Siemens SENTRON Manual page 178

Service and maintenance
10.1 Fault rectification
Fault state
The warning LED on the motor operator lights up.
The transfer switching equipment cannot be locked.
178
Procedure for fault rectification
In the case of the 3KC4 transfer switching equipment,
•
the warning LED on the motor operator lights up when
the transfer switching equipment is in manual operation.
If the LED lights up even though the transfer switching
equipment is in automatic mode, an internal fault is ac-
tive. To reset the state, switch the transfer switching
equipment from automatic mode to manual operation
and back again to automatic mode. Alternatively, the
transfer switching equipment can be reset on the hard-
ware by switching off the power supply to the transfer
switching equipment for more than 3 minutes. If the LED
continues to light up, you must locate and correct the
fault.
The warning LED lights up if contacts 313 (priority com-
•
mand for the OFF position) and 317 are closed. This is a
normal state.
If the LED lights up for other reasons, contact Technical
•
Support (http://www.siemens.com/lowvoltage/technical-
support).
Check whether the transfer switching equipment is in the
•
"Manual" position.
Ensure the handle for manual transfer has been re-
•
moved and is not secured in the assembly.
Check whether the switch on the transfer switching
•
equipment is in the O position (padlocking mode is only
possible in the O position).
Manual, 08/2017, L1V30368969104A-02