Manual 37351A
MFR 11 Packages - Protection Relay
© Woodward
Page 17/59
Chapter 4.
Functional Description
Control Inputs
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NOTE
The subsequent input "Blocking of protective functions / remote acknowledgement" does not exist in
the 690 V-version.
Blocking of protective
functions / Remote ac-
knowledgement
Terminal 5/6
Energizing this discrete input disables various protective functions. This
functionality may be desired if the control is used for generator protection.
This keeps the control from recognizing fault conditions (i.e. undervoltage,
underfrequency) when the generator is not operating. If blocking of these
protective functions is not required, the discrete input should not be con-
nected to any potential source.
The following protective functions cannot be blocked via this discrete
input:
•
Overvoltage monitoring
•
Overfrequency monitoring
•
Zero voltage monitoring
External acknowledgement
of the relays via the discrete
input "Blocking of protec-
tive functions / remote ac-
knowledgement"
External
Clearing ON
If the unit should not automatically reset the relays after the fault is no
longer present, the parameter "
Auto clearing Relays
" must first be
configured "
OFF
" (refer to "Auto Acknowledgement of the Relay" on
page 42).
OFF
............. Alarms that cannot be blocked will not automatically reset af-
ter the fault condition is no longer present. Pressing the
"Clear" button resets the relays.
ON
............... All alarm messages are reset if terminals 5/6 ("Blocking of
protective functions / remote acknowledgement") are ener-
gized. Alarms that cannot be blocked are only reset after the
fault is no longer present.
