Control Techniques Emerson Focus 1 User Manual

Page 57
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
B. Motor is overloaded - correct overload condition.
C. Incorrect jumper programming – check jumpers.
D. Defective component on main PC board – replace (See Critical Components)
E. 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:
F. Defective rectifier cube - replace as required (See Critical Components)
G. Defective component on main PC board - replace as required.
(See Critical Components )
H. Incorrectly wired or defective speed potentiometer - check the wiring.
I. Incorrect jumper programming - check jumper programming.
J. 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.
K. High resistance ground on motor armature
VOLTAGE CHECK CHART
Step Function
Normal
Voltage
Readings
Terminal
or Point
Probable Cause
1
with AC
Power “on”
Voltage to
Rectifiers
120 Vac 240 Vac
±10% ± 10%
ACl
AC2
On
power
cube
Blown Fuses
2*
Speed
command
0 to +10 0 to +10
Vdc Vdc
10-12
Defective speed
adjustment
potentiometer or
circuit board assembly
3 Field Supply
Voltage
100 Vdc 200 Vdc
+Fl
-F2
Defective field diodes
defective encapsulated
bridge rectifier
assembly
4* Armature
Voltage
0-90 Vdc 0-1 80 Vdc
+Al
-A2
Defective encapsulated
bridge rectifier ass’y, or
circuit board assembly
*Depends on the setting of the speed adjustment knob

Control Techniques Emerson Focus 1 Specifications

General

Brand	Control Techniques
Model	Emerson Focus 1
Category	DC Drives
Language	English