Spectech VARI-DRIVE KBWM-120 User manual
INSTALLATION AND OPERATING INSTRUCTIONS
VARI-DRIVE
NEMA1/IP20 SCR Variable Speed DC Motor Controls
Model KBWM-120 rated 1/100 - 1/3 HP (90 Volts DC) @ 115 Volts AC, 50/60 Hz
Model KBWM-240 rated 1/50 - 3/4 HP (180 Volts DC) @ 208/230 Volts AC, 50/60 Hz
ON
OFF
60
50
40
30
20
10
0
(%) SPEED
100
90
80
70
ARI- RIVE
DC MOTOR
SPEED CONTROL
V D TM
!
TM
A COMPLETE LINE OF MOTOR DRIVES
© 2001 KB Electronics, Inc.
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.
See Safety Warning on Page 1
See Page 2
TM
Spec Tech Industrial 203 Vest Ave. Valley Park, MO 63088 Phone: 888 SPECTECH
TABLE OF CONTENTS
Sec ion Page
i. Simplified perating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
ii. Safety Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
I. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
II. Control Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
III. Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IV. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
V. peration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VI. Trimpot Adjustments and Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VII. Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Tables
1. General Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Electrical Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3. Plug-in Horsepower Resistor® Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Armature Fuse Selection Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Terminal Block Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Field Connection (Shunt Wound Motors nly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figures
1. Control Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2. Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Motor Voltage Selection (J2) (Model KBWM-240 nly) . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. AC Line and Armature Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5A. Full Voltage Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5B. Half Voltage Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6A. Accel Trimpot Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6B. Decel Trimpot Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Internal Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ii
i. KBWM-120, 240 SIMPLIFIED OPERATING INSTRUCTIONS
A. Power Connec ion – Wire AC line to ter-
minals L1 and L2. Be sure the model num-
ber corresponds to the correct input voltage.
B. Permanen Magne (PM) Mo or
Connec ion (Two-Wire Type) – Wire
the motor armature leads to terminals
A(+) and A(-). Be sure the motor volt-
age corresponds to the control voltage rating and model number.
Note: Although control is specifically designed for PM motors it can also be used for
shunt wound motors. (See Section IV D, page. .)
C. Ground – Be sure to earth ground the control by attaching a ground wire to the green stud
located between the Bx knockouts.
D. Plug-in Horsepower Resis or®** – The correct Plug-in Horsepower Resistor® must be
installed for optimum performance. (See Section II A, p. 5.)
E. Arma ure Fuse** – The correct value armature fuse must be installed for maximum pro-
tection. (See Section II C, p. 5.)
F. Trimpo Se ings – All trimpots have been set according to Figure 1, page 3 and Section VI, page 8.
G. Jumper J2 is provided on Model KBWM-240 only and is factory set to “180V” position.
For step-down operation (208/230 Volts AC line input and 0-90 Volts DC output), set J2 to
the “90V” position. See Figure 3, on page 6.
**This control will not operate without installing the proper size Plug-in Horsepower Resistor® and armature fuse
– supplied separately.
Model Number AC Line Vol age
VAC 50/60 Hz
Arma ure
Vol age (VDC)
KBWM-120
KBWM-240
115
208/230
0 – 90
0 – 90*, 180
1
IMPORTANT – You must read these simplified operating instructions before proceeding. 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 before proceeding.
MODEL NO. & VOLTAGE RATING
ii. SAFETY WARNING! Please read carefully
This product should be installed and serviced by a qualified technician, electrician, or electrical mainte-
nance person familiar with its operation and the hazards involved. Proper installation, which includes wiring,
mounting in proper enclosure, fusing or other over 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 control under power. This product is constructed of materials (plas-
tics, 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 further information is required on this product, contact the Sales
Department. 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 effective 9/2000).
This control contains electronic Start/Stop 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.
Be sure to follow all instructions carefully. Fire and/or electrocution can result due to improper use of
this product.
!
*See “G” below.
I. INTRODUCTION
The KBWM™ Vari-Drive™ adjustable speed SCR control for DC motors offers proven relia-
bility in a rugged all-metal NEMA-1/ IP20 enclosure. The Vari-Drives™ are equipped with the
ultimate KBMM™ speed control module. They are specifically designed for fractional horse-
power permanent magnet (PM) DC motors. Two models are offered. The KBWM-120 is
designed for 115 VAC input and is rated 1/100-1/3 HP at 90 VDC. The KBWM-240 is
designed for 208/230 VAC input and is rated 1/50 – 3/4 HP @ 180 VDC. No e: Model
KBWM-240 can also be used on 90 Volt DC motors. See Section IID, on page 6.
