KB Electronics KBPC-240D User Manual

Page 16

FIG. 15 – ENABLE CIRCUIT

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

1/6

1/3

1.7

1/4

1/2

2.5

1/3

3/4

3.3

1/2

5.0

3/4

7.5

10.0

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

This manual is related to the following products:

KBCC-240D