User Manual

Functions
5.7 Diagnostics and fault signals
SIRIUS 3RW30 / 3RW40
52 Manual, 10/2010, 535199502000 DS 03
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 113)).
For the maximum permissible settings,
refer to chapter "Technical dat
a
(Page 127)".
Check the rated operational current set
for the motor, select a lower CLASS
setting, or calculate the soft st
arter 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 127)), comply with
the minimum clearances.
Cause 1: Phase L1 / L2 / L3 is missing or
fails / collapses when the motor is
operating.
Tripped as a result of a dip in the
permissible rated operational voltage >
15 % for > 100 ms during the startup
process or > 200 ms in bypass mode.
Connect L1 / L2 / L3 or correct the
voltage dip.
Missing load voltage, phase failure
/ missing load:
Cause 2: The motor that is connected is
too small and the fault occurs as soon as
it is switched to bypass mode.
Set the correct rated operational current
for the connected motor or set it to the
minimum value (if the motor current is
less than 10 % of the set I
e
, the motor
cannot be operated with this starter).