Error
Cause
Remedy
No main power
• The mains switch or the power
supply is not plugged in correctly.
• There is no power.
Check the cables and the cable connections
and replace defective components, if necessa‐
ry.
Temperature sensor overload
The temperature of the motor is too
high.
• Check the motor and the application that is
driven by the motor.
• After triggering, the motor can only be
switched on again if the temperature has
reached the release position of the temper‐
ature sensor. The acknowledgment de‐
pends on the "Response to overload tem‐
perature sensor" parameter that has been
set.
Temperature sensor wire break
A wire has broken in the sensor cable
of the temperature sensor.
Check the sensor line and the temperature sen‐
sor.
Temperature sensor short-circuit
A short-circuit has occurred in the
sensor line of the temperature sensor.
Thermal motor model overload
• The motor feeder is overloaded.
• The motor temperature has ex‐
ceeded a limit.
• Check the motor and the applications driv‐
en by the motor.
• You can switch on the motor again after the
cooling-down period has expired or after
deleting the thermal motor model. The ac‐
knowledgment depends on the set "Re‐
sponse to overload thermal motor model".
Motor overload protection - shutoff
Safety-related shutoff
1)
The module has detected a problem
on the channel and has therefore exe‐
cuted a safety-related shutoff. The
possible reason is a discrepancy error.
Check the channel and eliminate the cause.
Asymmetry limit error exceeded
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.
Asymmetry shutoff
Additional tripping in the case of
asymmetry
Current limit error exceeded
The current has exceeded a limit.
Check the application driven by the motor.
Current limit error undershot
The current has undershot a limit.
Current limit error shutoff
Additional tripping in the event of a
current limit error overshoot or un‐
dershoot.
Ground fault limit error exceeded
The ground-fault monitoring has re‐
sponded. An impermissibly high re‐
sidual current is flowing.
Check the connecting cable of the motor for
damage.
Electronics supply voltage too low
The supply voltage is below the per‐
mitted value.
Check the power supply (load rating, voltage
range).
Bus error
Fault in the fieldbus communication.
You will find further information in
the manual for the 3RW5 communi‐
cation module in question.
• Check the bus connection.
• Check the bus parameters.
Messages and diagnostics
9.4 Errors and remedial actions of the 3RW55 and 3RW55 Failsafe soft starters
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
253
