Connection Of Active Inputs; Connecting The Rs485 Interface; Check Of Connections - Landis+Gyr E650 Series 4 User Manual

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4.3.4

Connection of active inputs

4.3.5

Connecting the RS485 interface

4.4

Check of connections

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© Landis+Gyr
Extension board 421x offers 4 active inputs. These inputs provide a voltage
of 5 V.
The correct wiring of an input is over a switch to the ground as shown in
Figure 39 "Extension board 4210".
Do not apply voltage to any of these inputs. This will destroy the meter.
If you connect the RS485 interface you must not strip back the shielded
cables, e.g. to connect the individual wires to an external terminal block
(see figure below), as this considerably increases the likelihood of
interference.
Figure 58. How to connect RS485 correctly
It is also possible to use RS485 distributors instead of connecting the
RS485 cables directly to the meter.
Effects of connection errors
Only a properly connected meter measures correctly!
Every connection error results in a financial loss for the power company!
Before putting into operation, check again whether all meter connections
are connected correctly according to the connection diagram.
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