Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 96/165
© Woodward
Reverse/Reduced Power Monitoring
NOTE
All percentage indications of the power are in relation to the generator rated power (Parameter 28).
Function:
"Real power not within the permissible range"
The real power measured in a single phase or in three phases is below the configured limit value for the mini-
mum load or below the configured value for reverse power. By configuring positive threshold values (minimum
load monitoring), a shutdown can be performed before the generator goes into reverse power.
Parameter
122
Rev./red.power
monitoring ON
Generator reverse/reduced power
ON/OFF
ON
................ Generator real power monitoring is enabled. The subsequent screens
of this function are displayed.
OFF
.............. Generator power monitoring is not enabled. The subsequent screens
of this function are not displayed.
Parameter
123
Rev./red.power
resp.value –00%
Generator reverse/reduced power: limit
-99 to 99 %
Reverse power monitoring:
When the real power falls below the negative percen-
tage limit value, the unit recognizes a reverse power condition. The
unit issues a class F3 a alarm.
Reduced power monitoring:
When the real power falls below the positive percen-
tage limit value, the unit recognizes a reduced power condition. The
unit issues a class F3 a alarm.
Tripping of class F3 alarm
Parameter
124
Rev./red.power
Delay 00.0s
Generator reverse/reduced power: delay
00.1 to 99.9 s
The reverse/reduced power monitoring threshold limit must be exceeded, without
interruption, for the time period configured here before the configured relay will be
energized.
