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4.7
De-Installation
© Landis+Gyr AG
Dangerous voltage on conductors
The connecting conductors must be free from voltage when the meter is
removed. It is dangerous to life to touch live parts. Remove the corre-
sponding supply fuses and ensure that they cannot be re-inserted by any-
one unnoticed before completing the work.
If the meter is connected via voltage transformers, it must be possible to
open the test terminal (e.g. TVS14). For this purpose release the screw of
the relevant jumper with an insulated screwdriver, push the jumper away
from the terminal and then re-tighten the screw.
If there is no test terminal block, the primary voltage must be interrupted,
i.e. the system switched off.
Dangerous voltage on current transformers
The secondary sides of the current transformer circuits must not be opened
if a current is flowing in the primary. This would produce an extremely high
voltage of several thousand volts dangerous to life at the terminals and the
insulation would be destroyed.
Short-circuit the current transformer at the test terminal block (e.g. TVS14)
to remove the meter. For this purpose release the screw of the relevant
short-circuit jumper with an insulated screwdriver, push the short-circuit
jumper over the terminals on the current transformer side and then retigh-
ten the screw. The circuit on the meter side can then be opened without
danger.
If there is no test terminal block, the primary voltage must be interrupted,
i.e. the system switched off.
The meter should be removed as follows:
1. Short-circuit the current transformer with the short-circuit jumpers in the
test terminal block using an insulated screwdriver and interrupt the volt-
age connections with the jumpers in the test terminal block.
2. Remove the two utility seals at the screws of the terminal cover.
3. Release the two screws of the terminal cover and remove it.
4. Check that the connecting wires are not live using a phase tester or uni-
versal measuring instrument. If not, check the condition of the test ter-
minals again according to Fig. 4.18. Remove the relevant supply fuses
if necessary and ensure that they cannot be re-inserted by anyone un-
noticed before completing the installation.
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Installation and De-Installation
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