3Rw30: Troubleshooting - Siemens SIRIUS 3RW30 Manual

Messages and diagnosis

6.2 3RW30: Troubleshooting

6.2 3RW30: Troubleshooting
Fault
Impermissible electronics
supply voltage
Bypass overload
Missing load voltage, phase
failure / missing load
Device error
58
Cause
The control supply voltage does not corre-
spond to the soft starter's rated voltage.
A current > 3.5 x I of the soft starter oc-
e
curs for > 60 ms in bypass mode (e.g.
because the motor is blocked).
Cause 1: Phase L1 / L2 / L3 is missing at
the start of soft starting or fails / collapses
when the motor is operating.
A trip occurs if a phase failure is detected
by the 3RW30 at the start of soft starting:
at the beginning of starting: tripping
•
time t > 0.5 s
in run-up or in bypass mode: phase
•
failure not detected
Cause 2: a motor that is not powerful
enough is connected.
A trip occurs if the current flowing through
the 3RW30 soft starter at the start of soft
starting is less than 10% of the rated op-
erational current of the 3RW30, or less
than 1 A.
Cause 3: Motor phase T1 / T2 / T3 is not
connected.
Soft starter defective.
Remedy
Check the control supply voltage; an incorrect
control supply voltage could be caused by a
power failure or a voltage dip.
Check the motor and load, and check the soft
starter's dimensions.
Connect L1 / L2 / L3 or correct the voltage
dip.
Note:
As soon as the motor is in run-up or bypass
mode, these faults are no loner detected. The
soft starter does not go to a fault state in
these cases, and contact 13-14 remains
closed.
If the phase failure occurs in the uncontrolled
phase, the response varies depending on
whether the control voltage has a reference or
connection to the AC network, or whether it is
isolated:
If the control voltage is isolated, the phase
•
failure of the uncontrolled phase will also
be detected when the motor is switched
off. With an On command, the 3RW30
goes immediately to a fault state, and con-
tact 13 / 14 does not close.
If the control voltage has a reference to
•
the AC network, the phase failure of the
uncontrolled phase is not detected, and
with an On command, the soft starter at-
tempts to start the motor. This can cause
the motor to hum.
Connect a motor with a higher rated opera-
tional current, or select a different soft starter.
Note:
As soon as the motor is in run-up or bypass
mode, these faults are no loner detected. The
soft starter does not go to a fault state in
these cases, and contact 13-14 remains
closed.
Connect the motor properly (e.g. jumpers in
the motor terminal box, repair switch closed
etc.)
Contact your SIEMENS partner or Technical
Assistance (Page 15).
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005