KB Electronics KBWS-12 User manual

INSTALLATION AND OPERATING INSTRUCTIONS
KBWS WHISPER DRIVE
PULSE WIDTH MODULATED (PWM)
!
See Safety Warnin on Pa e 5 before
installin and operatin this control
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.
DC Motor Speed Control with Built-In
Input Si nal Isolation
See Table 1 on page 10 for a list of KBWS
Models covered by this manual
TM
A COMPLETE LINE OF MOTOR DRIVES © 2001 KB Electronics, Inc.
Hi-Pot
Tested
1500 VAC
Note: A PLu -In Horsepower Resistor®
must be installed for this product to
operate (supplied separately).

TABLE OF CONTENTS
Section Pa e
i. Simplified Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ii. Safety Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
I. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
II. Plug-In Horsepower Resistor® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
III. Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
IV. Setting Selectable Jumper (On Dual Voltage Models) . . . . . . . . . . . . . . . . . . . 15
V. Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
VI. Recommended High Voltage Dielectric Withstand Testing (Hi-Pot Testing) . . . . 16
VII. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
VIII. AC Line Fusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IX. Trimpot Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
X. Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
XI. Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
XII. Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Tables
1. Electrical Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2. General Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3. Plug-In Horsepower Resistor®Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. Recommended AC Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ii

Fi ures Pa es
1. Control Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2A. Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2B. Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3. Plug-In Horsepower Resistor®. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5. Main Speed Potentiometer Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Voltage Following Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Inhibit Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8. Enable Circuit Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Motor Voltage Selection (J1) (Dual Voltage Models) . . . . . . . . . . . . . . . . . . . . . 15
10. Hi-Pot Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11. Maximum Speed Trimpot (MAX) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12. Minimum Speed Trimpot (MIN) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
13. Acceleration Trimpot (ACC) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
14. Deceleration Trimpot (DEC) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
15. Current Limit Trimpot (CL) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
16. IR Compensation Trimpot (IR) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
iii

i. SIMPLIFIED OPERATING INSTRUCTIONS
IMPORTANT – You must read these simplified operating instructions before proceed-
ing. 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 5 before proceeding. See Application Note, Section VII, on page 18.
A. Power Connection – Connect the AC line to L1 and L2 terminals, as shown in
Figure 4, on page 13 and as described in Section IIIA, on page 13.
B. Permanent Ma net (PM) Motor Connection (Two Wire Type) – Connect the
motor armature to terminals A+ and A- as shown in Figure 4, on page 13 and as
described in Section IIIB, on page 13. On dual voltage models, be sure that
Jumper J1 is set to the corresponding motor voltage position, as described in
Section IV, on page 15.
C. Plu -In Horsepower Resistor® – Install the proper Plug-In Horsepower
Resistor®(supplied separately) according to motor current and horsepower.
See Table 3, on page 12.
D. Trimpot Settin s – All trimpots have been factory set, as shown in Figure 1, on
page 8. Trimpots may be readjusted, as described in Section IX, on page 18.
E. Dia nostic LEDs – After power has been applied, observe the LEDs to verify
proper control function, as described in Section X, on page 22.
4
This product complies with all CE directives pertinent at the time of manufac-
ture. Contact the Sales Department for detailed installation and Declaration of
Conformity. Installation of a CE approved RFI filter (KBRF-300 [P/N 9484] or equiva-
lent) is required. Additional shielded motor cable and/or AC line cables may also be
required.

5
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
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 (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 further information is required on this product, con-
tact the Sales Department.
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.
This control does not contain protection circuitry to prevent full speed runaway in
the event of main power transistor failure. However, an optional Product Safety
Module (PSM) (P/N 9995) can be installed to prevent full speed runaway. If a PSM is
not used, the installer of this product should take proper precautions to include other
means, such as mechanical disconnects, warning notices, etc., to protect the operator
of the machine involved.
It is the responsibility of the equipment manufacturer and individual installer to sup-
ply this Safety Warning to the ultimate end user of this product. (SW effective 1/2001).
!