KB’s exclusive Plug-in Horsepower Resistor®* automatically presets the drive’s IR Comp. for
maximum performance and CL circuits for safe operation on various motors. Although fac-
tory calibrated, internal trimpots for MIN, MAX, IR, CL, ACCEL and DECEL can be used to
fine-tune the KBWM™ for specific applications. Connections to the control are via a barrier
terminal block. By changing the orientation of the front cover, the wiring can be brought in
either from the bottom or the top of the control.
Motor failure due to demagnetization is eliminated by the patented ultra-fast Direct-Fed™
current limit circuit. The controls contain AC line and armature* fusing, which provide pro-
tection against catastrophic failure. Auto-Inhibit®, a KB exclusive, allows the drive to be
turned on and off rapidly using the AC line without damage to the control and/or motor. The
internal CL LED is a diagnostic indicator that lights when the motor is overloaded.
A conveniently located front panel lighted rocker switch controls AC line input power to the drive.
*Plug-in Horsepower Resistor® and armature fuse supplied separately.
2
This product complies with all CE directives pertinent at the time of manufacture. Contact
factory for detailed installation and Declaration of Conformity. Installation of a CE approved
RFI filter (KBRF-200A [P/N 9945C] or equivalent) is required. Additional shielded motor cable and/or
AC line cables may be required along with a signal isolator (KBSI-240D [P/N 9431] or equivalent).
Parame er Specifica ion
Speed Range Ratio 50:1
Armature Feedback Load Regulation (0 - Full Load, 50:1 Speed Range) (% Base Speed) 1**
Control Linearity (% Speed vs. Dial Rotation) 2
Line Voltage Regulation at Full Load, ± 10% Line Variation (% Base Speed) 1/2**
CL/Torque Range (% Full Load) 0 – 200
ACCEL Time Range (0 – Full Speed) (Secs.) 0.2 – 10
DECEL Time Range (Full – 0 Speed) (Secs.) 0.2 – 10
MIN Speed Trimpot Range (% Full Speed) 0 – 30**
MAX Speed Trimpot Range (% Full Speed) 50 – 110**
IR Comp. Trimpot Range (at Specified Full Load) (Volts) 0 – 24
Maximum Allowable Ambient Temperature at Full Rating (ºC / ºF) 50/122
TABLE 1 – GENERAL PERFORMANCE SPECIFICATIONS
**Performance is for SCR rated PM motors only. Lower performance can be expected with other motor types. Factory
setting is for 3% load regulation. To obtain superior regulation, see Section VI F on page 10.
3
3/4, (0.50)
Model No. Par No. Inpu Vol age
(VAC - 50/60 Hz)
9380
9381
KBWM-120
KBWM-240
Max. AC
Load Curren
(RMS Amps)
Arma ure
Vol age (VDC)
Max. DC
Load Curren
(DC Amps)
Max. Horsepower
HP, (kW)
1/3, (0.25)
115
208/230
5.0
5.0
5.0
0 – 90
0 – 180
0 – 90*
3.5
3.5
3.5
1/3, (0.25)
TABLE 2 – ELECTRICAL RATINGS
*No e – S ep-down Opera ion: Motor may have reduced brush life. Consult motor manufacturer.
MAX MIN
P2
P3
P1
I1
I2
ACCEL
DECEL
L1
T
L2
B
F+
F1
SW6
BLU
LINEARM
A+
L1 L2 A-
TB1
F2
IRCL
F-
WHT
SW3
180V90V
J2
N KBWM-240 NLY
J2 IS INSTALLED
PLUG-IN
H RSEP WER RESIST R
(CUST MER INSTALLED)
(FACT RY INSTALLED)
LINE FUSE
(CUST MER INSTALLED)
CL LED
SEE TABLE 4, PAGE 5
SEE TABLE 3, PAGE 5
ARMATURE FUSE
FIGURE 1 – CONTROL LAYOUT
(Illustrates Approximate Factory Setting of Trimpots and Jumper)
PLUG-IN HORSEPOWER RESISTOR
A Plug-in Horsepower Resistor® must be installed to match
the drive to the motor horsepower and armature current. See
Table 4, page 5 for the correct value. Plug-in Horsepower
Resistors® are stocked by your distributor.
