Appendix V
172
A
p
p
en
d
ix
V
V-11. Air compressor constant pressure control (sensor for
two-wire pressure transmitter)
V-11-1 electrical diagram:
+
-
P
380/400V50/60Hz
Three phase input power supply
Circuit breaker
Motor
M
%
FWD/STOP
REV/STOP
Constant pressure control of air compressor
Two wire pressure sensor
4
~
20mAfeedback
Air compressor
ST500
V-11-2 Connection:
Short circuit between COM and GND;
+ 24V, AI1 indirect pressure sensor feedback 4 ~ 20mA current signal;
DI1, COM indirect "forward / stop" signal, DI2, COM connected to "fault reset" signal;
AI1 jumper cap shorted to I end.
V-11-3 Parameter setting
No.
Code
Parameter name
Setting range
F0.03 Frequency source master setting
PID control setting
8
F0.11 Command source selection
Terminal block control (LED on)
1
F0.13 Acceleration time 1
0.0s ~ 6500s
50.0s
F0.14 Deceleration time 1
0.0s ~ 6500s
50.0s
F0.18 Carrier Frequency
0.5kHz ~ 16.0 kHz
4.0 kHz
F0.21 Upper limit frequency
0.00 ~ maximum frequency
(F0.19)
48.00Hz
F0.23 Upper limit frequency offset
0.00 ~ Upper limit frequency
(F0.21)
25.00Hz
F1.00 DI1 terminal function selection
Forward run (FWD)
1
F1.01 DI2 terminal function selection
Fault reset
9
F1.12 Minimum input for AI1
0.5V corresponds to 1mA
2.00V
F3.07 Stop mode
Free stop
1
E2.01 PID keyboard reference
0.0%-100.0%
Set the desired
pressure value
percentage based
on the pressure
value actually
required
E2.29
PID automatic deceleration
frequency option
valid
1
E2.27
Computing status after
PID stop
PID stop with computing
1
