Siemens SIRIUS 3RW44 System Manual page 120

Diagnosis and Messages
Message
Supply voltage below 75 %
Supply voltage below 85 %
Supply voltage above 110 %
Current unbalance exceeded
Therm. motor model overload
Prewarning motor temp.
Prewarning time undershot
System overvoltage (for product version
< *E04* devices)
System voltage too high (for product
version ≥ *E04* devices)
Current range overflow
Motor stalled - switched off
(for product version < *E07* devices
only)
Overcurrent
Power unit overheated
7-4
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 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 failure, voltage drop, 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 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 set value for the: Prewarning motor temp. The
thermal motor model approaches an overload trip, dependent upon the set value. For
heavy starting and set values of the tripping class ≥ CLASS 20, we recommend increasing
the "Prewarning motor temp." parameter value to 95 %.
x Time until overload tripping of the thermal motor model is shorter than the specified value
for the "Prewarning limit tripping reserve" parameter.
For heavy starting and set values of the tripping class ≥ CLASS 20, we recommend
increasing the "Prewarning limit tripping reserve" parameter value to 0 s (deactivated).
x Applied control supply voltage is not suitable for the device or longer voltage peaks occur.
Tripping occurs due to the permitted rated control supply voltage being exceeded by
>10 % >500 ms.
Remedy: Apply correct voltage.
x 1. 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 starting, breakaway
pulse or combined braking.
Remedy: If the "Voltage ramp" starting mode is selected, extend the set ramp time or
lower the breakaway voltage or braking torque. The soft starter may be too small for the
motor.
2. If this message is issued during start-up, it may have been mistakenly issued because one
of the following messages was generated too often: "Prewarning motor temp.",
"Prewarning time" or "Current limit exceeded/undershot" (can also be traced via the entries
in Log list / Events).
Remedy: See the description of the respective messages.
x A very high current suddenly occurs in bridging mode, e.g. when the motor stalls (I >
4 x I higher than 100 ms).
sMotor
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 unit.
Remedy: Wait until the device has cooled down, perhaps set a lower current limit or
reduce the switching frequency (too many starts in succession).
Check whether the motor is blocked or the ambient temperature is too high in the vicinity of
the soft starter (for derating above 40 °C, refer to Chapter 10.3 "Technical Data").
is incorrectly adjusted or
e
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04