CAUTION: Be
sure Plug-In
Horsepower
Resis or® is
inser ed com-
ple ely in o
ma ing socke s.
4
FIGURE 2 – MECHANICAL SPECIFICATIONS (Inches / [mm])
[93.60]
3.69
[46.80]
1.84
R [2.30]
0.09
[161.50] [134.00]
5.28
6.36
[58.60]
2.31
3.00
[76.20]
DO NOT REMOVE
THESE (5) SCREWS.
REMOVE SCREWS TO OPEN CASE
[173.00]
6.81
ON
OFF
60
50
40
30
20
10
0
(%) SPEED
100
90
80
70
ARI- RIVE
DC MOTOR
SPEED CONTROL
VD
TM
TM
TOP VIEW BOTTOM VIEW
II. CONTROL SETUP
Remove the four (4) 6x32 screws (two on top and two on the bottom) from the enclosure. Slide
open the control by separating the front and rear covers. See Figure 2, page 4.
A. Plug-in Horsepower Resis or® – (Must be obtained from your distributor as a separate
part.) The Plug-in Horsepower Resistor® is designed to match the control and motor with-
out having to recalibrate the IR Comp. and CL for most applications. (Note: For recali-
bration of IR Comp. and CL see Section VI E, F on pages 9 and 10.) Using the Plug-in
Horsepower Resistor® chart, choose the closest value based on motor horsepower
and/or armature current. (See Table 3.)
B. AC Line Fuse – The KBWM™ contains a 5-
Amp AC line fuse used to protect the control
against catastrophic failure. If fuse blows, the
control may be miswired, the motor is shorted
or grounded, or the speed control module is
defective. Replace with Littelfuse 326, Buss
ABC or equivalent. Note: Bypassing or elimi-
nating the fuse will void warranty.
CAUTION: Most electrical codes require that
each ungrounded conductor contain fusing.
Separate branch fusing or circuit breakers may
be required on 208/230 VAC line.
C. Arma ure Fuse — The KBWM™ has provi-
sion for installing an armature fuse that helps
protect the motor and control from damage
due to overload. Armature fuses are 3 AG type
and are available from your distributor.
Note: An armature fuse must be installed or
control will not operate. Fuse value is calculat-
ed based on 1. times the DC current rating of the motor. See Table 4.
5
5
90 VDC 180 VDC
Mo or Horsepower
Range
Approx.
Mo or
Curren
(DC Amps)
Fuse
Ra ing
(AC Amps)
1/100
1/50
1/30
1/20
1/15
1/10
1/8
1/6
1/4
1/3
1/50
1/25
1/15
1/10
1/8
1/5
1/4
1/3
1/2
3/4
0.1
0.2
0.3
0.5
0.7
1.0
1.3
1.7
2.5
3.3
1/5
3/10
1/2
3/4
1
11⁄2
2
3
4
TABLE 4 – ARMATURE FUSE
SELECTION CHART
9840
90 VDC 180 VDC
Mo or Horsepower Range
Approx.
Mo or Curren
(DC Amps)
Plug-in Horsepower
Resis or® Value
(Ohms)
Individual
Plug-in Horsepower®
Resis or Par No.
1/3
1/100
1/50
1/30, 1/25
1/20
1/15, 1/12
1/10, 1/8, 1/6
1/4
1/50
1/25
1/15
1/10
1/6
1/4
1/2
3/4
0.1
0.2
0.35
0.5
0.8
1.3
2.5
3.3
1.0
0.51
0.35
0.25
0.18
0.1
0.05
0.035
9833
9834
9835
9836
9837
9838
9839
TABLE 3 – PLUG-IN HORSEPOWER RESISTOR® CHART
Note: Specific applications may require a differ-
ent fuse value than indicated. This is based on
several factors such as ambient temperature.
Notes:
1. Motor horsepower and armature current must be specified in order to select correct Plug-in Horsepower Resistor®.
2. For motor horsepower not indicated, use the lower ohm value Plug-in Horsepower Resistor®.
D. Jumper J2 is provided on Model KBWM-240 only
and is factory set to “180V” position. For step-
down operation (208/230 Volts AC line input and 0-
90 Volts DC output), set J2 to the “90V” position.
See Figure 3.
