Siemens SIRIUS 3RW30 Manual page 48

Functions
5.7 Diagnostics and fault signals
Fault
Impermissible electronics supply
voltage:
Impermissible Ie/CLASS setting
and IN (0->1)
(control voltage present, IN start
command changes from 0 to 1)
Motor protection tripping Overload
relay / thermistor:
Thermistor protection: wire
breakage / short-circuit (optional for
3RW40 2. to 3RW40 4. devices):
Thermal overload on the device:
48
Cause
The control supply voltage does not
correspond to the soft starter's rated
voltage.
The rated operational current I
the motor (control voltage present, start
command present) exceeds the
associated, maximum permissible setting
current referred to the selected CLASS
setting (chapter Motor current settings
[Page 107]).
For the maximum permissible settings,
refer to chapter "Technical data [Page
121]".
The thermal motor model has tripped.
After an overload trip, restarting is
inhibited until the recovery time has
elapsed.
- Overload relay tripping time: 60 s
- Thermistor tripping time: When the
temperature sensor (thermistor) in the
motor has cooled down.
Temperature sensor at terminals T11/
T12/T22 is short-circuited or defective, a
cable is not connected, or no sensor is
connected.
Overload trip of the thermal model for the
power unit of the 3RW40
Possible causes
• Too many starts,
• Motor ramp-up time too long,
• Ambient temperature in switching
device's environment too high,
• Minimum installation clearances not
complied with.
Remedy
Check the control supply voltage; could
be caused by a power failure, voltage dip,
or incorrect control supply voltage. Use a
stabilized power supply unit if due to
mains fluctuations.
set for Check the rated operational current set
e
for the motor, select a lower CLASS
setting, or calculate the soft starter with a
size allowance.
- Check whether the motor's rated
operational current I
- Change the CLASS setting, or
- Possibly reduce the switching frequency,
or
- Deactivate the motor protection (CLASS
OFF), or
- Check the motor and the application.
Check the temperature sensor and the
wiring
Wait until the device has cooled down
again, possibly increase the current
limiting value set for starting, or reduce
the switching frequency (too many
consecutive starts). Possibly retrofit the
optional fan (3RW40 2. to 3RW40 4.).
Check the load and the motor, check
whether the ambient temperature in the
soft starter's environment is too high
(derating above 40 °C, refer to chapter
Technical data [Page 121]), comply with
the minimum clearances.
Manual, 01/2010, 535 1995-02 DS01
is set correctly, or
e
SIRIUS 3RW30 / 3RW40