Control Techniques Focus 3R User Manual page 71

MOTOR RUNS IN WRONG DIRECTION:
A. The Al and A2 output leads to the motor are incorrectly
wired - exchange these leads.
B. On shunt wound motors only the shunt field Fl and F2 leads are incorrectly wired –
exchange these leads.
MOTOR DOES NOT MAINTAIN SPEED UNDER LOAD:
A. IRCOMP potentiometer is set too low - adjust clockwise
H. Motor is overloaded - correct overload condition.
I. Incorrect jumper programming – check jumpers.
J. Defective component on main PC board – replace
K. Current limit set too low – readjust.
L. Motor brushes worn - replace as specified in motor instruction manual.
MOTOR DOES NOT COME TO FULL STOP:
A. Minimum Speed potentiometer (MIN) is set too high -readjust
B. Defective speed or torque potentiometer, component on regulator PC
board, Start/Stop switch, or rectifier cube -replace as required.
(See Critical Components)
NO SPEED CONTROL:
M. Defective rectifier cube - replace as required
N. Defective component on main PC board - replace as required.
Components )
O. Incorrectly wired or defective speed potentiometer - check the wiring.
P. Incorrect jumper programming - check jumper programming.
Q. If the control (after rechecking all the wiring for proper and secure connections) is
still inoperative, make the following voltage checks. Double check to make sure that
armature leads Al and A2 are not grounded.
F. High resistance ground on motor armature
Step Function
1 Voltage to
with AC Rectifiers
Power "on"
2*
Speed
command
3 Field Supply
Voltage
4* Armature
Voltage
*Depends on the setting of the speed adjustment knob
VOLTAGE CHECK CHART
Normal
Voltage
Readings
120 Vac 240 Vac
±10% ± 10%
0 to +10 0 to +10
Vdc Vdc
100 Vdc 200 Vdc
0-90 Vdc 0-1 80 Vdc
(See Critical
(See Critical Components)
(See Critical
Terminal Probable Cause
or Point
ACl
AC2
Blown Fuses
On
power
cube
Defective speed
10-12
adjustment
potentiometer or
circuit board assembly
Defective field diodes
+Fl
defective encapsulated
-F2
bridge rectifier
assembly
Defective encapsulated
+Al
bridge rectifier ass'y, or
-A2
circuit board assembly
Components)
Page 65