Cascade Control Function - Mitsubishi Q Series User Manual

3 SPECIFICATIONS

3.2.13 Cascade control function

Master
(CH1)
Slave
(CH2)
Thermocouple
Nozzle Part
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(1) Cascade control function
The cascade control can perform the control with the channel 1 as master and
the channel 2 as slave.
The master performs PID operations by inputting the measured value (PV1) of
targets that are controlled at the last, converts the manipulated value (MV1) to
cascade signals by bias and gain, and corrects the set value (SV2) of the slave.
The slave performs the PID control according to the set value (SV2) corrected
into the cascade signals.
-
PV1
+
SV1
-
PV2
+
SV2
+
The cascade control is suitable for when there is a large time delay between the
heater and the part where needs temperature stabilized.
Example) Resin temperature control of a nozzle part of an extrusion machine
Q62HLC
-
PV1
+
SV1
-
PV2
+
SV2
+
PID operation
PID operation
Gain
Cascade
signals
PID operation
PID operation
Gain
Cylinder part
MELSEC-Q
MV1
Cascade
ON
MV2
Bias
MV1
MV2
Bias
Heater
Thermocouple
Extrusion
machine
Cascade
OFF
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