Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 139)

Error Diagnosis and Troubleshooting 8-7
Publication 825-UM001B-EN-P January 2001
Table 8.A Possible Causes and Actions (Continued)
LCD Designation Possible Causes Actions
PTC trip
PTC or PTC leads short-circuited
or broken
Check leads, remove fault. PTC:
Motor for repair. If not possible,
switch off PTC monitoring “PTC
PROT/OFF“.
Stator winding overheated by:
•
Overload
•
Too many starts/hour
• Too many warm starts/hour
• Obstructed cooling
•
High ambient temperature
Wait until motor has cooled down
sufficiently for a reset.
•
Search for cause and
eliminate.
•
Reduce starts/hour.
• Reduce number of warm
starts/hour.
• Clean motor and cooling air
intake.
•
Protect against heat; reduce
load or switch off installation.
Phase
sequence
protection
(motor supply)
Wrong phase sequence of supply
to converter module Connect phase leads in correct
sequence.
Phase failure
trip
(based on
motor supply)
Faulty fuse:
Short-circuit/earth (ground) fault Remedy damage, replace the
fuse.
Failure during start
Redimension fuse (noting
short-circuit coordination).
Broken lead
Check cables and terminal
connections.
PT100 #1…#6
(RTD)
temperature
warning
PT100 #1…#6
(RTD)
temperature
trip
Stator winding overheated by:
• Overload
•
Too many starts/hour
• Too many warm starts/hour
•
Obstructed cooling
•
High ambient temperature
Wait until motor has cooled down
sufficiently to permit reset.
• Search for cause and remedy.
•
Reduce start/hour
• Reduce warm starts/hour
•
Clean motor and cooling air
intake.
•
Protect against heat. Reduce
load or shut down the
installation, and wait until
motor has cooled down
sufficiently for a restart.
PT100 (RTD)
has been
short- or open-
circuited.
This message
may appear
together with a
PT100 #1…#6
(RTD) TRIP
Failure in PT100 (RTD) circuit
Check cables, terminal connection
and PT100 (RTD) sensor
PTC TRIP
PHASE REVER TRIP
PHASE LOSS TRIP
PT100 #…WARNING
PT100 #…TRIP
PT100 SHORT CIRC
PT100 NO CONNECT