User Manual

Functions
5.7 Diagnostics and fault signals
SIRIUS 3RW30 / 3RW40
Manual, 10/2010, 535199502000 DS 03
49
For notes on troubleshooting, refer to the table below.
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; an
incorrect control supply voltage could be
caused by a power failure or a voltage
dip.
Bypass overload A current > 3.5 x I
e
of the soft starter
occurs for > 60 ms in bypass mode (e.g.
because the motor is blocked).
Check the motor and load, and check the
soft starter's dimensions.
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.
Cause 2: The motor that is connected is
too small and the fault occurs as soon as
it is switched to bypass mode.
If less than 10 % of the soft starter's rated
current is flowing, the motor cannot be
operated with soft starter. Use another
soft starter.
Missing load voltage, phase failure
/ missing load
Cause 3: Motor phase T1 / T2 / T3 is not
connected.
Connect the motor properly (e.g. jumpers
in the motor terminal box, repair switch
closed etc.)
Device fault Soft starter defective. Contact your SIEMENS partner or
Technical Assistance.