Spectech VARI-DRIVE KBWM-120, Installation And Operating Instructions Manual

Page: 7 / 16

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 Resistor® – (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. Armature 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 1.7 times the DC current rating of the motor. See Table 4.
5
5
90 VDC 180 VDC
Motor Horsepower
Range
Approx.
Motor
Current
(DC Amps)
Fuse
Rating
(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
1 1 ⁄
2
2
3
4
TABLE 4 – ARMATURE FUSE
SELECTION CHART
9840
90 VDC 180 VDC
Motor Horsepower Range
Approx.
Motor Current
(DC Amps)
Plug-in Horsepower
Resistor® Value
(Ohms)
Individual
Plug-in Horsepower®
Resistor Part 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®.