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Maintenance
© Gyr
D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
7.1.5 No-Load
Test
A test voltage U
p
of 1.15 U
n
is used for the no-load test (creep test)
according to IEC 62053-21 (e.g. U
p
= 265 V with U
n
= 230 V).
Procedure:
1. Disconnect the meter from the mains for at least 10 seconds.
2. Switch on the test voltage U
p
and wait approx. 10 seconds. Both the
active (circle) and the reactive (diamond) no-load indication must now
be permanently on. The energy direction indicators are off.
L
1
L
2
L
3
k
h
7.1.6 Starting
Test
Procedure:
1. Apply a load current of 0.1% of the base current I
b
or, for MID meters,
of the reference current I
ref
, e.g. 10 mA with I
b
=I
ref
=10 A, and the
voltage U
n
(three-phase in each case). The meter must remain in no-
load.
L
1
L
2
L
3
k
h
2. Increase the load current to 0.5% I
b
(for MID: to 0.5% I
ref
) (i.e. 50 mA
with I
b
= I
ref
= 10 A). The energy direction arrow must appear within 10
seconds and both no-load indications must disappear. The optical test
output for active energy must start to flash.
L
1
L
2
L
3
k
h
+P
7.2 Cleaning
Danger of short-circuits
Never clean soiled meters under running water or with high pressure
devices. Water penetration can cause short-circuits. To remove normal dirt
like dust a damp cloth is sufficient. If the meter is heavily soiled, it should be
dismantled, if necessary, and sent to an authorised service centre, so that a
new plastic viewing window can be fitted.
