KB Electronics KBMM-225D User Manual
Page 21
21
An AC Line Fuse (supplied separately) must be installed
in the AC line Fuse Holder and an Armature Fuse (sup-
plied separately) must be installed in the Armature Fuse
Holder, as shown in Figure 1, on page 10. Select the
correct fuses, as shown in Table 5.
8.1
AC Line Fuse – The AC Line Fuse protects the
control against catastrophic failure. If the AC Line
Fuse blows, the control is miswired, the motor is
shorted or grounded, or the control is defective.
Note: Fuse each AC line conductor that is not at
ground potential.
8.2
Armature Fuse – The Armature Fuse provides
overload protection for the motor and control. The
Armature Fuse required can be calculated by multi-
plying the maximum DC Motor Current times 1.7.
9
PLUG-IN HORSEPOWER RESISTOR®
Plug-In Horsepower Resistor® – A Plug-In Horsepower Resistor® (supplied separately) must be installed to
match the control to the motor horsepower and voltage. Plug-In Horsepower Resistors® are available from your
distributor. Install the Plug-In Horsepower Resistor®, as shown in Figure 1, on page 10. Select the correct Plug-In
Horsepower Resistor® as shown in Table 6, on page 22.
Application Notes: 1. The Plug-In Horsepower Resistor® is used to calibrate the IR Compensation and Current
Limit based on motor horsepower and voltage. The Plug-In Horsepower Resistor® eliminates the need to recali-
brate IR Compensation and Current Limit in most applications. 2. Be sure the Plug-In Horsepower Resistor® is
inserted completely into the mating sockets.
90 - 130 Volt
DC Motors
(HP)
180 Volt
DC Motors
(HP)
Recommended Fuse Rating
(Amps)
AC Line
Armature
1/100 – 1/50
1/50 – 1/25
12
1/3
1/50 – 1/30
1/25 – 1/15
12
1/2
1/30 – 1/20
1/15 – 1/10
12
3/4
1/20 – 1/12
1/10 – 1/6
12
1
1
⁄
4
1/12 – 1/8
1/6 – 1/4
12
2
1/8 – 1/5
1/4 – 1/3
12
2
1
⁄
2
1/4
1/2
12
4
1/3
3/4
12
5
1/2
1
12
8
3/4
1
1
⁄
2
12
12
1*
2*
15
15
1
1
⁄
2
*
3*
25
25
TABLE 5 – AC LINE & ARMATURE FUSE SELECTION