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Installation and uninstallation
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D000062026 en a
– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
© Gyr
4.5
Commissioning, functional check and sealing
Dangerous voltage on conductors
The supply fuses must be re-inserted or the jumpers of the voltage circuits
in the test terminal block re-closed before commissioning and functional
check of the meter.
If the terminal cover is not screwed tight, there is a danger of contact with
the connection terminals. Contact with live components is dangerous to life.
The relevant supply fuses should therefore be removed before making any
modifications to the installation and these kept in a safe place until
completing the work to prevent anyone re-inserting them unnoticed. The
jumpers in the test terminal block of the voltage circuits should again be
opened and secured.
Dangerous voltage on current transformers
The current transformer circuits must be closed before commissioning and
functional check of the meter. Opening the jumpers short-circuiting the
secondary sides of the transformers permit the transformer current to flow
through the meter. Opening of the short-circuit jumper must never interrupt
the circuit.
Prerequisites for commissioning and functional check
The functional check requires voltage to be applied and load applied to all
phases. If export is possible, determine first the energy direction present.
If no network voltage is present, commissioning and functional check must
be performed at a later date.
Via the test terminal blocks you can also supply the meter from suitable
auxiliary sources on the secondary side with the system switched off.
Repeat the functional check later with the system switched on.
The installed meter should be put into service and checked as follows:
1.
Close the jumpers of the voltage paths in the test terminal block with
an insulated screwdriver and re-insert the supply fuses.
2.
Check on the display whether all three phases L1, L2 and L3 are
indicated and show the right phase sequence.
– If one phase is not present or less than 20 V, then the relevant
symbol is absent.
– With the normal phase sequence L1-L2-L3 the symbols are
displayed continuously.
– If, however, the meter is connected with reversed phase sequence
(e.g. L2-L1-L3) the symbols flash. The direction of field rotation
(clockwise or anticlockwise) is determined by the parameterisation.
This has no influence, however, on the measuring behaviour of the
meter.
Figure 59. Phase sequence indication