Toshiba GR200 Series Instruction Manual page 327

Table 2.21-2 Constant value at each setting of IDMT curve
Set item
IDMT
User-programmable
(Original)
Reset feature
The user should set the time for resetting. Figure 2.21-3 shows that examples of the pick-up
and the drop-off relevant to both the fault occurrences and the operation time. The value of the
time counter furnished in the OV1 element is incremented if faults occur.
As for an intermittent fault (the former in the figure), the time counter will not reach the
trip level. In the other words, the operation of the OV1 element is paralyzed in the reset time
set by [TOV1R].
If a series of fault occurs repeatedly (the latter in the figure), and if the value of the time
counter reaches at trip level, the OV1 element will issue a trip command after a certain delay.
After issuing the trip command, if a series of fault completely disappears after issuing the trip
command, the value of the time counter will be expired after the reset time [TOV1R].
When the user requires resetting the operation of the OV1 element immediately, setting
zero for the settings [TOV1R] is needed. Consequently, when a voltage falls below the reset
threshold (drop-off), the operation of the OV1 element is reset promptly.
k
1
0.00000 – 500.00000
by 0.00001 step
- 304 -
a
1
0.00000 – 10.00000
by 0.00001 step
6F2S1914 (0.49)
C
0
0.00000 – 10.00000
by 0.00001 step
GRL200 (Soft 033 & 037)