamic braking. Plug reversing is eliminated with
KB’s patented APRM®.The Unit is supplied with a FWD-BRK-REV toggle switch;
however, it can also be switched with an external switch or relay.

20
FIG. 17 – CONNECTION DIAGRAMS FOR KBPC-240D WITH KBSI-240D SIGNAL ISOLATOR