Siemens SIRIUS 3RW40, Manual

Page: 119 / 212

Commissioning
12.11 3RW40: LEDs and troubleshooting
SIRIUS 3RW30 / 3RW40
Manual, 01/2010, 535 1995-02 DS01
119
Fault Cause Remedy
Impermissible electronics supply
voltage: The control supply voltage does not
correspond to the soft starter's rated
voltage. 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.
Impermissible Ie/CLASS setting
and IN (0->1)
(control voltage present, IN start
command changes from 0 to 1)
The rated operational current I
e
set for
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]".
Check the rated operational current set
for the motor, select a lower CLASS
setting, or calculate the soft starter with a
size allowance.
Motor protection tripping Overload
relay / thermistor: 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. - Check whether the motor's rated
operational current I
e
is set correctly, or
- Change the CLASS setting, or
- Possibly reduce the switching frequency,
or
- Deactivate the motor protection (CLASS
OFF), or
- Check the motor and the application.
Thermistor protection: wire
breakage / short-circuit (optional for
3RW40 2. to 3RW40 4. devices): Temperature sensor at terminals T11/
T12/T22 is short-circuited or defective, a
cable is not connected, or no sensor is
connected. Check the temperature sensor and the
wiring
Thermal overload on the device: 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.
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.