3UG4.1 line monitoring relay
6.7 3UG4617 / 3UG4618 line monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
159
Incorrect direction of rotation
With the CO contact 21-22-24 of the output relay K2, for example, an incorrectly fed phase
sequence for a load connected downstream can be automatically corrected using an
external reversing combination. The Chapter "Circuit diagrams (Page 165)" provides an
example of wiring for automatic phase correction.
Note
The 3UG4617 and 3UG4618 line monitoring relays only evaluate the phase sequence while
all 3 phases are present. For safety reasons, the phase sequence is not reevaluated after 2-
phase operation or a phase failure after which the third phase has appeared. In this case,
the output relay for the phase rotation remains in its last switching state. The phase
sequence is not reevaluated until after the device has been reset or all 3 phases have been
simultaneously switched off and on again.
Note
The 3UG4617 and 3UG4618 line monitoring relays are only suitable for line frequencies of
50 / 60 Hz!
You will find the switching states of the output relays below in the Section "Function
diagrams" and in the Chapter "Diagnostics (Page 162)."