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Project 2187 Drawing No. CI-3K51101 Rev 10
DMR 2720 18/07/11
Modbus is a Trademark of Schneider Automation Inc. Other Trademarks or company
names mentioned herein are the property of their respective owners.
provision for shorting links to be made across CTs to permit easy replacement of a unit should this ever be
necessary.
All connections are made to screw clamp terminals. Terminals are suitable for copper wires only and will accept
one stranded 0.05 - 2.5mm
2
(30 - 12AWG) stranded or solid core cables. Instruments are intended for panel
mounting. Terminals must be enclosed within the panel. Use wire rated at 600V for main terminals, 60°C
minimum temperature. Terminal screws are fully tightened for shipment and must be undone before wire
insertion. Terminal screws should be tightened to 0.5 Nm (4.4 lbf in) only.
Additional considerations for three wire systems
The neutral terminal (terminal N) is indirectly connected to the voltage input terminals (terminals L1, L2, L3).
When connected to a three wire system the neutral terminal will adopt a potential somewhere between the
remaining lines. If external wiring is connected to the neutral terminal it must be connected to either the neutral
line or earth (ground) to avoid the possibility of electric shock from the neutral terminal.
Fusing
This unit must be fitted with external fuses in voltage and auxiliary supply lines. Voltage input lines must be
fused with a fast blow fuse 1A maximum. Auxiliary supply lines must be fused with a slow blow fuse rated 1A
maximum (if product is powered line-to-line, ensure both lines are fused). Choose fuses of a type and with a
breaking capacity appropriate to the supply and in accordance with local regulations.
A suitable switch or circuit breaker conforming to the relevant parts of IEC 60947-1 and IEC 60947-3 should be
included in the installation. It should be positioned so as to be easy to operate, in close proximity to the
equipment, and clearly identified as the disconnecting device.
Earth/Ground Connections
For safety reasons, current transformer secondary connections should be grounded in accordance with local
regulations. Under no circumstances should the product be operated without this Earth connection.
8. Auxiliary and Output Connections
8.1 Auxiliary Supply
The auxiliary supply is rated at 100-400V AC ± 10%, 120-350 DC ±20%. The Integra Ci3 digital meter
should ideally be powered from a dedicated supply, however it may be powered from the signal source
providing the source remains within tolerance of the auxiliary supply voltage range.
8.2 Output Connections
8.2.1 RS485 module Option
The recommended cable between the RS485 master and the Integra Ci3 digital meter is two core
screened cable. Preferably select a cable specifically recommended for RS485 use (for example Belden
9860, 8761) although for shorter distances of a few metres most two core screened cables will usually
be satisfactory. Cable length (transmission distance) can be up to 1200 metres in good conditions.
Electrical interference or other adverse conditions may reduce the maximum cable length possible.
8.2.2 Pulse Relay Module Option
Up to 2 solid state relays can be fitted, if there is no RS485 module fitted. Relay rating is 250V, 50mA,
maximum. Lines connected to these terminals must be either short in length or filtered where
appropriate.