I. INTRODUCTION
Thank you for purchasing the KBWS. KB Electronics, Inc. is committed to providing
total customer satisfaction by producing quality products that are easy to install and
operate. The KBWS is manufactured with surface mount components incorporating
advanced circuitry and technology.
The KBWS PWM (pulse width modulated) controls are designed to operate PWM
and SCR rated Permanent Magnet motors ranging from 1/50 HP to 11⁄2HP. They
operate at a switching frequency greater than 16 kHz to provide high motor efficien-
cy and quiet operation. Another advantage of PWM is higher output voltage (up to
130 Volts DC for 115 Volt AC line and 220 Volts DC for 208/230 Volt AC line) which
provides increased motor speed.
The KBWS contains pulse-by-pulse current sensing, which provides short circuit
protection and prevents control damage due to commutator arcing. Permanent
magnet motor demagnetization is completely eliminated because current peaks are
reduced to safe levels. The controls contain anAC inrush current limiter (ICL) which
reduces the AC line surge current during cycling of the AC line.
Standard features of the KBWS include diagnostic LEDs for Power On and Current
Limit indication. Other features include adjustable trimpots for maximum speed,
minimum speed, acceleration, deceleration, current limit and IR compensation. Also
provided is a connector for an Inhibit Switch and quick-connect terminals forAC line,
motor armature and Main Speed Potentiometer. The KBWS can be operated from
a two wire start/stop circuit or can be started from the AC line.
Due to its user-friendly design, the KBWS can be easily tailored to specific applica-
tions. See Table 1 on page 10, for electrical ratings. The Plug-In Horsepower
Resistor®matches the motor characteristics to the control without having to recali-
brate the Current Limit (CL) and IR Compensation (IR) trimpots. Therefore, for most
applications, no adjustments are necessary.
6

The KBWS contains built-in isolation for all signal inputs. This includes input signal
voltage, Main Speed Potentiometer terminals, Inhibit Circuit and +5VDC power sup-
ply. The dual voltage models contain a jumper to select motor voltage and special
circuitry which automatically accepts AC Line input voltages of 115 or 208/230 Volts
AC without having to make a jumper selection. See Application Note, Section VII,
on page 18.
Optional accessories for the KBWS include a DIN Rail Mounting Kit, a Product
Safety Module (PSM) and an AC Line Fuse Kit. See Section XI, on page 23.
STANDARD FEATURES
A. Plu -In Horsepower Resistor® – Automatically calibrates IR Compensation and
Current Limit.
B. Dia nostic LEDs – Power On (PWR ON) and Current Limit (CL).
C. Short Circuit Protection – Protects the control from a short circuit at the motor.
D. Isolated Si nal Input Circuit – Eliminates the need for an external signal isolator.
E. Protection Features – Undervoltage protection. MOV input transient protection.
AC Inrush current limit protection.
F. Inhibit Circuit – Provides electronic coast-to-stop.
G. Auto AC Line Select – Control automatically adjusts for 115 or 208/230 VoltAC line
input (dual voltage models).
H. Motor Volta e Selection – Allows motor voltage to be set to 90/130 or 180 Volts DC
(dual voltage models).
7

8
Plug-In
Horsepower
Resistor®
(Supplied Separately)
KBWS
180V 90V
A+A-
L1
L2
CL
PWR ON
J1
P3 P2 P1
CON1
IRCLDECMIN ACCMAX
FIGURE 1 – CONTROL LAYOUT
(Illustrates Factory Setting of Jumpers and Approximate Trimpot Settings)

9
KBWS
180V 90V
A+A-
L1
L2
CL
PWR ON
J1
P3 P2 P1
CON1
IRCLDECMIN ACC
MAX
2.98
[75.8]
1.23
[31.4]
0.48
[12.3]
4.30
[109.2]
3.62
[92.1]
3.80
[96.5]
FIGURE 2A – MECHANICAL SPECIFICATIONS (Inches / [mm])

