STEP ET Series - P51 Group Process PID

Chapter 7 Parameter Explanation
ET/EP/EH Series Intelligent Flexible Driver Manual
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Figure 7-24 Open Loop Main and Auxiliary Reference Operation 1
Process open loop synthetic reference f
com
= main reference f
m
- auxiliary reference f
a
5:Take the maximum value Take the maximum value of the main reference f
m
and auxiliary
reference f
a
.
Figure 7-25 Open Loop Main and Auxiliary Reference Operation 4
Process open loop synthetic reference f
com
= Max{main reference f
m
, auxiliary reference f
a
}
6:Take the minimum value Take the minimum value of the main reference f
m
and auxiliary
reference f
a
.
Figure 7-26 Open Loop Main and Auxiliary Reference Operation 5
Process open loop synthetic reference f
com
= Min{main reference f
m
, auxiliary reference f
a
}
Note: When the frequency corresponding to the synthesis value f
com
exceeds the upper and lower
frequency limits, the output frequency is limited to the upper and lower limits.
7.7.2 P51 group Process PID
PID control is a common method for process control, which adjusts the inverter output frequency by
performing proportional, integral, and differential operations on the deviation between the control
feedback signal and the target quantity signal, constituting a negative feedback system to stabilize
the control quantity on the target quantity. Applies to process controls such as flow control, pressure
control, and temperature control. The basic principle block diagram of control is as follows.