Siemens SIRIUS 3RW55 - Page 251

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