Siemens SIRIUS 3RW55 - 8.4 Faults and Remedial Actions

Messages and diagnostics
8.4 Faults and remedial actions of the 3RW55 soft starter
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
179
8.4
Faults and remedial actions of the 3RW55 soft starter
Faults
Cause
Remedy
Switching element overload Switching element (switch contact, power
semiconductors) too hot.
• 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
Power semiconductor defective - Check the power semiconductors L1,
L2 and L3 and replace any that are
defective.
Supply voltage missing
• 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 necessary.
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 temperature
sensor.
Temperature sensor wire break A wire has broken in the sensor cable of the
temperature sensor.
Check the sensor line and the
temperature sensor.
Temperature sensor short-circuit A short-
circuit has occurred in the sensor line
of the temperature sensor.
Therm. motor model overload
• The motor feeder is overloaded.
• The motor temperature has exceeded a
limit.
• Check the motor and the
applications driven by the motor.
• You can switch on the motor again
after the cooling-off period has
expired or after deleting the thermal
motor model.
Motor overload tripping
• The motor feeder has been overloaded
• The temperature rise of the motor has
exceeded a limit value.
• Check the motor and the
applications driven by the motor.
• You can switch on the motor again
after the cooling-off period has
expired or after deleting the thermal
motor model.
Asymmetry A limit for asymmetry has been exceeded.
Asymmetry can cause an overload. Possible
causes:
• Phase failure
• Fault in the motor windings
Check the motor feeder and the motor.