SL7000 User Guide
25
CO Common
35
PO Common
40
PI Common
27
Control input 1
28
CI Common
The control output and input terminal blocks accept cables up to 2.5mm².
The pulse output and input terminal blocks accept cables up to 1.5mm².
Note:
Depending on meter factory configuration, some of the inputs and outputs shown above may not be
available.
Communication wiring
Both RS232 and RS485 type communication ports use RJ45 connectors:
It is recommended that twisted and shielded cables are used for communication line wiring and that one end of
the cable shield should be connected to ground.
Pin
RS232 Function
RS485 Function
1
VMDM 10V -10/+20%
VMDM 10V -10/+20%
2
No connection
RX -
3
No connection
No connection
4
RX
RX +
5
TX
TX +
6
0V - Ground
0V - Ground
7
DTR
TX -
8
No connection
No connection
9.6.
Using aluminium cables
The certification of meters in respect of current rating is valid only when used with
copper supply
and load cables
of the
correct diameter
. If aluminium cables are to be used, the meter current
rating will be downgraded, and the meters should be ordered with plated terminals instead of
standard brass terminals.
Meters with standard brass terminals should not be connected directly to aluminium mains cables, as this may
cause corrosion due to electrolytic action.
If a meter with brass terminals must be used in premises with aluminium cables, it is highly advisable to:
•
Terminate the aluminium cables in a suitable junction box close to the meter.
•
Complete the connections to the meter with copper cables > 0.5m in length.
Alternatively, use suitable copper cable-sheaths on the terminating ends of the aluminium cables.
This will prevent terminal corrosion, and allow the meter to be used at its certified current rating.
