Siemens 3RW44 - Warnings and Group Faults

Diagnostics and messages
8.1 Diagnostics and messages
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
141
8.1.2
Warnings and group faults
① Warning
② Fault without restart
③ Fault with restart
Message
①
②
③
Cause/solution
No supply voltage x
1. Start command has been issued although the main voltage is not
yet applied.
Remedy:
Switch on the supply voltage.
2. If the message occurs in the bypass mode, it may have been
generated erroneously by a too frequently generated "Prewarning
limit - motor heating", "Remaining time for tripping" or "I
e
limit
exceeded/undershot" warning (can also be traced via the entries in
the logbook/events).
Remedy:
See description of applicable messages
3. Main voltage is removed simultaneously with the ON command,
although run down (not "Coasting down") is parameterized.
Remedy:
Activate line contactor by means of output parameterized
to ON time or parameterize "Coasting down".
Incorrect starting conditions
(for devices with product version
< *E04*)
Phase angle control faults
(for devices with product version
≥ *E04*)
x
1. Fault occurs without motor starting.
Cause:
– Motor has not been connected correctly.
– Inside-delta circuit is wrongly configured.
– There is a ground fault.
Remedy:
Check and correct wiring (see circuit suggestions for
inside-delta circuit).
2. Fault occurs during starting.
Cause:
– Chosen starting voltage too high
– Breakaway pulse (wrongly) set: Motor starting becomes
unstable
(set the breakaway pulse only when it is really required. In the case
of pumps, for example, a breakaway pulse often leads to misfiring.)
If there is an idle time < 5 s since the last start, the 3RW44 starts
with a higher starting voltage. In combination with a set breakaway
pulse, this can lead to "incorrect starting conditions".
Remedy: Adjust parameters or extend idle time.