Mitsubishi Electric MELSEC iQ-F FX5 - Page 660

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35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.6 Function (PID Control Via Parameter)
Temperature rise completion judgment function
The temperature rise completion judgment is a function that judges whether the temperature process value (PV) is within the
temperature rise completion range. Judgment is made per sampling time.
The upper limit and lower limit values for the temperature rise completion range can be found by the following formula.
Temperature rise completion range upper value: Target value (SV) + Temperature rise completion range setting value
Temperature rise completion range lower limit: Target value (SV) - Temperature rise completion range setting value
Ambient temperature setting function
When the ambient temperature setting value is higher than or equal to/lower than the target value (SV), this function prevents
unnecessary execution of heating control or cooling control by setting either the output value for heating (MVh) or the output
value for cooling (MVc) to 0.
This function prevents heating control and cooling control in the following cases.
• When the ambient temperature (room temperature) is equal to or lower than the target value (SV), without
executing cooling control, the measured value (PV) goes down to the target value (SV).
• When the ambient temperature (room temperature) is higher than the target value (SV), without executing
heating control, the measured value (PV) goes up to the target value (SV).
■Control output when the ambient temperature setting function is enabled/disabled
The following figures show the control outputs when the ambient temperature setting function is enabled and disabled by
using timing charts.
• When the ambient temperature setting function is disabled
ON
OFF
Measured value (PV)
Temperature rise completion range setting value
Target value (SV)
Temperature rise completion range setting value
Temperature rise completion
soak time
Temperature rise not completed
Temperature rise
completed
Temperature rise
completion flag
OFF
ON
ON
OFF
Measured value (PV)
Target value
(SV)
Time
Control output
(heating control)
Control output
(cooling control)