Load-shedding steps Restore start Val setting Restore delay time setting
4 0.990 · Fn (49.5 Hz) 50000 ms
5 0.990 · Fn (49.5 Hz) 10000 ms
4.6.2.7 Signals
LSHDPFRQ Input signals
Table 896: LSHDPFRQ Input signals
Name Type Default Description
U3P SIGNAL - Three-phase voltages
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
BLK_REST BOOLEAN 0=False Block restore
MAN_RESTORE BOOLEAN 0=False Manual restore signal
LSHDPFRQ Output signals
Table 897: LSHDPFRQ Output signals
Name Type Description
OPERATE BOOLEAN Operation of load shedding
OPR_FRQ BOOLEAN Operate signal for under fre-
quency
OPR_FRG BOOLEAN Operate signal for high df/dt
START BOOLEAN Start
ST_FRQ BOOLEAN Pick-Up signal for under fre-
quency detection
ST_FRG BOOLEAN Pick-Up signal for high df/dt
detection
RESTORE BOOLEAN Restore signal for load restor-
ing purposes
ST_REST BOOLEAN Restore frequency attained
and restore timer started
4.6.2.8 LSHDPFRQ Settings
Table 898: LSHDPFRQ Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Load shed mode
1=Freq<
6=Freq< OR df/dt
1=Freq< Set the operation
mode for load
shedding function
Table continues on the next page
Protection functions 1MRS759142 F
938 REX640
Technical Manual
To Next Page
Loading...
