Datasheet

ESG 5.16

Function description

Dimensions

Phase sequence monitoring

When all the phases are connected in the correct sequence and the

measured asymmetry is less than the fixed value, the output relays

switch into on-position (yellow LED illuminated). When the phase

sequence changes, the output relays switch into off-position (yellow

LED not illuminated).

Phase failure monitoring

When one of the three phases fails, the output relays switch into

off-position (yellow LED not illuminated).

Detection of reverse voltage (by means of evaluation of asym-

metry)

The output relays switch into off-position (yellow LED not illumina-

ted) when the asymmetry between the phase voltages exceeds the

fixed value of the asymmetry.

An asymmetry caused by the reverse voltage of a consumer (e.g. a

motor which continues to run on two phases only) does not effect

the disconnection.

Connection

3-phase voltage monitoring relay

EMR DU31D

LED U

L2 L3 L2 L1 L3

LED U

L2 L3

LED U

L2 L3

Asym.

4713 20

9 10 11 1 2 3

8 7 6 5 4

L2 L1N

Measuring range 3 (N) 400/230 Vac

Supply voltage = measuring range