Toho-electronics TTM-339 Manual do Utilizador descarregar pdf (Página 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

0A0A

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%

Time

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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Toho-electronics TTM-339 Manual do Utilizador Página 13