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8-3. Control output
(1) Lower limit and higher limit limiter setting
1) Output limiter limits minimum and maximum values of control output and helps secure minimum temperature, suppress
control overshoot, and achieve other objectives.
2) Lower limit value is given priority for output limiter setting. If minimum value is set above the higher limit value, the higher
limit value forcibly becomes the lower limit value + 1%.
Higher limit value cannot be set less than lower limit value + 1%.
(2) Proportional cycle
The correlation between proportional cycle time and control output are as shown in the following figure.
(This figure illustrates the case of heat action.)
1) Output 20%
2) Output 60%
(3) Control output characteristics
For heating, set to RA (reverse action) and for cooling set to DA (direct action).
(4) Two-position action
When conducting two-position action, frequent switching of output ON/OFF is prevented by utilizing hysteresis.
1) Hysteresis mode is CENT (~):
RA action DA action
ڹ: SV value ڹ: SV value
DF: Hysteresis DF: Hysteresis
2) Hysteresis mode is SVOF ():
RA action DA action
ڹ: SV value ڹ: SV value
DF: Hysteresis DF: Hysteresis
3) Hysteresis mode is SVON ():
RA actionDA action
ڹ: SV value ڹ: SV value
DF: Hysteresis DF: Hysteresis
During the time equivalent to 20%
when proportional cycle time is 100%,
output is ON and is OFF for the time
equivalent of the remaining 80%.
During the time equivalent to 60%
when proportional cycle time is 100%,
output is ON and is OFF for the time
equivalent of the remaining 40%.
Output ON
Output OFF
Proportional cycle time
20%
80%
Output ON
Output OFF
Proportional cycle time
60% 40%
DF
Output ON
DF
Output ON
DF
Output ON
DF
Output ON
DF
Output ON
DF
Output ON
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