III. MOUNTING
The KBWM™ is mounted via the rear cover
mounting strap. Before attempting to wire the
control, locate the mounting holes using the rear
cover as a template or use the dimensions as shown in the outline drawing. (See Figure 2,
page 4.) Be sure the control is mounted on a flat surface in a location where it will not be
exposed to contaminants such as water, metal chips, solvents or excessive vibration and/or
temperature extremes. Note: Allow adequate clearance around control to permit motor and
AC power cables to enter through the Bx knockouts on bottom of enclosure.
When mounting in an airtight enclosure, the air space should be large enough to provide ade-
quate heat dissipation. It is recommended that an enclosure with minimum dimensions of 12”H
x 12”W x 6”D (300mm x 300mm x 150mm) be used. The maximum allowable ambient temper-
ature at full rating is 50 ºC (122 ºF). Consult the Sales Department if more information is required.
Note: The KBWM™ can be oriented so that the AC power and motor wiring can be brought
in from the top of the control. Mount the rear cover so that the Bx knockouts are located on
the top by rotating the rear cover 180º. The front cover is then installed right side up using
the four (4) 6x32 screws previously removed from the top and bottom of the enclosure.
After wiring the front cover, install the mating rear cover with the four (4) 6x32 screws previ-
ously removed from the top and bottom of enclosures.
IV. WIRING
Be sure the AC power is “off” before wiring control. Read Safety Warning on page 1 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) – The shield should be earth ground-
ed on the control side only. Wire the control in accor-
dance with the National Electrical Code requirements
and other codes that may apply to your area.
A. AC Line – Wire the AC power to terminals L1 and
L2. Be sure that the control model corresponds to
the correct AC line input voltage. Model
KBWM–120 is for 115 VAC 50/60 Hz and model
KBWM–240 is for 208/230 VAC 50/60 Hz. See
Figure 4.
6
!
3.5
Maximum Tigh ening Torque
(in-lbs)
Supply Wire Gauge
Terminal Block
Designa ion
Connec ion
Designa ion
TB1 L1, L2, A+, A- 22 14
Minimum Maximum
TABLE 5 – TERMINAL BLOCK WIRING INFORMATION
SW6 L2
L1
BLU
A+ A-
TB1
M
MOTOR
-
+
AC LINE
FIGURE 4 – AC LINE & ARMATURE
CONNECTION
180V90V
180V90V
J2 Se for
180 Vol DC Mo ors
(Fac ory Se ing)
J2 Se for
90 Vol DC Mo ors
(S ep-Down)
FIGURE 3 – MOTOR VOLTAGE SELECTION
(MODEL KBWM-240 ONLY)
Cau ion: If control is wired to a transformer, it is advisable to switch the secondary to dis-
connect power. If the primary is switched, additional snubber capacitors may have to be
added across terminals L1 and L2 to prevent power bridge damage.
Separate branch fusing or circuit breaker may be required on 208/230 VAC applications. (See
Section IV E, on page 8.)
B. Mo or Arma ure – Wire the motor armature wires to terminals A+ and A-. Be sure the motor
voltage corresponds to the control voltage rating. See Figure 4, on page 6. Note: If motor
runs in opposite direction to what is required, turn power off and reverse armature leads.
WARNING! Do not wire a switch or relay in series with the armature leads.
Armature switching can cause catastrophic failure of motor and/or control. If
reversing or dynamic braking is required, consult the Sales Department.
C. Ground (ear h) – Be sure to ground motor and control to green ground stud located between
the Bx knockouts. See Figure 7, on page 11.
D. Field (Shun mo ors only) – Do not use F+ and F- terminals for any other motor type. The
KBWM™ control is primarily designed for permanent magnet (PM) motors. However, a shunt
motor can also be controlled by wiring the shunt field directly to the 1/4” quick-disconnect ter-
minals located on the main speed control module. See Figures 5A and 5B for the F+ and F-
terminal locations. Attach motor field using insulated 1/4” Q-D female terminals. For
Standard PM (2-wire) motors, the Field is not used.
CAUTION: Shunt-wound motors may be damaged if field remains connected without motor
rotating for an extended period of time.
7
!
