2 - Electrical connections
2.3 TYPICAL INSTRUMENT WIRING
V~ |
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Load |
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| Solid |
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4…20mA |
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| 0P4 | relays |
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Retransmission |
| RX/TX |
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RS485 |
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| 18V | OP2 | |
Supervisory | [4] |
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| 0.2 A T |
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| Fuse |
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Power | 1 | V~ 2 | 3 | 4 | 5 | |
supply |
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switch |
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L |
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Supply V~ |
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N |
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Fuse [5]
V~
Coil of the load
contactor
12
A 
6
Pt100 
B
B
Thermocouple
DC voltage
Current
2.5Ω external shunt resistor PV
2 wire transmitter
B
Notes:
1] Make sure that the power supply voltage is the same indicated on the instrument.
2] Switch on the power supply only after that all the electrical connections have been completed.
3] In accordance with the safety reg- ulations, the power supply switch shall bring the identification of the relevant instrument. The power supply switch shall be easily accessible from the operator.
4] The instrument is protected with a 0.2 A~ T fuse. In case of failure it is suggested to return the instrument to the manufacturer for repair.
5] To protect the instrument internal circuits use:
-2 A~ T fuses for Relay outputs
-1 A~ T fuses for Triac outputs
6] Relay contacts are already pro-
tected with varistors.
Only in case of 24 V ~ induc- tive loads, use model
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