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scheme switch [DFRQ1-UseFor]. However, when an alarm signal is required in place of the
trip signal, the user should set Alarm for scheme switch [DFRQ1-UseFor]. The TRC function
is discussed separately. (See Chapter 2.23)
DFRQ scheme logic
(iv)
Figure 2.19-4 shows the scheme logic of the DFRQ function. Each stage operates independently.
PLC connection point "DFRQ1-BLOCK" is provided to block the stage1; hence, the user can
connect an external signal to this PLC connection point when the external signal is provided
to block the stage 1. (For more information, see Chapter PLC function →p. 709)
The signal of the under-voltage block (FRQBLK) element is provided from the FRQ logic.
From FRQ
NON FRQBLK
&
RISE
DFRQ1
1
DOWN
&
OverFrq
UnderFrq
FFRQ1-Chara
&
RISE
DFRQ2
1
DOWN
&
OverFrq
UnderFrq
DFRQ2-Chara
&
RISE
DFRQ8
1
DOWN
&
OverFrq
UnderFrq
DFRQ8-Chara
On
DFRQ1-EN
On
DFRQ2-EN
On
DFRQ8-EN
1
800011EBB0 DFRQ1-BLOCK
1
810012EBB0 DFRQ2-BLOCK
1
870018EBB0 DFRQ8-BLOCK
Figure 2.19-4 Scheme Logic of Frequency Rate-of-change Protection
8000111C23
≥1
&
&
8100121C23
≥1
&
&
8700181C23
≥1
&
&
- 209 -
8000111BB1
8000111B60
800011EBB1 FRQ-S1-OPT
Trip
DFRQ1-UseFor
Alarm
8100121BB1
8100121B60
810012EBB1 FRQ-S2-OPT
Trip
DFRQ2-UseFor
Alarm
8700181BB1
8700181B60
870018EBB1 FRQ-S8-OPT
Trip
DFRQ8-UseFor
Alarm
6F2T0207 (0.01)
DFRQ-S1-OPT
&
≥1
DFRQ-OPT-TRIP
&
DFRQ-OPT-ALARM
DFRQ-ARC-BLOCK
DFRQ-S2-OPT
&
&
DFRQ-S8-OPT
&
≥1
&
GRE200 (5,6)
To TRC
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