Maintenance
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D000062026 en a
– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
© Gyr
7.1.4
No-load test
A test voltage U
p
of 1.15 U
n
is used for the no-load test (creep test) to IEC
62053-21 (e.g. U
p
= 265 V with U
n
= 230 V).
Procedure:
1.
Disconnect the meter from the network for at least 10 seconds.
2.
Then switch on the test voltage U
p
and wait approx. 10 seconds. After
this time the energy direction arrows must disappear. The red optical
test outputs are permanently "lit".
3.
Switch on test mode (high resolution).
The meter must not deliver more than one pulse during the no-load
test. Check the energy levels for changes in test mode. They must not
increase by more than the value of one pulse (see faceplate).
7.1.5
Starting test active part
Procedure:
1.
Apply a load current of 0.02% of the nominal current In (IEC meters) or
0.02% of the reference current I
ref
(MID meters)
– e.g. 1 mA with I
n
=
I
ref
= 5 A
– and the voltage U
n
(three-phase in each case) and
cosφ =
1.
The meter must remain in no-load.
2.
For ZxD410:
Increase the load current to 0.2% I
n
(IEC meters) or 0.2%
I
ref
(MID meters)
– e.g. 10 mA with I
n
=I
ref
= 5 A.
For ZxD405, ZxD402:
Increase load current to 0.1% I
n
(=0.1 I
ref
). The
energy direction arrow "P" must appear within 10 seconds. The optical
test output for active energy consumption is no longer permanently "lit".
7.1.6
Starting test reactive part
Procedure:
1.
Apply a load current of 0.02% of the nominal current I
n
(e.g. 1 mA with
I
n
= 5 A) and the voltage U
n
(three-phase in each case) and
sinφ = 1
.
The meter must remain in no-load.
2.
Increase the load current to 0.2% I
n
(i.e. 10 mA with I
n
= 5 A).
The energy direction arrow "Q" must appear within 10 seconds. The
optical test output for reactive energy consumption is no longer
permanently "lit".
