Siemens Sirius 3RW44 System Manual page 97

Message
Supply voltage under 75%
Supply voltage under 85%
Supply voltage over 110%
Current asymmetry exceeded
Thermal motor model overload
Prewarning limit motor heat build-up
Remaining time for tripping undershot
Line overvoltage
Current measuring range exceeded
Switch off - motor stalls
Current range exceeded
Power component overheated
Power component overtemperature
Temperature sensor short circuit
Temperature sensor wire break
Temperature sensor overload
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 01
Cause / Remedy
x Control supply voltage is below 75 % of the required nominal voltage for longer than
100 ms (voltage failure, voltage drop, wrong control supply voltage).
Remedy: check control supply voltage.
x Control supply voltage is below 85 % of the required nominal voltage for longer than 2 ms
(voltage failure, voltage drop).
Remedy: check control supply voltage.
x Control supply voltage is below 110 % of the required nominal voltage for longer than
100 ms (voltage peaks, wrong control supply voltage).
Remedy: check control supply voltage.
x x Phase currents are asymmetric (asymmetric load). Message is output when the
asymmetry is greater than the configured limit (parameter: current asymmetry limit value).
Remedy: check load or change parameter value.
x x x The thermal motor model has tripped. After an overload trip, there will be no restart until
the pre-charge time has elapsed.
Remedy for unwanted tripping:
- check whether the motor rated operating current Ie is not adjusted properly or
- change CLASS setting or
- reduce switching frequency or
- deactivate motor protection (CLASS OFF)
x Motor heat build-up is greater than the specified value for the "prewarning limit motor
heat build-up" parameter. The thermal motor model approaches an overload trip according
to the selected value.
x Time for overload tripping of the thermal motor model is shorter than the specified value
for the "prewarning limit remaining time for tripping" parameter.
x Applied main voltage is not suitable for the device or longer voltage peaks occur.
Remedy: apply correct voltage.
x A very high current has occurred (beyond the measuring range of the current transformers
integrated in the soft starter). This may happen in the case of: direct on-line starting,
breakaway pulse or combined braking.
Remedy: If voltage ramp starting mode is selected, extend the set ramp time or lower the
breakaway voltage or the braking torque. The soft starter dimension is possibly too small
for the motor.
x A very high current suddenly occurs in bridging mode, e.g. when the motor stalls.
Remedy: check motor.
x A current of more than 6 times the rated operating current has occurred for a long period
of time.
Remedy: activate current limiting or check dimensioning (device/motor).
x x Overload trip of the thermal model for the power component.
Remedy: wait until the device has cooled down, try to set a lower current limit or reduce
the switching frequency (too many starts in succession).
x Temperature of the thermal model for the power component is higher than the permissible
permanent operating temperature.
x x x Temperature sensor is short at terminals T1/T2.
Remedy: check temperature sensor.
x x x Temperature sensor at terminals T1/T2 is defective or a cable is not connected or no
sensor is connected at all.
Remedy: check temperature sensor, or if none is connected: deactivate temperature
sensor.
x x x Temperature sensor at terminals T1/T2 has tripped, the motor is overheated.
Remedy: wait until the motor has cooled down.
Diagnostics and messages
7-3