Delta DVP-ES2 - Manual (Page 368)

D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
3-252
Application 2:
Speed control system and pressure control system work individually (use diagram of Example 2)
Control purpose:
After the speed control operates in open loop for a period of time, adding pressure control
system (PID instruction) to perform a close loop control.
Control properties:
Since the speed and pressure control systems are not interrelated, we have to structure an
open loop for speed control first following by a close loop pressure control. If users afraid that
the pressure control system changes excessively, consider adding the SC ramp-up function
illustrated in Application 1 into this control. See the control diagram below.
D40
0
255
0rpm
3000rpm
D30
D32 D1116
D31
+
+
M3 M2=ON
PID
PV
MV D5
D1
SV
D0
D1110
M0=ON
M1=ON
SV of
speed
speed
convert
to
voltage
AC
drive
MV
convert to
accel/decel
SV of
pressure
SV
ramp-up
(optional)
pressure
meter
Part of the example program:
M1
MOV K0 D5
M3
MOV D40 D30
M2
MOV K3000 D32 K3000 D32 >
MOV K0 D32 K0 D32 <
ADD D30 D31 D32
MOV D32 D1116
M1
PID D1 D1110 D10 D5
M1002
MOV K1000 D40
M0
MOV D0 D1
DIV D32 K11 D32
MOV K255 D32 K255 D32 >