10
[55.5]
2.19
[50.5]
1.99
2.19
[55.5]
KBWS-12:
KBWS-15:
KBWS-22D:
KBWS-25D:
8 PLACES
Ø0.19
[Ø4.83]
3.17
[80.5]
1.25
[31.8]0.95
[24.1]
3.80
96.5
FIGURE 2B – MECHANICAL SPECIFICATIONS (Inches / [mm])
PWM Rated
Motors
1/3, (0.25)
Maximum Horsepower
Ratin HP, (kW)
SCR Rated
Motors
Model Part
No.
AC Line Input Volta e
(±10%, 50/60 Hz)
(Sin le Phase Volts AC)
Motor
Volta e
(Volts DC)
Maximum
AC Line
Current
(Amps AC)
Maximum
Load
Current
(Amps DC)
KBWS-12
KBWS-15
KBWS-22D*
KBWS-25D*
3/4, (0.5)
9490
9491
9492
9493
115
115
115
208/230
208/230
115
208/230
208/230
0 - 90, 130
0 - 90, 130
0 - 90, 130
0 - 180, 220
0 - 90, 130
0 - 90, 130
0 - 90, 130
0 - 180, 220
4.0
3/4, (0.5)
8.0
4.0
4.0
4.0
8.0
8.0
8.0
2.5
5.0
2.5
2.5
2.5
5.0
5.0
5.0
1/4, (0.18)
1/2, (0.37)
1/4, (0.18)
1/2, (0.37)
1/4, (0.18)
1/2, (0.37)
1, (0.75)
1/2, (0.37)
3/4, (0.5)
1/3, (0.25)
3/4, (0.5)
1/3, (0.25)
11⁄2, (1)
TABLE 1 – ELECTRICAL RATING
* See Sections 1G and 1H on page 7.

11
II. PLUG-IN HORSEPOWER RESISTOR®
A Plug-In Horsepower Resistor®(PHR) must be
installed for the KBWS to operate. Select a Plug-
In Horsepower Resistor®to match the motor
characteristics to the control. See Figure 3 and
Table 3 on page 12. The PHR plugs into the two
female terminals that are provided on the KBWS.
Plug-In Horsepower Resistors®are supplied
separately by your distributor.
—
Parameter Specification Factory Settin
AC Line Voltage Regulation (% Base Speed) 0.5 —
Armature Voltage Range at 115 Volt AC Line Input (Volts DC)
Armature Voltage Range at 208/230 Volt AC Line Input (Volts DC)
Maximum Load Capacity (% for 2 Minutes)
Switching Frequency at Motor (kHz)
Signal Following Input Voltage Range (Volts DC)
Maximum Speed Trimpot (MAX) Range (% Base Speed)
Minimum Speed Trimpot (MIN) Range (% Base Speed)
Acceleration Trimpot (ACC) Range (Seconds)
Deceleration Trimpot (DEC) Range (Seconds)
Current Limit Trimpot (CL) Range (% Full Load)
IR Compensation Trimpot (IR) Range at 90/130 Volts DC Output (Volts DC)
IR Compensation Trimpot (IR) Range at 180/220 Volts DC Output (Volts DC)
Speed Regulation (50:1 Speed Range) (% Base Speed)
Speed Range (Ratio)
Operating Temperature Range (ºC)
0 –130 90
0 –130, 0 –220 180
150 —
>16 —
0 –5
70 –100 100
0 –30 0
0.2 –10 1
0.2 –10 1
0 –200 150
0 –10 —
0 –20 10
1—
50:1 —
0 –45 —
TABLE 2 – GENERAL PERFORMANCE SPECIFICATIONS
FIGURE 3 – PLUG-IN
HORSEPOWER RESISTOR®
CAUTION: Be
sure Plu -In
Horsepower
Resistor® is
inserted com-
pletely into
matin sockets.

12
Note: Disconnect main power when installing or changing the Plug-In
Horsepower Resistor®.
III. WIRING INSTRUCTIONS
Warnin ! Read Safety Warning, on page 5 before using this control.
Disconnect the AC line before wiring.
Note: To avoid erratic operation, do not bundle AC line and motor wires with wires
from signal following, Start/Stop Switch, Enable, or any other signal wires. Use
shielded cables on all signal wiring over 12”(30cm). Shield should be earth ground-
ed on the control side only. Wire the control in accordance with the National
Electrical Code requirements and other codes that may apply to your area. See
Figure 4 on page 13.
Be sure to properly fuse each conductor that is not at ground potential. Do not fuse
neutral or grounded conductors. See Section VIII, on page 18. A separate AC line
switch or contactor must be wired as a disconnect so that each ungrounded con-
ductor is opened. See Application Note, Section VII, on page 18.
0.18
SCR Rated Motor
Horsepower Ran es (HP)
PWM Rated Motor
Horsepower Ran es (HP)
Motor
Current
(Amps DC)
9836
3.3 –5.0
Plu -In
Horsepower Resistor®
90 Volt DC 180 Volt DC 130 Volt DC 200 Volt DC ΩPart No.
9949
1/3 –1/2
1/4
0.1
0.25
0.51
1
2.0
9838
9837
9834
9833
3/4 –1
1/100 –1/50
1/2
1/15 –1/10
1/8 –1/6
1/30 –1/20
1/4 –1/3
1/6 –1/5
1/15 –1/10
1/50 –1/25
1/2 –3/4
1/3
1/6 –1/4
1/12 –1/8
1/20 –1/15
1/50 –1/30
1 –11⁄2
3/4
1/3 –1/2
1/6 –1/4
1/8 –1/6
1/25 –1/20
2.5
1.3 –2.0
0.7 –1.0
0.4 –0.6
0.1 –0.3
TABLE 3 – PLUG-IN HORSEPOWER RESISTOR® SELECTION
Notes: 1) 1 HP = 0.75 kW. 2)The HP marking on the Plug-In Horsepower Resistor®does not apply to PWM controls.
!
CL Settin
(Amps DC)
0.5
7.5
3.8
3.0
1.5
0.9
!

