Connection Of R-S485 Interface - Landis+Gyr E650 Series User Manual

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4.3.1

Connection of R-S485 Interface

© Landis+Gyr AG
Only one wire or ferrule per terminal
Only one wire or ferrule with strand(s) may be connected in screwless
spring-loaded terminals. The terminal could otherwise be damaged or the
contact not properly made.
If a connecting wire must be disconnected again for any reason, this is
performed in the reverse sequence:
Fig. 4.12 Releasing connection from spring-loaded terminal
Damage to terminals
Never withdraw connecting wires with the terminal closed, since this could
damage the terminal.
If you connect the RS485 interface you must not strip back the shielded ca-
bles, e.g. to connect the individual wires to an external terminal block (see
figure below), as this considerably increases the likelihood of interference.
Electrical Cabinet
Avoid this
installation
RS485 Bus
Recom-
Electrical Cabinet
mended
installation
RS485 Bus
Fig. 4.13 How to connect RS485 correctly
It is also possible to use RS485 distributors instead of connecting the
RS485 cables directly to the meter.
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Electrical Cabinet
Removal of cable shield
for connection to terminals
can lead to pickup of stray
fields.
Ext. Terminal Block
Electrical Cabinet
Installation and De-Installation
Ext. Terminal Block