DOC. MIE91093 Rev. 1.34 Page 43 of 145
. Select the auxiliary voltage range and the fault mode as
follows.
AUX VAC/VDC > Aux VAC control > Range (RET)
Mode > Fault > ESC
The range should be the closest one to the voltage to be
generated. With this selection the auxiliary voltage is
continuously generated: we will test the relay modifying the
auxiliary voltage and the current according to the point to be
tested on the V-I curve.
. Set the timer with the following selections:
Timer start/stop > START > INT (RET)
STOP > EXT > Clean (Voltage) (RET)
Edge ESC
NOTE: stop clean or voltage according to the relay trip contact
connections.
. Next step serves to ascertain that the relay is correctly
connected; to this purpose we perform two tests in opposite
directions. The angle between auxiliary voltage and current is
set as follows.
AUX VAC/VDC > Aux VAC control > Phase > Adjust
phase Vaux-Imain > (adjust phase) ESC
NOTE: the adjustment can be performed only after having
adjusted the current output. If the current is too low, the
measurement can be difficult; in this case, it is possible to
adjust the voltage with reference to the mains, that, in turn, is
in phase with the current.
The two tests are:
I = IN; V = VN; = 180° + MTA. Press ON+TIME: the
relay should not trip.
I = IN; V = VN; = MTA. Press ON+TIME: the relay
should trip.
Only if the result of the direction test is correct we can proceed
with other tests.
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