Warnin ! Do not wire switches or relays in
series with the armature. Armature switching
can cause catastrophic failure of motor and/or control.
A. AC Line Connection – Wire the AC line to L1
and L2 terminals, as shown in Figure 4.
B. Permanent Ma net (PM) Motor Connection –
Wire the motor armature leads to A+ and A- termi-
nals, as shown in Figure 4. On dual voltage mod-
els, be sure that Jumper J1 is set to the corre-
sponding motor voltage. Be sure that the correct
Plug-In Horsepower Resistor®is installed (see
Table 3, on page 12). Note: If the motor runs in
the opposite direction than is desired,
disconnect power and reverse the motor
leads.
C. Main Speed Potentiometer
Connection – The control is supplied
with a Main Speed Potentiometer.
Connect the Main Speed Potentiometer
high side to P3 terminal, wiper to P2
terminal and low side to P1 terminal, as
shown in Figure 5. Rotating the Main Speed Potentiometer clockwise will
increase motor speed. Rotating the Main Speed Potentiometer counterclock-
wise will decrease motor speed.
D. Volta e Followin Connection – A 0 - 5 Volt DC analog signal voltage can
also be used to control motor speed. See Figure 6, on page 14. Connect the
13
!MOTOR
+
–
AC LINE
A- A+
L1
L2
FIGURE 4 – POWER
CONNECTIONS
P3 P2 P1
WIPER (ORANGE)
HIGH (VILOET)
MAIN SPEED
POTENTIOMETER
(FRONT VIEW)
LOW (WHITE)
FIGURE 5 – MAIN SPEED
POTENTIOMETER CONNECTION

analog signal voltage to P2 (signal) and P1 (-) ter-
minals. Adjustment of the MIN trimpot may be
necessary to achieve a 0 Volt DC output with a
0 Volt DC input.
Note: The input signal can be non-isolated or
earth grounded since the KBWS has built-in sig-
nal isolation.
E. Inhibit Circuit Connection – The
control is supplied with an inhibit con-
nector (CON1). See Figure 7. This
circuit is used to electronically stop
the control. When the Inhibit Switch is
closed, the control will coast-to-stop.
When the Inhibit Switch is opened,
the control will accelerate to the Main
Speed Potentiometer setting.
F. Enable Circuit Connection – The
control can also be started and
stopped with an Enable Circuit
(close to start). See Figure 8. The
Enable function is established by
wiring a switch in series with the
high side of the Main Speed
Potentiometer lead which connects
to the P3 terminal. When the
Enable switch is closed, the control
will accelerate to the Main Speed
14
P3 P1P2
0 - 5V DC
SIGCOM
FIGURE 6 – VOLTAGE
FOLLOWING CONNECTION
P3 P2 P1
WIPER (ORANGE)
HIGH (VILOET)
MAIN SPEED
POTENTIOMETER
(FRONT VIEW)
LOW (WHITE)
(CLOSE TO START)
SWITCH OR RELAY
ENABLE
FIGURE 8 – ENABLE CIRCUIT
CONNECTION
CON1
INHIBIT
SWITCH OR RELAY
(OPEN TO RUN)
FIGURE 7 – INHIBIT CONNECTION

