Troubleshooting
S811+ Soft Starter
MN03900001E—November 2012
43
Note:
If connected to a network, starting the S811+ from
the Control Input terminal block may isolate problems
associated with the network and not with the soft
starter.
2.
It is often useful in determining the nature of the fault
condition by noting when the trip occurs during
operation of the S811+ soft starter. The operation of the
S811+ may be categorized into the following periods;
●
The S811+ Soft Starter trips Immediately when the
START command is issued.
●
The S811+ Soft Starter trips during the START ramp
and never reaches bypass.
●
The S811+ Soft Starter trips when the bypass
contactors are closing.
●
The S811+ Soft Starter trips during running operation
while bypass contactors are closed.
●
The S811+ Soft Starter trips after the Stop command
is received.
●
The S811+ Soft Starter stops sooner than expected
during a soft stop. If the
Soft Stop Time
is set too
long for the motor loading (high loads), the motor will
begin to stall when delaying SCR firing reduces the
voltage. The S811+ Soft Starter will detect this
stalling due to the increase in current flow and end
the stop immediately and not indicate any faults.
Refer to the flowchart on
Page 44
to aid in determining the
appropriate corrective action during the various run phases of
operation.
Note:
If no fault codes are present during an unexpected
“trip” of the soft starter, verify that the soft starter did
not receive a STOP command.
Detailed information describing fault codes and
corrective action may be found in
Appendix I
.
Troubleshooting—S811+ Stopped or Faulted
Condition
Possible Problem
Suggested Corrective Action
Status LED is GREEN
Stop command received.
Terminal block wiring not secure.
Loss of 24 Vdc control power.
Transient fault when Reset Mode set to AUTO.
External control device failure.
External mains device failure or trip condition.
Control board failure.
24 Vdc permissive signal lost—investigate control system.
Check control wiring for security.
Check 24 Vdc power source for correct sizing and circuit
connections.
Change Reset Mode to Manual to capture fault condition.
Inspect external control devices for proper operation.
Inspect external devices for condition and proper operation.
Possible device fatal error.
Status LED is RED
Protection/Operation parameters not set to proper values.
Fault condition exists.
Fault not reset from previous trip.
Reset Mode set to Manual.
Determine Fault condition from the Fault History.
Adjust Protection parameter values to prevent recurring fault trips.
Correct problems with mains voltages and/or phase conditions.
Attempt to reset fault—the fault will not reset if the fault
condition exists.
Set Reset Mode to Manual to retain soft starter in fault
condition for troubleshooting. Correct fault condition and
change Reset Mode to Auto if desired.
Set Protection parameters to Warning.
Reset Mode set to Manual and no Reset signal was sent to the
soft starter. Reset soft starter or change Reset Mode to AUTO.
No status LEDs illuminated,
DIM display dark.
No Control Power supply
Device failure.
Provide 24 Vdc to Control power terminal block.
Check Control Power for proper value and reliability.