MIN
I1
I2
T
L2
B
F+
F1
SW6
BLU
LINEARM
A+
L1 L2 A-
TB1
F2
F-
WHT
SW3
AC LINE M T R
M
FIELD*
-
+
-
+
180V90V
J2
F+, L1
AC Line Vol age VAC Mo or Vol age Field Vol age (Vol s DC) Field Connec ion
115
115
208/230
208/230
208/230
0 – 90
0 – 90
0 – 180
0 – 180
0 – 90
100
50
200
100
100
F+, F-
F+, L1
F+, F-
F+, L1
TABLE 6 – FIELD CONNECTION (Shun Wound Mo ors Only)
FIGURE 5A – FULL VOLTAGE FIELD
MIN
I1
I2
T
L2
B
F+
F1
SW6
BLU
LINEARM
A+
L1 L2 A-
TB1
F2
F-
WHT
SW3
AC LINE MOTOR
M
FIELD*
+
-
-
+
180V90V
J2
FIGURE 5B – HALF VOLTAGE FIELD
*Shunt motors only
E. Fusing – As indicated in Section IIB, the KBWM™ contains a single AC line fuse on
208/230 VAC applications. In the USA and other countries where the 208/230 volt is
derived from two (2) “hot” leads, both AC lines should be connected to a separate dual cir-
cuit breaker. Do not fuse neutral or grounded connections.
F. AC Line Swi ch – The KBWM™ contains a double pole AC line switch which opens both
legs of the AC line.
V. OPERATION
After wiring is complete, recheck connections to be sure they are correct. Also be sure cor-
rect armature fuse and Plug-in Horsepower Resistor® are installed. Turn main power on.
Internal lamp in power switch should be lighted indicating control is receiving AC line voltage.
Gradually increase main speed dial setting. Motor should rotate in proportion to dial setting.
Note: if motor runs in opposite direction to what is required, turn power off and reverse arma-
ture leads.
WARNING! If control is operated with cover off, be sure to wear safety glasses
and use insulated tools if any adjustments are to be made.
CL LED – A red light-emitting diode (LED) can be found on the speed control PC board. It
lights when the current limit circuit activates, indicating an overload condition. This is normal
when the motor accelerates to full speed or when a transient peak load condition exists.
However, if the LED lights continuously, a severe overload condition may exist. A DC amme-
ter should be installed in series with either armature lead to observe motor current during
actual operation. (See Safety Warning on page 1.) If the actual DC current exceeds the
motor rating, a higher horsepower motor should be used. If actual current is equal to or less
than the rated motor current, the CL adjustment may be incorrect, or the Plug-in Horsepower
Resistor® value may be too high. Refer to the CL trimpot adjustment procedure and the
Plug-in Horsepower Resistor® chart on page 5.
VI. TRIMPOT ADJUSTMENTS AND CONTROL FUNCTIONS
WARNING! If adjustments are made under power, insulated adjustment tools must
be used and eye protection must be worn.
The KBWM™ has been factory adjusted to provide 0 - full speed using the speed control
knob. Minimum (MIN) and Maximum (MAX) speed trimpots are provided to change the
speed settings. The acceleration (ACCEL) trimpot is provided to allow for a smooth start over
an adjustable time period each time the AC power is applied or the Main Speed
Potentiometer is rotated. The DECEL trimpot controls the amount of ramp-down time when
the Main Speed Potentiometer is adjusted to a lower speed. The Current Limit (CL, or torque
output) adjustment is factory set to approximately 1.5 times the motor rating. The IR
Compensation (IR) is factory adjusted to provide excellent motor regulation under normal
operation.
Note: For the IR Comp. and CL trimpot settings to be correct, the proper Plug-in Horsepower
Resistor® must be installed. (See Table 3 on page 5.) Do not attempt to change the set-
tings of the trimpots unless absolutely necessary since they are factory adjusted to near opti-
mum settings.
The following procedure, presented in order of adjustment sequence, should be used when
readjusting all trimpot functions:
8
!
!
A. Accelera ion S ar – The ACCEL is
factory set at approximately 2 seconds.
To readjust to different times, set the
knob to the desired position as shown
in Figure 6A.
B. Decelera ion – The DECEL is factory
set to provide a ramp-down time of 2
seconds. To change the ramp-down
time, adjust the DECEL trimpot as indi-
cated in Figure 6B.
C. Minimum Speed Adjus men – If a
higher than zero minimum speed is
needed, readjust the minimum speed
by turning the speed control knob to
zero setting (full CCW position). Then
adjust the MIN speed trimpot to the
desired setting.
Note: The minimum speed adjustment
will affect the maximum speed setting.
