Siemens 3RW44 - Page 143

Diagnostics and messages
8.1 Diagnostics and messages
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
143
Message
①
②
③
Cause/solution
Phase failure L3 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
e
, the motor cannot be operated with this starter).
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.
Missing load phase T1 x Motor phase T1 is not connected.
Remedy: Connect the motor properly.
Missing load phase T2 x Motor phase T2 is not connected.
Remedy:
Connect the motor properly.
Missing load phase T3 x Motor phase T3 is not connected.
Remedy: Connect the motor properly.
Supply voltage below 75 % 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.
Supply voltage below 85% 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.
Supply voltage above 110% 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.
Current unbalance exceeded 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.
Thermal motor model overload 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
e
is set
correctly, or
• Change the CLASS setting, or
• Possibly reduce the switching frequency, or
• Deactivate the motor protection (CLASS OFF)