Chapter 6 Function Introduction Shenzhen Hpmont Technology Co., Ltd
―60― HD20 Series Inverters User Manual
6.2.5 Group F04 Process PID Control
Closed-loop can be constituted not only by analogue reference and feedback but also by pulse
reference and feedback. Generally, the process PID control mode is used to regulate pressure,
liquid level and temperature etc.
The maximum analogue input or maximum pulse input frequency (F16.17) corresponds to the
maximum output frequency (F00.06). The process PID control is shown in the following figure:
No. Name Description Range
factory setting
Process PID control selection
0: PID control is disabled.
1: PID control is enabled.
Reference source selection
0: Digital reference. It is the value of F04.03 reference.
1: Analogue reference. It is the value of the analogue input voltage AI reference, and refer to Group
F16.
2: Terminal pulse reference. It is the value of the terminal pulse input reference, and maximum input
pulse frequency corresponding to 10V of the PID reference.
Feedback source selection
0: Analogue feedback.
1: Terminal pulse feedback.
Setting digital reference
It defines the process PID regulator reference. When F04.01 = 0 (digital reference), it is enabled.
F04.05 Integral time (I) 0.01
10.00
1.00s
F04.06 Integral upper limit 0.00
upper limit
F04.07 Differential time (D) 0.00
10.00
0.00s
F04.08 Differential amplitude limit value 0.00
upper limit
F04.09 Sampling cycle (T) 0.01
50.00
0.10s
F04.04, F04.05 and F04.07 define the process PID parameters.
F04.06 defines the process PID integral upper limit.
F04.08 defines the process PID differential amplitude limit value.
F04.09 defines the sampling cycle of feedback value and the PID regulator calculates once in each
sampling cycle.
• When F04.07 = 0, the differential is disabled.
Output
PID
Bias
limit
Reference value
Feedback value
+
-
Closed-loop control
characteristics
Amplitude
limit control
Output filter
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