Therefore, it is necessary to readjust
the maximum speed after the minimum
speed.
D. Maximum Speed Adjus men – Turn
Speed Control Knob to full speed (full
CW position). Adjust MAX speed trim-
pot to new desired setting.
Note: Do not attempt to adjust the max-
imum speed above the rated motor RPM
since unstable motor operation may
occur. For moderate changes in the
maximum speed, there will only be a
slight effect on the minimum speed setting.
E. Curren Limi (CL/Torque Adjus men ) – CL circuitry is provided to protect the motor
and control against overloads. The CL also limits the inrush current to a safe level during
startup. The CL is factory set to approximately 1.5 times the full load rating of the motor.
(CL trimpot is nominally set to approximately 65% of full CW rotation.) Note: Proper size
Plug-in Horsepower Resistor® must be installed.
To set the CL to factory specifications adjust as follows:
1. Set speed control knob at approximately 30 - 50% CW rotation. Set CL trimpot to full
CCW position.
2. Connect a DC ammeter in series with the armature lead.
3. Lock shaft of motor (be sure CL pot is in full CCW position). Apply power and rotate CL
pot CW until DC ammeter reads 1.5 times motor rating. (Do not exceed 2 times motor
rating.) Do not leave motor in locked rotor position for more than a few seconds or dam-
age may occur. Note: The CL LED will illuminate when the control is in current limit.
9
10 SEC.
SL W
0.2 SEC.
RAPID
FACT RY SETTING 2 SEC.
5 SEC.
8 SEC.
ACCEL
FIGURE 6A – ACCEL TRIMPOT ADJUSTMENT
5 SEC.
8 SEC.
DECEL
FACTORY SETTING 2 SEC.
RAPID
0.2 SEC.
10 SEC.
SLOW
FIGURE 6B – DECEL TRIMPOT ADJUSTMENT
Note: If only an AC ammeter is available, it can be installed in series with AC input
line. Follow above instructions; however, set AC amperage at 0. 5 motor rating.
F. IR Compensa ion Adjus men – IR compensation is provided to improve load regulation.
If the load presented to the motor does not vary substantially, the IR adjustment may be
set at a minimum level (approximately 1/4 of full setting). The control is factory adjusted
to approximately 3% regulation. If superior performance is needed (less than 1% speed
change of base speed from 0 - full load), then the IR Comp. should be adjusted as fol-
lows:
Note: Excessive IR Comp. will cause control to become unstable, which causes motor
cogging.
1. Set IR Comp. trimpot at approximately 25% of CW rotation. Run motor unloaded at
approximately 1/3 speed and record RPM.
2. Run motor with maximum load and adjust IR Comp. trimpot so that the motor speed
under load equals the unloaded speed per step 1.
3. Remove load and recheck unloaded RPM. If unloaded RPM has shifted, repeat pro-
cedure for more exact regulation.
The control is now compensated to provide minimal speed change under large varia-
tions of applied load.
10
11
MAX MIN
P2
P3
P1
I1
I2
ACCEL
DECEL
L1
T
L2
B
F+
F1
SW6
BLU
LINEARM
A+
L1 L2 A-
TB1
F2
IRCL
F-
WHT
SW3
180V90V
J2
BLUE (L2)
N/ FF SWITCH
WHITE (L1)
WHITE (SW3)
BLUE (SW6)
RANGE (P2)
VI LET (P3)
WHITE (P1)
MAIN SPEED P TENTI METER
ENCL SURE C VER GR UND SCREW
ENCL SURE BASE
LINE FUSE
(FACT RY INSTALLED)
(CUST MER INSTALLED)
ARMATURE FUSE
PLUG-IN
H RSEP WER RESIST R
(CUST MER INSTALLED)
N KBWM-240 NLY
J2 IS INSTALLED
CL LED
FIGURE 7 – INTERNAL CONNECTION DIAGRAM
– NOTES –
12
– NOTES –
13
VII. 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 guaran-
tee, expressed or implied. KB Electronics, Inc. is not responsible for any expense, including
installation and removal, inconvenience, or consequential damage, including injury to any per-
son, 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)
(A40275) – Rev. C – 6/2001
KB Elec ronics, Inc.
12095 NW 39th Street, Coral Springs, FL 33065-2516 • (954) 346-4900 • Fax (954) 346-3377
www.kbelectronics.com
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