Siemens SIRIUS 3RW55 - Page 178

Messages and diagnostics
8.3 Warnings and remedial measures of the 3RW55 soft starter
SIRIUS 3RW55 soft starter
178 Manual, 08/2018, A5E35630887002A/RS-AB/002
Warning
Cause
Remedy
Asymmetry A limit for asymmetry has been ex
ceeded.
Asymmetry can cause an overload.
Possible causes:
• Phase failure
• Fault in the motor windings
Check the motor feeder and the motor.
Ground fault The ground-fault monitoring has
responded. An impermissibly high
residual current is flowing.
Check the connecting cable of the
motor for damage.
Number of starting operations
exceeded
The maximum number of starting
operations in the monitoring period has
been exceeded.
The next starting operation should take
place only after the interlock time has
expired.
Error rotating field The direction of rotation field is not
correct.
-
Internal fan error
• Fan is dirty (not rotating freely)
• Fan defective
Check the function of the fan:
• Clean the fan
• Check the wiring
• Replace the fan
Overvoltage The supply voltage is above the tolerance
limit.
Change the power supply.
Above threshold P The active power of the motor has
exceeded a limit.
Check the application driven by the
motor.
Below threshold P The active power of the motor has fallen
below a limit.
Ramp up time exceeded The configured maximum starting time is
shorter than the required motor starting
time.
Prolong the "max. starting time"
parameter, increase the current limiting
value or check the load coupled with
the motor for a mechanical defect.
Ramp up time underrun The configured minimum starting time is
longer than the required motor starting
time.
Shorten the "min. starting time"
parameter, lower the current limiting
value or check the load coupled with
the motor for a mechanical defect.