Potentiometer setting. When the Enable Switch is opened, the control will coast
to the minimum speed setting.
Warnin ! Do not use Enable as a safety disconnect. Use only theAC line
for this purpose.
IV. SETTING SELECTABLE JUMPER (ON DUAL
VOLTAGE MODELS)
All dual voltage KBWS models contain a
selectable jumper which must be set before
the control can be used. See Figure 1, on
page 8, for the location of Jumper J1.
Motor Voltage Selection (J1): Jumper J1 is
factory set to the “180V”position for 180 Volt
motors. For 90 or 130 Volt motors, set Jumper
J1 to the “90V”position. See Figure 9.
V. MOUNTING INSTRUCTIONS
It is recommended that the control be mounted on a flat surface with adequate ven-
tilation. If the control is mounted in a closed, unventilated location, a minimum of a
12”x 12”x 12”enclosure should be used to allow for proper heat dissipation. The
maximum allowable ambient temperature at full rating is 45 ºC (113 ºF).
Care should be taken to avoid extreme hazardous locations where physical damage
can occur or where the control will be exposed to contaminants such as water, metal
chips, solvents or excessive vibration. Leave enough room around the control to
allow for AC line, motor connections and any other wiring. See Figures 2A and 2B,
on pages 9 and 10.
15
!
J1 Set for
180 Volt Motor
(Factory Settin )
J1 Set for
90 Volt Motor
J1
90V80V
J1
90V180V
FIGURE 9 – MOTOR
VOLTAGE SELECTION

VI. RECOMMENDED HIGH VOLTAGE DIELECTRIC WITHSTAND TESTING (Hi-Pot Testin )
Note: This control has been Hi-Pot tested at 1500 Volts AC.
Testing agencies such as UL, CSA, VDE, etc., usually require that equipment under-
go a hi-pot test. In order to prevent catastrophic damage to the speed control, which
has been installed in the equipment, it is recommended that the following procedure
be followed. Figure 10, on page 17 shows a typical hi-pot test setup.
Note: All equipment AC line inputs must be disconnected from the AC power.
A. Connect all equipment AC power input lines together and connect them to the
H. V. lead of the hi-pot tester. Connect the RETURN lead of the hi-pot tester to
the frame on which the control and other auxiliary equipment are mounted.
B. The hi-pot tester must have an automatic ramp-up to the test voltage and an
automatic ramp-down to zero voltage.
Note: If the hi-pot tester does not have automatic ramping, then the hi-pot out-
put must be manually increased to the test voltage and then manually reduced
to zero. This procedure must be followed for each machine tested. A suggest-
ed hi-pot tester is Slaughter Model 2550.
WARNING! Instantaneously applyin the hi-pot volta e will cause
irreversible dama e to the speed control.
C. The hi-pot test voltage should be set in accordance to the testing agency stan-
dards and the leakage current should be set as low as possible without causing
nuisance trips.
D. To eliminate motor speed control damage due to auxiliary equipment hi-pot fail-
ure, it is also recommended that all signal inputs be wired together and con-
nected to the AC input lines as shown.
16
!

17
21
30
AC KILOVOLTS
RETURN
H. V.
(MAIN POWER DISCONNECTED)
TERMINALS TOGETHER
CONNECT ALL SPEED CONTROL
HIGH VOLTAGE DIELECTRIC WITHSTAND TESTER
MOTOR SPEED CONTROL
(HI-POT TESTER)
SIGNAL INPUTS
TERMINALS
L1
L2
FRAME
CHASSISCHASSIS
MOTOR MOTOR WIRES
AC LINE INPUTS
RESET
TEST
TO BOTH
CONNECT HI-POT
AC LINE INPUT
LEAKAGE
0mA 10mA
MAX
ZERO
VOLTAGE
AUXILIARY EQUIPMENT
MACHINE OR EQUIPMENT FRAME
L1
L2
P1
P2
P3
FIGURE 10 – HI-POT TEST SETUP

