ABB REF542plus Operator's Manual page 61

1MRS755869
Multifunction Protection and Switchgear Control
Unit
Operator's manual
Fig. 15.3.-2 REF542plus has voltage at both inputs indicating the primary object
position
Solution:
Check the wiring of the primary object. Verify that REF542plus connectors
are properly inserted and tightened.
Note: When the primary object in such an undefined positions, issuing an
open command will activate the open coil on the circuit breaker. The open
operation is never blocked. The close operation with the object in the
undefined position is blocked. A close command will be discarded and will
turn the interlocking error LED on.
REF542plus
A051445
61