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Installation and De-Installation
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Artificial star point
With the three-wire circuit the artificial star point (terminal 11) must not be
externally wired.
Connecting the signal inputs and outputs
Maximum current at auxiliary terminals
The circuits connected to the auxiliary terminals must be built in such a way
that the maximum current is never exceeded, as this might damage the meter.
Maximum current of the voltage outputs: 1 A.
Maximum current of the output contacts: 100 mA.
Use fuses or protective relays between external and internal circuits to
avoid defects and a possible exchange of the meter.
1. Shorten the connecting wires of the signal inputs and outputs to the re-
quired length and strip them for approx. 4 mm (wires and strands up to
2.5 mm² can be connected).
2. If stranded wire is used, it is recommended to provide it with ferrules for
connection.
3. Connect the connecting wires of the signal inputs and outputs as fol-
lows to the screwless spring-loaded terminals (the terminals are num-
bered as shown on the connection diagram):
– Insert a size 1 screwdriver in the upper opening and insert it turning
slightly upwards (Fig. 4.11 A).
– Now place the stripped connecting wire in the lower opening and
hold it there securely (Fig. 4.11 B).
– Withdraw the screwdriver. The connecting wire is then firmly fixed
(Fig. 4.11 C).
Fig. 4.11
Connection in screwless spring-loaded terminals
Bare end of connecting wire must not be too long
The insulation of the connecting line must extend as far as the terminal
indentation, i.e. there must be no further bare part of the connecting line
visible above the terminal edge (as shown in Fig. 4.11 C). Touching live
parts is dangerous to life. The stripped part of the connecting wire should
be shortened if necessary.
51/93
© Landis+Gyr AG
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