Procon V3D - Pressure Regulation Example

H - I - J PROGRAMMER’S MANUAL V8.94.11-
- 81 -
Regulation on pressure using a 4 to 20 mA pressure remote transmitter
Let the pressure remote transmitter be of measuring range of 0 to 10 bar, the pressure to be kept should be adjustable
between 4 and 8 bar.
The pressure to be kept should be 6 bar, reaching the pressure should last at least 30 seconds after start
(for taking care of the supplying unit e g. the well)
The pump starts to convey from 20 Hz on, cannot be driven above 50 Hz, it cannot be operated more than 1 minute at
the minimum frequency (it must be stopped), but in the case of 0.5 bar pressure drop it must be started again.
The reference signal of the regulation has to be given from the terminal
Remark: according to the remote transmitter data, 10 bar corresponds to 100%
Submenu
Setting
1-3
operation mode selection
regulation
1-6-1
source of the regulation ref. signal
terminal
1-6-2
type of the regulation
normal
1-6-3-1
regulation reference signal maximum
80%
1-6-3-2
regulation reference signal minimum
40%
1-6-4-1
regulation reference signal acceleration
30,0s
1-6-5-1
regulation start / stop time limitation
60s
1-6-5-2
regulation start error signal
5%
1-6-5-3
regulation start / stop hysteresis
5 Hz
1-7-1
source of the feedback signal
analogue IN 1.
4-1-1
analogue input 1. type
current
4-1-4-1
analogue input 1. current upper level
20mA
4-1-4-2
analogue input 1. current lower level
4mA
1-2
regulation reference signal
60%
2-6
direction change disable
always
8-1
f maximum
50 Hz
8-2
f minimum
20 Hz
8-3
frequency inhibit limit
55 Hz
1-11-1
PID 1 Ap (proportional gain)
0,5
1-11-2
PID 1 Ti (integration time)
1000ms
1-11-4
PID 1 Ad (diff. element overdriving factor)
0
At simple pressure regulation the most suitable regulation type is "PI" or "I".
The value of Ad is 0.00. By this, the effect of the differentiating elements (Ad, Td ) is switched off.
Setting of the PID parameters depends on the system, they always have to be adjusted to the actual requirements
The start/stop commands can be given out from the terminal blocks, the control reference signal modification from the
terminal.