53
DANGER
SERVICING IS DONE WITH POWER ON. EXERCISE EXTREME CARE AS HAZ
ARDOUS VOLTAGE EXISTS. FAILURE TO OBSERVE THIS PRECAUTION
COULD RESULT IN SEVERE BODILY INJURY OR LOSS OF LIFE.
Table 52. Servicing Steps.
Indication
Possible Cause
Corrective Action
Controller incoming
line fuse blows
when power is ap
plied to the control
ler.
Faulty incoming AC line wir
ing or an inadvertent ground
in the branch circuit or within
the controller enclosure.
Check all incoming AC wires
and terminations to and
within the controller. Correct
any faulty wiring and remove
any grounds. Replace blown
fuse.
Controller incoming
line fuse blows
when Start com
mand is given
Motor armature shorted or
grounded.
Repair or replace motor. Re
place blown fuse.
Motor does
not rotate.
Faulty, incorrect or grounded
wiring.
Check all external wires and
terminations at the controller.
Check all wiring within the mo
tor conduit box. Correct any
faulty wiring.
Incoming line fuse blown and/
or upstream protection de
vices open.
Investigate upstream equip
ment for possible cause and
correct. Replace blown fuse.
Shorted SCR or faulty regulator
Replace entire controller.
Sudden, severe application of
overload to the motor.
Investigate driven equipment
for possible cause and cor
rect. Replace blown fuse.
Circuit board faulty.
Replace entire controller.
Loose or corroded connection
or faulty, incorrect or
grounded wiring.
Check that all connections
and wiring between the line,
controller and motor are cor
rect. Replace blown fuse.
Open or faulty manual speed
or torque potentiometer.
Check all speed or torque
pot wiring and the operation
of speed or torque poten
tiometer. Correct.
With Process Control models;
faulty, misconnected or mis
calibrated reference signal.
Check automatic reference
signal for presence and
value. Check for proper po
larity. Check jumper for
proper calibration. Correct as
necessary.
Shorted SCR or faulty regulator
Replace entire controller.
Summary of Contents for DC2 VS series
Page 1: ......
Page 2: ......
Page 3: ......
Page 4: ......
Page 5: ......
Page 31: ...3 16 419 519 TB2 Motor Mounted D C Tachometer Figure 3 8 D C Tachometer Connection...
Page 48: ...5 6 Figure 5 1 Wiring Diagram of Basic Speed Controller 0 57210 30...
Page 49: ...5 7...
Page 51: ...5 9 J4...
