Toshiba GR 200 Series, Instruction Manual, Page: 181 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 160 -
(v)
Operate time of DT
The operate time in the DT is a constant.
Time characteristic
The user should set
DT
for the scheme switches [
OC1-Timer
]. The value of the required operate
time is set for the setting [
TOC1
] in the range 0.00–300.00s.
Instantaneous activation
The operate time of the instantaneous characteristic is achieved by setting zero for the [
TOC1
],
but the instantaneous one can also obtained when the logic signal ‘1(High)’ is programmed to
be injected at PLC connection point “OC1_INST_OP”.
(vi)
Reset time of IDMT
Programming the reset time characteristic is available in the IEEE, US standards. It is also
allowed in original (user-programmable) inverse-time-reset characteristic. To get this
characteristic, the user should set
DEP
for setting [
OC1-Rtimer
]†. The following equation
defines the reset time for the inverse-time-reset characteristic. (ref. IEC 60255-151):
t(I) = RTMS × [
kr
1 − (𝐼 𝐼
𝑠
⁄ )
β
]
(2.5-2)
where,
t = time required for the element to reset fully after complete operation (seconds),
I = energizing current (amperes),
Is = threshold setting (amperes),
RTMS = time multiplier setting for resetting,
kr = time required to reset fully after complete operation when the energizing current is
zero (seconds),
β = constants defining curve.
For the IEEE standard, the user should use the setting [
OC1-RTMS-IEEE
] (incidentally,
the default value is 1.000). For the US standard and the original, settings [
OC1-RTMS-US
] and
[
OC1-RTMS-ORG
] are provided, respectively (For more information w.r.t the value for kr and
β, see Table 2.5-4; Figure 2.5-6 shows the characteristic curves).
†Note: To select the inverse-time-reset characteristic, set [
OC1-Rtimer
]=
DEP .
Conversely set [
OC1-Rtimer
]=
DEF
to select definite-time-reset characteristic,.
Note: For the setting [
OC1-Rtimer
]=
DEP
(inverse-time-reset), the integrated value will
be reduced in accordance to the magnitude of an energized current, when the