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NOVATEK-ELECTRO
UBZ-304
Appendix
В
UBZ OPERATION FOR MOTOR CONTROL WITH WINDING CHANGEOVER WHEN STAR-TO-DELTA STARTING
(mandatory)
For operation of UBZ-304 for motor with windings changeover when star-to-delta starting to connect the unit
according to figure B.1.
К1 –
Starter of motor enabling
К2
-
Star starter of motor winding enabling;
К3 –
Delta starter of motor winding enabling;
Q1
–
automatic breaker.
Figure B.1
–
Diagram for UBZ enabling for the motor operation with star-delta switching over and
the motor insulation control
When UBZ is in the star-delta mode it is allowed performing the motor control in the following ways:
–
the motor disabling/enabling using the external automatic starter (actuator) at the same time with the de-
energizing/energizing the UBZ unit;
–
motor control on the front panel of UBZ;
–
motor control via RS-232/RS-485 interface.
IT IS STRICTLY FORBIDDEN TO SHUTDOWN THE MOTOR BY EXTERNAL MACHINE (THE STARTER)
WITHOUT UBZ DE-ENERGIZING.
As an exception, it is allowed after the motor is switched off by external machine (the starter), additionally to turn
off the motor on UBZ front panel or via RS-232/RS-485 interface to avoid the direct delta starting