TOHO ELECTRONICS TTM200 - Manual (Page 169)

48-7009-E 6-21
■ Primary control proportional cycle
SEt04
CNt
Setting content Initial value
20 t1 0.1 to 120.0 (seconds)
20.0
(1.0)
( ) When OUTPUT1 is SSR drive.
Set the primary control proportional cycle.
Relay contact output, voltage output for SSR drive or open collector output has only the state of ON or OFF for output, and
thereby no proportional operation is offered.
Thus, to solve the issue, concept of time proportional operation is applied.
In the time proportional operation, ON/OFF is repeated in a proportional cycle (time cycle), where the ON state is maintained
for a particular time period and the OFF state for the rest of the period.
Example: When the proportional cycle is 20 seconds and the operating amount (MV) is 40 %, the ON/OFF period is as
follows.
ON: 8 seconds
OFF: 12 seconds
ＯＮ ＯＦＦ
Proportional cycle
■ Anti-reset windup (ARW)
SEt04
CNt
Setting content Initial value
21 ARW
0.0 to 110.0 (%)
Function turned off at 110.0 (%) setting
110.0
Set the max. value of calculated integral operating amount.
Setting example: When ARW is set to 50 %, the operating amount accumulated in the integral operation reaches 50 %.
Anti-reset windup is an operation to suppress excessive integration of integral operation.
It is used to prevent overshoot, when a control contains an integral operation, by limiting the range of the effective integral
operation.
Note
(1) When ARW is set to 0 %, integral operation is ineffective.
(2) The value of ARW is automatically set by auto-tuning after setting tYP (PID control type) to “2” (type C: disturbance
suppression function).