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8.4
Faults and remedial actions of the 3RW51 soft starter
Error
Fault
No.
1)
303
Bus fault
308
Switching element
defective
309
Switching element
overload
317
Electronics supply
voltage too low
319
No supply voltage
327
Thermal motor model
overload
3RW51 Soft Starter
Manual, 06/2019, A5E37108631002A/RS-AB/002
8.4 Faults and remedial actions of the 3RW51 soft starter
Cause
Remedy
-
Acknowledgment via Auto
RESET
-
Check switching
•
elements L1, L2, and
L3.
Replace the defective
•
devices.
Switching element
Check the ambient
•
(switch contact,
conditions linked to
power
cooling. You might have
semiconductors)
to take derating into
too hot.
consideration.
Check the number of
•
switching operations.
Acknowledgment after
•
cooling down
The supply
Check the power supply
voltage is below
(load dimensioning, voltage
the permissible
range).
value.
Inspect the cables and the
The power
•
cable connections and
switch is open
replace any faulty
or the power
components.
supply is not
correctly
connected.
No current
•
The motor
Please check the motor
•
•
feeder is
and the applications
overloaded.
driven by the motor.
The motor
After tripping, you can
•
•
temperature
switch on the motor
rise has
again after the cooling
exceeded a
time has expired or
limit.
after clearing the
thermal memory of the
motor.
Messages & diagnostics
Manual
Remote
RESET
RESET
-
-
-
-
x
x
-
-
x
x
x
x
2)
2)
Auto
RESET
x
-
-
x
-
x
2)
123
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