ABB Relion 670 series - How to Undo Forcing Changes and Return the IED to Normal Operation; Undo Forcing by Using TESTMODE Component; Undo Forcing by Using LHMI; Undo Forcing by Using PCM600

10.8.4 How to undo forcing changes and return the IED to normal
operation
GUID-00E2BAD8-A29E-4B9D-80E6-E12F59E019BD v1
Regardless of which input/output signals have been forced, all forced signals will return to their normal
states immediately when the IED is taken out of test mode.
When the forcing is removed by exiting from IED test mode, both input and output
signals may change values. This means that logic input signals may activate functions in
the IED and that output relays may change state, which can be potentially dangerous.
10.8.4.1 Undo forcing by using TESTMODE component
GUID-CA5CCA57-DFFF-4362-AC1D-08738D2BA45F v2
• If the IED test mode was entered through the test mode function block:
1. Deactivate the control input on that block.
This immediately undoes all forcing, regardless of how it was accomplished and disabled all the way
to force signals.
10.8.4.2 Undo forcing by using LHMI
GUID-55199606-E70D-49B1-885D-251700FB562B v1
• If the IED test mode was enabled to using the LHMI:
1. Set IEDTestMode to Off in the LHMI menu.
2. Exit from the menu and click Yes in the Save dialogue box.
This immediately undoes all forcing, regardless of how it was accomplished and disabled.
10.8.4.3 Undo forcing by using PCM600
GUID-CE7FD186-99FC-41C8-910F-894A57037777 v2
1. Uncheck Forcing Session under the menu IED.
IEC15000031 V1 EN-US
2. Click Yes in the confirmation dialogue box.
PCM600 will revert all forced signals back to unforced and the real signal values will immediately
take effect again.
Section 10 1MRK 504 165-UUS Rev. J
Testing IED operation
92 Transformer protection RET670
Commissioning manual
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