Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 137)

Error Diagnosis and Troubleshooting 8-5
Publication 825-UM001B-EN-P January 2001
Table 8.A Possible Causes and Actions (Continued)
LCD Designation Possible Causes Actions
—
Setting of locked rotor current
and/or locked rotor time are
outside the permissible range
Press “Values” until “SET
VALUES” on LCD.
Set “LOCKED ROT CURR” to
6 x
,
e
.
Set “LOCKED ROT TIME” to 10 s.
Set “LOCKED ROT CURR” and
“LOCKED ROT TIME” correctly
within permissible range (refer to
Chapter. 3 ).
Asymmetry
warning
Asymmetry
trip
Mains unbalanced
If asymmetry inadmissibly high,
clarify cause with electric
company.
If asymmetry has values usual for
the area, raise threshold in the
basic unit.
Blown fuse
• Short-circuit/Earth
(ground) fault
•
Failure during starting
• Repair the trouble, replace the
fuse.
•
Redimension fuse (note
short-circuit coordination).
Motors idling (e.g., pumps)
Raise threshold in basic unit to
permissible level.
Poor contacts (terminals,
contactor, breaker, etc.)
Repair trouble.
Phase lead broken (motor lead,
link between basic unit and
converter module)
Replace or repair cable.
Asymmetrical motor winding
If asymmetry is acceptable, raise
threshold in basic unit; otherwise
repair motor.
Main current transformer error
• Metering class current
transformer instead of
protection current
transformer
•
Wrong current range
• Current transformer rating
too low
• Incorrect current transformer
wiring
• Insert the correct current
transformer.
•
Replace the current
transformer.
• Replace the current
transformer.
• Check and correct wiring.
Overcurrent
warning
Overcurrent
trip
Overload
Reduce load or raise pickup
threshold.
Transported material jammed
Switch off installation, remedy
cause.
Pickup threshold set too low Raise pickup threshold.
Mechanical damage to bearings
and transmission system
Repair the damage.
Stalling during start (causes as
for jamming when running) Switch off installation, remedy
cause.
ERROR SET VALUES
AS WARNING
ASYMMETRY TRIP
OC WARNING
OVERCURRENT TRIP