Siemens SIRIUS 3RW55 Equipment Manual page 251

Warning
Preset unequal actual configuration
Switching element too hot for Start
New EX parameter values detected
Remaining time for tripping warning lim‐
it undershot
Motor heating warning limit exceeded
Current limit - maintenance demanded
exceeded
Current limit - maintenance demanded
undershot
Asymmetry limit warning exceeded
Ground fault limit warning exceeded
Switching frequency time not kept
2-phase control with defective thyristor
active
1)
Main power rotation faulty
Check fan
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
9.3 Warnings and remedial measures of the 3RW55 and 3RW55 Failsafe soft starters
Cause
Real and configured slot of module is dif‐
ferent.
Contact block (switch contact, power
semiconductors) too hot.
Parameters for the EX motor protection
have been received.
The time to overload trip of the thermal
motor model is shorter than the config‐
ured time for the tripping reserve.
• The motor feeder is overloaded.
• The motor temperature has excee‐
ded a limit.
The current has exceeded a limit.
The current has undershot a limit.
A limit for asymmetry has been excee‐
ded. Asymmetry can cause an overload.
Possible causes:
• Phase failure
• Fault in the motor windings
The ground-fault monitoring has respon‐
ded. An impermissibly high residual cur‐
rent is flowing.
The maximum number of starting oper‐
ations in the monitoring period has been
exceeded.
For 3-phase operation, only 2 phases are
activated because a power semiconduc‐
tor is defective.
The direction of rotation field is not cor‐
rect.
• Internal fan is dirty (not rotating free‐
ly).
• Connecting cable has fallen off or is
defective.
• Internal fan faulty
Messages and diagnostics
Remedy
Ensure consistency between plugged
and configured module position. Possi‐
bly the referenced module has a wiring
error.
• Check the ambient conditions asso‐
ciated with cooling. You may want to
consider lowering the operating
characteristics.
• Check the number of switching op‐
erations.
Confirm the correctness of the parame‐
ters directly on the protection device, or
for the protection device.
• Let the motor cool down.
• For heavy starting and settings for
tripping CLASS 20, deactivate this
monitoring.
• Check the motor and the applica‐
tions driven by the motor.
• You can switch on the motor again
after the cooling-down period has
expired or after deleting the thermal
motor model.
Check the application driven by the mo‐
tor.
Check the motor feeder and the motor.
Check the connecting cable of the motor
for damage.
The next starting operation should take
place only after the interlock time has
expired.
Check the power semiconductors for L1,
L2 and L3 and replace any that are de‐
fective.
-
• Check the function of the fan.
• Clean the fan.
• Check the wiring.
• Replace the fan.
251