Hitachi Relion 670 Series Operation Manual page 95

1MRK500127-UUS Rev. M
A
GUID-BBAEAF55-8D01-4711-A71D-BBC76B60BA3D V1 EN-US
Figure 63:
1 Contact current
2 Contact voltage drop
3 Load
4 Supply voltage
• To check the status of the output circuits driving the output relay via the LHMI, select Main menu /
Test/Binary output values and then navigate to the board with the actual binary output to be
checked.
• Test and change the relay state manually.
1.
2.
3.
An initially high contact resistance does not cause problems as it is reduced quickly by the electrical
cleaning effect of fritting and thermal destruction of layers, bringing the contact resistance back to the
mOhm range. As a result, practically the full voltage is available at the load.
670 series
Operation manual
Output relays, especially power output relays, are designed for breaking high currents. Due to
this, layers of high resistance may appear on the surface of the contacts. Do not determine
proper functionality of connectivity or contact resistance by measuring with a regular hand-
held ohm meter.
V
1
4
Testing output contacts using the voltage drop method
To set the IED to test mode, select Main menu/Test /IED test mode/TESTMODE:1 and set
the parameter TestMode to enable .
To operate or force the output relay to operate, select Main menu/Test/Forcing /Binary
output values and then navigate to the board with the actual binary output relay to be
operated/forced.
Select the BOn to be operated/forced and use
relay.
Each BOn is represented by two signals. The first signal in LHMI is the actual value 1 or 0 of
the output, and in PCM600 a lit or dimmed diode. The second signal is the status Normal or
Forced. Forced status is only achieved when the BO is set to Forced or operated on the LHMI.
Set the parameter TestMode to disable after completing these tests. The Pickup LED
stops flashing when the relay is no longer in test mode.
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2
3
and or
Section 9
Troubleshooting
to operate the actual output
89