TOHO ELECTRONICS TTM-339 - Manual (Page 13)

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Example:
Assume the following for various settings and PV:
PV = 120

C, operation amount limiter point 2 = 75.0%, current value limiter point 2 = 10.0 A, present operation
amount = 60.0% and AHC = 1.0 A.

If measured current valued = 15 A:
Based on the relation [0 to present operation amount (60.0%) = 0.0 to measured current value (15.0 A)], the
operation amount [current value limiter point 2 (10.0 A) - current limiter sensitivity (1.0 A)] is to be determined.
The calculation results in the operation amount of 36.0%.
15A
Current
0% 60.0%
15A
Current
0% 60.0% 36.0%
(10A-1A =)9A
0A 0A
Operation
amount
Operation
amount
* The operation limiter point 2 = 75.0%; as this amount is larger than the operation amount resulted from the
calculation, the operation amount is eventually limited at 36.0%.
4.14.3 Other operation amounts limiter setting
4.14.3-1 Primary/secondary control operation amount change limiter increase setting
Setting items:
Primary/secondary control operation amount change limiter increase setting: 0.0 to 549.9 [%] (no function by
setting at 0.0 [%])
Operation description:
The increase rate of variation of a calculated operation amount is limited.
The operation amount allowed to increase for a second is set in percent.
The setting is effective during AT.
If the setting is changed, control results also changes; redo AT.
If the setting is 100%, the variation increases only up to 20 % for input sampling (200 ms).
To increase up to 100% for input sampling (200 ms), set at 500%.
(1 second

200 ms)

100% = 500%
Calculated operation
amount
Limited operation
amount
100%
100%
0%
0%
Time