Siemens 3RW44 Manual page 143

Message
Phase failure L3
Missing load phase T1
Missing load phase T2
Missing load phase T3
Supply voltage below 75 %
Supply voltage below 85%
Supply voltage above 110%
Current unbalance exceeded
Thermal motor model overload
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
① ② ③
Cause/solution
x Option 1: Phase L3 is missing or fails/collapses when the motor is in
operation.
Tripped as a result of a dip in the permissible rated operational voltage
> 15 % for > 100 ms during the startup process or > 200 ms in bypass
mode.
Remedy: Connect L3 or rectify the voltage dip.
Option 2: A motor that is not powerful enough is connected and the
fault occurs as soon as a switchover is made to bypass mode.
Remedy: Set the correct rated operational current for the connected
motor or set it to the minimum value (if the motor current is less than
10 % of the set I
Option 3: Starter used in IT system with ground-fault monitoring
3RW44, product version < *E06* and the PROFIBUS DP
communication module must not be used in this network configuration.
Remedy: Replace starter with 3RW44, product version ≥ *E07*. Here,
use in combination with the PROFIBUS DP communication module is
admissible. However, the phase voltage values (UL-N) and phase-to-
phase voltage values (UL-L) may be displayed incorrectly on the
measured value display of the 3RW44.
x Motor phase T1 is not connected.
Remedy: Connect the motor properly.
x Motor phase T2 is not connected.
Remedy: Connect the motor properly.
x Motor phase T3 is not connected.
Remedy: Connect the motor properly.
x Control supply voltage is less than 75% of the required rated voltage for
more than 100 ms (voltage failure, voltage dip, incorrect control supply
voltage).
Remedy: Check the control supply voltage.
x Control supply voltage is less than 85 % of the required rated voltage
for more than 2 s (voltage failure, voltage dip).
Remedy: Check the control supply voltage.
x Control supply voltage is more than 110 % of the required rated voltage
for more than 2 s (voltage peaks, incorrect control supply voltage).
Remedy: Check the control supply voltage.
x x The phase currents are asymmetrical (unbalanced load). Message is
output when the asymmetry is greater than the set limit (parameter:
Current asymmetry limit value).
Remedy: Check the load or modify the parameter value.
x x x The thermal motor model has tripped. After an overload trip, restarting
is inhibited until the recovery time has elapsed.
Remedy in the event of unwanted tripping:
Check whether the motor's rated operational current I
•
correctly, or
Change the CLASS setting, or
•
Possibly reduce the switching frequency, or
•
Deactivate the motor protection (CLASS OFF)
•
8.1 Diagnostics and messages
, the motor cannot be operated with this starter).
e
Diagnostics and messages
is set
e
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