VII. OPERATION.
(You must read the Safety Warnin on pa e 5 before proceedin ).
After the KBWS has been properly setup, the startup procedure can begin. IfAC power
has been properly brought to the control, the PWR ON LED will illuminate green. Before
starting, be sure that the Main Speed Potentiometer is set to the zero speed position.
The motor should begin to run as the Main Speed Potentiometer is rotated clockwise.
Note: If the motor runs in the incorrect direction, it will be necessary to disconnect
the AC line, reverse the motor leads and repeat the startup procedure.
VIII.AC LINE FUSING
The KBWS does not contain AC line fuses.
Most electrical codes require that each
ungrounded conductor contain circuit protec-
tion. It is recommended to install a fuse
(Littelfuse 326, BUSS ABC or equivalent) or a
circuit breaker in series with each unground-
ed conductor. An AC Line Fuse Kit (P/N
9851) is available. Check all electrical codes
that apply to the application. See Table 4.
IX. TRIMPOT ADJUSTMENTS
The KBWS contains trimpots which are factory set for most applications. Figure 1,
on page 8 illustrates the location of the trimpots and their approximate calibrated
positions. Some applications may require readjustment of the trimpots in order to
tailor the control for a specific requirement. Readjust trimpots as described below.
18
5
Model Recommended AC Line
Fuse (Amps RMS)
KBWS-12
KBWS-15
KBWS-22D
KBWS-25D 10
5
10
TABLE 4 – RECOMMENDED
AC LINE FUSE
Application Note: This control is not recommended for applications where
the AC line is to be rapidly cycled on and off.

Warnin ! If possible, do not adjust trimpots with main power
applied. If adjustments are made with main power applied, an insu-
lated adjustment tool must be used and safety lasses must be worn. Hi h
volta e exists in this control. Fire and/or electrocution can result if caution is
not exercised. Safety Warnin , on pa e 5, must be read and understood
before proceedin .
A. Maximum Speed (MAX) – Sets the maxi-
mum speed of the motor. The MAX trimpot
is factory set for 100% of base motor speed.
For a higher maximum speed setting, rotate
the MAX trimpot clockwise. For a lower
maximum speed setting, rotate the MAX
trimpot counterclockwise. See Figure 11.
To Calibrate the MAX Trimpot:
1. Adjust the MAX trimpot to the desired
position and set the Main Speed
Potentiometer for full output voltage.
2. Monitor the armature voltage and readjust the
MAX trimpot to the desired voltage.
B. Minimum Speed (MIN) – Sets the minimum speed
of the motor. The MIN trimpot is factory set for 0%
of base motor speed. For a higher minimum speed
setting, rotate the MIN trimpot clockwise. See
Figure 12.
19
110
120
150
PERCENT OF BASE SPEED FOR SCR RATED MOTORS
70
100
(SHOWN FACTORY SET TO 100%)
FIGURE 11 – MAX
TRIMPOT RANGE
15
0
522
30
PERCENT OF BASE SPEED
(SHOWN FACTORY SET TO 0%)
FIGURE 12 – MIN
TRIMPOT RANGE
!

To Calibrate the MIN Trimpot:
1. Adjust the MIN trimpot to the desired position
and set the Main Speed Potentiometer fully
counterclockwise.
2. Monitor the armature voltage and readjust the
MIN trimpot to the desired voltage.
C. Acceleration (ACC) – Sets the amount of time it
takes for the control voltage to reach full output.
The ACC trimpot is factory set to 1 second. To
increase the acceleration time, rotate theACC trim-
pot clockwise. To decrease the acceleration time,
rotate the ACC trimpot counterclockwise. See
Figure 13.
D. Deceleration (DEC) – Sets the amount of time it
takes for the control voltage to reach zero. The
DEC trimpot is factory set to 1 second. To increase
he deceleration time, rotate the DEC trimpot clock-
wise. To decrease the deceleration time, rotate the
DEC trimpot counterclockwise. See Figure 14.
E. Current Limit (CL) – Sets the current limit (over-
load), which limits the maximum current to the
motor. The CL trimpot is factory set to 150% of the
nominal motor current established by the Plug-In
Horsepower Resistor®. See Table 3, on page 12.
To increase the current limit, rotate the CL trimpot
clockwise. To decrease the current limit, rotate the
CL trimpot counterclockwise. See Figure 15.
20
5
2.5 7.5
0.2
SECONDS
(SHOWN FACTORY SET TO 1 SECOND)
10
1
FIGURE 14 – DEC
TRIMPOT RANGE
100
200
150
0
50
(SHOWN FACTORY SET TO 150%)
PERCENT OF RANGE SETTING
FIGURE 15 – CL
TRIMPOT RANGE
7.5
5
10
2.5
1
0.2
(SHOWN FACTORY SET TO 1 SECOND)
SECONDS
FIGURE 13 – ACC
TRIMPOT RANGE