172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
225
(SV), the Manipulated output value (MV) is turned ON. To use the ON/OFF control,
set the Proportional band [heat-
side] to “0.”
In the ON/OFF control the output is turned on and off around the Set value (SV) and
the output may be turned on and off too frequently for a small change of temperature.
This is called “chattering” and may reduce the life of the output relay. To prevent this,
ON/OFF differential gap should be properly set.
This explanation applies to
“Reverse action” (heating control).
The value of the ON/OFF action differential gap is a deviation from the Set value
(SV). This gap can be set individually above and below the Set value (SV).
For example, in case of a Reverse action (heating control), assuming that the Set
value (SV) is 100
C with a ON/OFF action differential gap (upper) of 5
C, the
Manipulated output value (MV) turns off at 105
C.
In case of ON/OFF action, the Output changing rate limiter will be unavailable.
Cooling control with ON/OFF action
The process of Input 1 can be controlled with the ON/OFF action for the Cooling side
(direct action) by setting zero to the Input 1_Proportional band [heat-side]
after “0:
PID control (d
irect action)” is set in Function block No. 51: Input 1_Control action
(Engineering mode).
The process of Input 2 can be controlled with the ON/OFF action for the Cooling side
(direct action) by setting zero to the Input 2_
Proportional band after “0: PID control
(d
irect action)” is set in Function block No. 52: Input 2_Control action (Engineering
mode).
The action is the same as above, but the ON/OFF position of the Manipulated output
value (MV) becomes opposite. The ON/OFF action differential gap can be set similarly.
Heating/Cooling control with ON/OFF action
Go to “Input 1_Control action” in Function block No.51 (Engineering mode).
Select any one from “2: Heating/Cooling PID control [water cooling]”, “3: Heating/
Cooling PID control [air cooling
]”, or “4: Heating/Cooling PID control [Cooling linear
type
]” and set “0” at the Input 1_Proportional band [heat-side].
Then, the controller starts Heating/Cooling control with ON/OFF action.
Содержание SC-F71
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