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Installation and uninstallation
Preliminary work
Connecting
4.3.1
Connecting the phase connection lines
D000062026 en a – E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
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.
Grounding
When using voltage transformers, the secondary star-point (or centre point
in Aron circuit) of the transformer is grounded. 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.
Figure 54. Test terminal block status before installing the meter (terminal layout
according to DIN)
The electrical connections to the meter should be made as follows
according to the connection diagram:
1.
Check whether the preliminary work described above has been
performed. If not, complete this work (test terminal blocks should only
be touched with an insulated screwdriver).
2.
Check with a phase tester or universal measuring instrument whether
the connecting wires are live. If so, remove the corresponding supply
fuses and keep them in a safe place until installation is completed, so
that they cannot be replaced by anyone unnoticed.
1.
Shorten the phase connecting wires to the required length and then
strip them.
2.
Insert the phase connecting wires in the relevant terminals (the
terminals are numbered as shown in the connection diagram) and
tighten the terminal screws firmly (torque 1.7 Nm).
It is recommended to identify the beginning and end of the relevant
conductors with a suitable test unit (e.g. buzzer) to ensure that the
right consumer is connected to the meter output.
53/96
© Landis+Gyr
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