Field Voltage Supply; Input Opto-Isolators - GE MiCOM P40 Agile Technical Manual

Commissioning
MiCOM P40 Agile P442, P444
The alarm and out of service LEDs can be tested using the COMMISSIONING TESTS menu
column. Set cell [0F0E: COMMISSIONING TESTS, Test Mode] to 'Enabled'. Check that the
alarm and out of service LEDs illuminate.
It is not necessary to return cell [0F0E: COMMISSIONING TESTS, Test Mode] to 'Disabled'
at this stage because the test mode will be required for later tests.
Testing the trip LED
The trip LED can be tested by initiating a manual circuit breaker trip from the relay.
However, the trip LED will operate during the setting checks performed later. Therefore no
further testing of the trip LED is required at this stage.
Testing the user-programmable LEDs
To test the user-programmable LEDs set cell [0F12: COMMISSIONING TESTS, Test LEDs]
to 'Apply Test'. Check that all 8 LEDs on the right-hand side of the relay illuminate.
4.2.6

Field Voltage Supply

The relay generates a field voltage of nominally 48 V that should be used to energise the
opto-isolated inputs.
Measure the field voltage across the terminals given in Table 4. Check that the field voltage
is present at each positive and negative terminal and that the polarity is correct.
Repeat for terminals 8 and 10.
Supply rail
+48 Vdc
–48 Vdc
Table 4 - Field Voltage Terminals
4.2.7

Input Opto-isolators

This test checks that all the opto-isolated inputs are functioning correctly. P442 relays have
16 opto-isolated inputs and P444 relays have 24 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 status of each opto-isolated input can be viewed using cell [0020: SYSTEM DATA,
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.
Opto input 1
Opto input 2
Opto input 3
Opto input 4
Opto input 5
Opto input 6
Opto input 7
Terminals
P442
J7 & J8
J9 & J10
The opto-isolated inputs may be energised from an external 50 V battery in some
installations. Check that this is not the case before connecting the field voltage
otherwise damage to the relay may result.
Apply field voltage to terminals
P442
-ve
D1
D3
D5
D7
D9
D11
D13
P444
N7 & N8
N9 & N10
P444
+ve -ve
D2 D1
D4 D3
D6 D5
D8 D7
D10 D9
D12 D11
D14 D13
P44x/EN CM/Hb6
(CM) 9-13
+ve
D2
D4
D6
D8
D10
D12
D14