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Maintenance
7.1.4
No-load test
7.1.5
Starting test active part
7.1.6
Starting test reactive part
D000062026 en a – E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
A test voltage U
of 1.15 U
p
62053-21 (e.g. U
= 265 V with U
p
Procedure:
1.
Disconnect the meter from the network for at least 10 seconds.
2.
Then switch on the test voltage U
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).
Procedure:
1.
Apply a load current of 0.02% of the nominal current In (IEC meters) or
0.02% of the reference current I
= 5 A – and the voltage U
I
ref
1. The meter must remain in no-load.
2.
For ZxD410: Increase the load current to 0.2% I
(MID meters) – e.g. 10 mA with I
I
ref
For ZxD405, ZxD402: Increase load current to 0.1% I
energy direction arrow "P" must appear within 10 seconds. The optical
test output for active energy consumption is no longer permanently "lit".
Procedure:
1.
Apply a load current of 0.02% of the nominal current I
I
= 5 A) and the voltage U
n
The meter must remain in no-load.
2.
Increase the load current to 0.2% I
The energy direction arrow "Q" must appear within 10 seconds. The
optical test output for reactive energy consumption is no longer
permanently "lit".
is used for the no-load test (creep test) to IEC
n
= 230 V).
n
and wait approx. 10 seconds. After
p
(MID meters) – e.g. 1 mA with I
ref
(three-phase in each case) and cosφ =
n
=I
= 5 A.
n
ref
(three-phase in each case) and sinφ = 1.
n
(i.e. 10 mA with I
n
87/96
=
n
(IEC meters) or 0.2%
n
(=0.1 I
). The
n
ref
(e.g. 1 mA with
n
= 5 A).
n
© Landis+Gyr
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