9.4 Errors And Remedial Actions Of The 3Rw55 And 3Rw55 Failsafe Soft Starters - Siemens SIRIUS 3RW55 Equipment Manual

Messages and diagnostics

9.4 Errors and remedial actions of the 3RW55 and 3RW55 Failsafe soft starters

Warning
Active power limit - maintenance de‐
manded exceeded
Active power limit - maintenance de‐
manded undershot
Starting time limit - maintenance de‐
manded exceeded
Starting time limit - maintenance de‐
manded undershot
Not for 3RW55 Failsafe soft starter.
1)
9.4 Errors and remedial actions of the 3RW55 and 3RW55 Failsafe soft
starters
Display of the faults
The 3RW55 and 3RW55 Failsafe soft starters signal errors by means of the following displays:
• "ER" LED (red)
• 3RW5 HMI High Feature
Display of faults on the 3RW5 HMI High Feature
Detailed information about errors and remedial actions appears in plain text on the display of the
3RW5 HMI High Feature.
Errors and remedial actions
Error
Switching element overload
Switching element defective
252
Cause
The active power of the motor has ex‐
ceeded a limit.
The active power of the motor has fallen
below a limit.
The configured maximum starting time
is shorter than the required motor start‐
ing time.
The configured minimum starting time is
longer than the required motor starting
time.
Cause
Contact block (switch contact, power
semiconductors) too hot.
• Switching element defective
• The fault is also generated if the
defective switching element (by‐
pass or power semiconductor)
cannot be accurately identified.
Remedy
Check the application driven by the mo‐
tor.
Prolong the "max. starting time" param‐
eter, increase the current limiting value
or check the load coupled with the motor
for a mechanical defect.
Shorten the "min. starting time" param‐
eter, lower the current limiting value or
check the load coupled with the motor
for a mechanical defect.
Remedy
• Check the ambient conditions associated
with cooling. You may want to consider
lowering the operating characteristics.
• Check the number of switching operations.
• Acknowledgment after cooling down. The
acknowledgment depends on the "Re‐
sponse to overload switching element" pa‐
rameter that has been set.
Check the switching elements L1, L2, and L3
and replace any that are defective.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006