Siemens SIRIUS 3RW44 User Manual page 120

Diagnosis and Messages
Message
Loss of phase L3
Missing load phase T1
Missing load phase T2
Missing load phase T3
Supply voltage below 75 %
Supply voltage below 85 %
Supply voltage above 110 %
Current unbalance exceeded
Thermal motor model overload
Prewarning limit motor heat build-up
Remaining time for tripping undershot
Line overvoltage (for product version <
*E04* devices)
Line voltage too high (for product
version *E04* devices)
7-4
Cause / Remedy
x Option 1: Phase L3 missing, drops or fails while motor is running.
A trip occurs due to a voltage drop in the permissible rated operational voltage of >15 %
>100 ms during starting, or >200 ms in bypass operation.
Remedy: Connect L3 or rectify voltage drop.
Option 2: The motor that is connected is too small and the error message is issued
immediately after switching to bridging mode.
Remedy: Set rated operating current for connected motor correctly or set to minimum (if
motor current is lower than 10 % of the configured I
this starter).
Option 3: Starter used in IT system with ground fault monitoring:
3RW44, product version  *E06* and the PROFIBUS DP communication module must not
be used in this network configuration.
Remedy: Replace starter with 3RW44, product version  *E07*. This version can be used
in combination with the PROFIBUS DP communication module. However, the phase
voltage values (UL-N) and phase-to-phase voltage values (UL-L) may be displayed
incorrectly on the measured value display of the 3RW44.
x Motor phase T1 is not connected.
Remedy: Connect motor correctly.
x Motor phase T2 is not connected.
Remedy: Connect motor correctly.
x Motor phase T3 is not connected.
Remedy: Connect motor correctly.
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 s
(voltage failure, voltage drop).
Remedy: Check control supply voltage.
x Control supply voltage is above 110 % of the required nominal voltage for longer than 2 s
(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 set 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, restarting is blocked until the
pre-charge time has elapsed.
Remedy in the case of unwanted tripping:
- Check whether the motor rated operating current I
- Change CLASS setting or
- Reduce switching frequency, or
- Deactivate motor protection (CLASS OFF)
x Motor heat build-up is greater than the parameter value for: Prewarning limit motor heat
build-up. The thermal motor model approaches an overload trip, depending on the set
value. For heavy starting and set values of tripping class CLASS 20, we recommend
increasing the "Prewarning Limit Motor Heat Build-Up" parameter value to 95 %.
x Time until overload tripping of the thermal motor model is shorter than the set value for the
"Prewarning limit remaining time for tripping" parameter.
For heavy starting and set values of tripping class  CLASS 20, we recommend increasing
the "Prewarning limit tripping reserve" parameter value to 0 s (deactivated).
x Applied 3-phase line voltage is not suitable for the device or longer voltage peaks occur.
Tripping occurs due to the permitted rated voltage being exceeded by >10 % >500 ms.
From product version *E02* upwards, the internal tripping limit has been increased to
>18 % >2000 ms.
Remedy: Apply correct voltage.
, the motor cannot be operated with
e
is incorrectly set or
e
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06