Reverse/Forward Action Select Function; Rfb Limiter Function; Sensor Compensation Function - Mitsubishi Q Series User Manual

3 SPECIFICATIONS

3.2.3 Reverse/forward action select function

3.2.4 RFB limiter function

3.2.5 Sensor compensation function

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With the Q62HLC, "reverse action" or "forward action" can be selected to perform the
PID operations.
(1) Q62HLC default
The default is set at "reverse action" for Q62HLC.
When performing the PID operations with the "forward action", set to the
forward action in the forward/reverse action selection (buffer memory address:
54, 86).
(2) Reverse/forward action control details
(a) Reverse action : This is the operation to decrease the manipulated value
(b) Forward action : This is the operation to increase the manipulated value
REMARK
The Q62HLC doesn't respond to heat cooling control when 2 channels try to
control one object, the temperature isn't stabilized, and cannot be controlled.
(1) RFB (Reset feed back) limiter function
The RFB limiter function limits the PID operation result (manipulated value :
MV) not to exceed the valid range by the integral control action when an error
continues for a long time.
With the RFB limiter function, if the PID operation result exceeds the
upper/lower output limiter value, the amount exceeded is fed back to the
integral value and the PID operation result is kept at the limit value.
Setting is not necessary as the RFB limiter function is automatically operated at
PID control operation.
(1) Sensor compensation function
The sensor compensation function compensates the difference among the
measured temperature, actual temperature caused by measurement
conditions.
(2) Sensor compensation value setting
When there is a difference between the measured and actual temperature, the
temperature (-500.0 to 500.0 ) is set to the sensor compensation value setting
(buffer memory: 45, 77) as the sensor compensation value. When there is a
difference between the measured and actual humidity, pressure, flow rate, etc.,
the full-scale percentage (-50.00 to 50.00%) is set to the sensor compensation
value setting (buffer memory: 45, 77) as the sensor compensation value.
Example; When there is a 0.3V error at the input range, 0 to 10V, 0.3÷10×100=
3% is set. This comes from the full-scale 10V. ("300" is set in the buffer memory.)
according to the increase of the measured value. Used for
heating control to increase temperature.
according to the increase of the measured value. Used for
cooling control to decrease temperature.
MELSEC-Q
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