Toshiba GR200 Series - 2.18.3 Scheme logic

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 282 -
2.18.3 Scheme logic
Figure 2.18-2 shows the scheme logic for THM. THM has two thresholds; threshold “A” is used
for alarming, threshold “T” for tripping. The name of the output signal for the alarm is termed
THM-OPT-ALARM and that of the output signal for tripping is termed “THM-OPT-TRIP”.
The threshold level for the alarm is set using setting [THM-Alarm] as a percentage of the
tripping threshold. The alarm signal is disabled when Off is set for scheme switch [THMA-EN].
The trip signal is prevented when Off is set for scheme switch [THMT-EN]. PLC signals
THMA_BLOCK and THMT_BLOCK are used to block the operation of THM.
Figure 2.18-2 THM Logic
When wishing to have a test about pre-load current (Ip), the user should set a test value for
the setting [THM-IP] followed by setting [THM-Test]=On.
THMA-EN
8000011C23
THM
A
B
&
&
1
THMT-EN
ON
ON
8100021C23
1
&
&
8000011B60
8100021B60
THMA-UseFor
&
≥1
THM-OPT-TRIP
THM-OPT-ALARM
&
800001EBB0 THMA_BLOCK
810002EBB0 THMT_BLOCK
Alarm
Trip
8300021B23
8400011B23
THM-ARC-BLOCK
To TRC