Goodrive300-21 integrated machine for air compressor
Function description
-
63
-
H: Restart delay stage after stop, the duration time is P18.16
In automatic loading/unloading mode, when air compressor control is valid and air supply of the
compressor becomes normal after it starts, if exhaust pressure is detected to be above P18.05,
automatic unloading will be applied.
If sleep function is valid, the inverter will enter sleep state. While if sleep function is invalid, the
inverter will run continuously at no-load frequency P18.12. When exhaust pressure is detected to be
below P18.06, automatic loading will be applied. During loading operation, the rotation speed of the
master is controlled by pressure PID. P18.07 is the air supply pressure when setting stable running of
air compressor, the inverter keeps exhaust pressure constant by regulating the rotation speed of the
master. Constant pressure control adopts PID algorithm, and the frequency reference source of the
master is set by P00.06=7, the reference source of PID is P09.00=10, the reference pressure is set
by P18.07. The feedback source of PID is P09.02=8, which is gained by detecting pressure signal.
P9.04, P9.05 and P9.06 adopts system default values.
Note:
In above figure, the stop mode of the inverter is operated by P01.08, the default setting is
decelerating to stop. The inverter is in deceleration process under normal stop command and
unloading stage; it changes to coast to stop mode when emergency stop or fault occur.
5.3 PID commissioning
PID control, a common mode for process control, is mainly used to adjust the inverter output
frequency or output voltage by performing scale-division, integral and differential operations on the
difference between feedback signal of controlled variables and signal of the target, thus forming a
negative feedback system to keep the controlled variables above the target. It is applicable to flow
control, pressure control, temperature control, and so on. The following is the basic schematic block
diagram for output frequency regulation.
+
Reference-
feedback<P09.08
？
P09.10
(lower limit value of PID
output)
P09.09
（
upper limit value of PID
output
）
0
1
P09.03
(PID output characteristics)
PID output
P17.00
P17.23
P09.08 (Limit of PID control
deviation)
P09.02
(PID feedback source)
P09.00
(PID reference source)
P17.24
PID feedback
value
PID reference
value
Set frequency
0
1
2
3
4
5
6
7
8
9
Keypad
AI1
PROFIBUS\CANopen
MODBUS
Multi-step
speed
HDIA
AI3
AI2
Ethernet
HDIB
0
1
2
3
4
5
6
7
AI1
PROFIBUS\CANopen
MODBUS
HDIA
AI3
AI2
Ethernet
Y
N
PID stops
adjustment
Pre-set PID reference of
keypad
Keep current frequency
Terminal function 25
PID control pause
Valid
Invalid
Kp P09.04 (proportional gain)
Ti P09.05 (integral time)
Td P09.06 (differential time)
P09.01
EtherCat/Profinet
PLC card
10
11
HDIB
EtherCat/Profinet
PLC card
8
9
10
