Hitachi 650 Series Operation Manual page 76

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Section 8

Troubleshooting

GUID-BBAEAF55-8D01-4711-A71D-BBC76B60BA3D V1 EN-US

Figure 49:

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.

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.

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 On .

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

output 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 Off after completing these tests. The Start LED

stops flashing when the relay is no longer in test mode.

and

1MRK500128-UEN Rev. H

to operate the actual

650 series

Operation manual

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