Toshiba GR200 Series - 2.2.5 Differential current monitor (DIFL-IDSV)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 37 -
2.2.5 Differential current monitor (DIFL-IDSV)
Monitoring function for differential current (DIFL-IDSV) is provided so that detecting
spuriousness in the differential current is feasible during the CT circuit failure. The user can
adjust the removal period for issuing using setting [TDIFL-IdSV]. To operate the DIFL-IDSV
function, the user should set scheme switch [DIFL-IdSV-EN] On; setting [DIFL-IdSV] is also
provided to set the monitoring level. As shown in Figure 2.2-8, the results of the monitoring
function are provided at PLC connection point “DIFL-IDSV”; they are transferred to the
automatic supervision function, which we shall discuss separately.
DIFL
-SV
A
B
C
DIFL-IDSV-EN
On
8000031C20
8100031C21
8200031C22
AMF_OFF
From AMF
DIFL-IDSV-A
DIFL-SV_BLOCK
830003EBB0
8300031BB2
≥1
&
&
&
0 to 300s
t 0
TDIFL-IdSV
t 0
t 0
≥1
8000001B61
8100001B62
8300001B64
8200001B63
DIFL_BLOCK
8F0000EBB4
8F00001BB2
≥1
&
≥1
DIFL-IDSV-B
DIFL-IDSV-C
DIFL-IDSV
Figure 2.2-8 Differential current monitor logic
If the monitoring function is unrequired, the user can remove the operation using PLC
connection point “DIFL-SV_BLOCK”. The monitoring function can also be stopped when the
AMF_OFF signal† is injected.
†Note: The user can switch off the monitoring function during the test. To generate the
AMF_OFF signal, set Off for setting [A.M.F]. For the operation, see chapter User
interface: Test sub-menu .