ABB Relion 650 Series Operation Manual page 89

1MRK 500 096-UUS B
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.
650 series
Operation manual
TestMode to disable after completing these tests. The
Set the parameter
Pickup LED stops flashing when the relay is no longer in test mode.
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Section 8
Troubleshooting
83