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Installation and De-Installation
4.3
Connecting Meter
Preliminary work
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
7.
Drill the three holes for the fixing screws.
8.
Unscrew the meter terminal cover.
9.
Fit the meter with the three fixing screws on the mounting surface pro-
vided.
Dangerous voltage on conductors
The connecting conductors at the point of installation must be voltage-free
for installation of the meter. Contact with live components is dangerous to
life. The relevant supply fuses should therefore be removed and kept in a
safe place until finishing work, so that they cannot be re-inserted by other
persons unnoticed.
The jumpers in the voltage connections must also be opened at the test
terminal block (e.g. TVS14). For this purpose release the screw of the rele-
vant jumper with an insulated screwdriver, move the jumper away from the
terminal on the meter side and then re-tighten the screw.
If no test terminal block is available, the primary voltage must be inter-
rupted, i.e. the system switched off.
Dangerous voltage on current transformers
The current transformer secondary circuits must not be opened when cur-
rent is flowing in the primary. This would produce a dangerous voltage at
the terminals of several thousand volts and the insulation of the transformer
would be destroyed.
To install the meter, short-circuit the secondary of the current transformer to
the test terminal block (e.g. TVS14). For this purpose release the screw of
the relevant short-circuiting jumper with an insulated screwdriver, move the
jumper away over the terminals on the meter side and then re-tighten the
screw. The circuit on the meter side can then be opened without danger.
If no test terminal block is available, the primary voltage must be inter-
rupted, i.e. the system switched off.
It is assumed that the transformers and test terminal blocks have already
been correctly fitted, the current transformers are short-circuited and the
voltage connections opened.
Earthing
When using voltage transformers, the secondary star-point (or centre point
in Aron circuit) of the transformer is earthed. The secondary circuits of the
current transformers are also earthed one side (connection k).
Preliminary supply fuses must be used with direct voltage connection. The
current transformers must not be earthed on the secondary side in this
case, see connection diagram.
49/93
© Landis+Gyr AG
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