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

3 SPECIFICATIONS

3.2.2 Reverse/Forward action select function

3.2.3 RFB limiter function

3.2.4 Sensor compensation function

3 - 10
Downloaded from ManualsNet.com
With the Q64TC, "reverse action" or "forward action" can be selected to perform the
PID operations.
(1) Q64TC default
The default is set at "reverse action" for the Q64TC.
When performing the PID operations with the "forward action," set to the forward
action in Forward/reverse action setting (buffer memory address: 36
96 ).
H
(2) Reverse/forward action control details
(a) Reverse action : Used for heating control to increase temperature.
(b) Forward action : Used for cooling control to decrease temperature.
(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.
(1) Sensor compensation function
The sensor compensation function compensates the difference between the
temperature process value and actual temperature caused by measurement
conditions.
(2) Sensor compensation value setting
When there is a difference between the temperature process value and actual
temperature, the full-scale percentage (-50.00 to 50.00%) is set in Sensor
compensation value setting (buffer memory address: 2D
sensor compensation value.
For example, when the input range is at -200°C to 200°C and there is a 2°C error,
the full-scale is 400°C (200°C-(-200°C)=400°C).
Therefore, 2/400 x 100 = 0.5% is set. ("50" is set in the buffer memory.)
search engine
MELSEC-Q
, 56 , 76 ,
H H H
, 4D , 6D , 8D ) as the
H H H H
3 - 10