ABB RET670 Commissioning Manual page 103

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
On the LHMI, these edit changes have immediate effect. This
means that the value changes directly when the up/down arrow is
pressed (i.e. there is no need to press the Enter key to effectuate the
change).
When navigating away from a LHMI forcing menu for an I/O board, the user is
prompted to either leave the signals forced, or to revert all of them back to the
unforced state.
IEC15000022 V1 EN-US
It is possible to power-cycle the IED in this state without losing the
forcing states and values. This means that once a signal is forced,
and the IED remains in IED test mode, the input or output will
appear "frozen" at the value selected by the user, even if the IED is
switched off and back on again.
Freezing a signal value without changing it
• Set the status of a signal to Forced, in the forcing menu that corresponds to the
I/O card in question. See example of LHMI menu in figure
Section 10
Testing IED operation
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