Operation Guide P341/EN O/B11
Commissioning and CHAPTER 3
Maintenance Page 13/80
MiCOM P341
Supply Rail Terminals
+ve F7 & F8
–ve F9 & F10
Table 4: Field voltage terminals
4.2.5 Input opto-isolators
This test checks that all the opto-isolated inputs are functioning correctly. The P341
relays have 8 opto-isolated inputs.
The opto-isolated inputs should be energised one at a time. Ensuring correct polarity,
connect the field supply voltage to the appropriate terminals for the input being
tested. The opto-isolated input terminal allocations are given in Table 5.
Note: The opto-isolated inputs may be energised from an external dc auxiliary
supply (e.g. the station battery) in some installations. Check that this is not
the case before connecting the field voltage otherwise damage to the relay
may result. If an external 50Vdc supply is being used it will be connected to
the relay’s optically isolated inputs directly. However, if the auxiliary supply
rating is either 110 – 125Vdc or 220 – 250Vdc, it will be connected to the
optically isolated inputs via an external resistor box (our product number
GJ0229 006 or 007). If an external supply is being used then it must be
energised for this test but only if it has been confirmed that it is suitably rated
with less than 12% ac ripple.
The status of each opto-isolated input can be viewed using either cell
[0020: SYSTEM DATA, Opto I/P Status] or [0F01: COMMISSION TESTS, Opto
I/P Status], a ‘1’ indicating an energised input and a ‘0’ indicating a de-energised
input. When each opto-isolated input is energised one of the characters on the
bottom line of the display will change to the value shown in Table 5 to indicate the
new state of the inputs.
Apply Field Voltage
to Terminals
Input
-ve +ve
Cell [Opto I/P Status] Value
Opto input 1 D1 D2 0000000000000001
Opto input 2 D3 D4 0000000000000010
Opto input 3 D5 D6 0000000000000100
Opto input 4 D7 D8 0000000000001000
Opto input 5 D9 D10 0000000000010000
Opto input 6 D11 D12 0000000000100000
Opto input 7 D13 D14 0000000001000000
Opto input 8 D15 D16 0000000010000000
Table 5: Opto-isolated input terminals
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