Shihlin electric SL3 Series, User Manual

Page: 135 / 211

PID parameter group 08
PARAMETER DESCRIPTION 131
5.9.1 PID function selection

Inverter can control flow, volume or pressure by PID control. By using analog signal or parameter setting as target
source, and with analog signal as feedback source, it forms a closed loop control system.
Parameter Name Default Setting Range Content
08-00
P.170
PID function selection 0
0 Off
2
Target depends on 08-03(P.225),feedback depends on 3-5
terminal current/input voltage
08-01
P.171 PID feedback control
method
0
0 Negative feedback control
1 Positive feedback control
PID function selection

During PID control, frequency displayed on screen is inverter output frequency.

For terminal 3-5 input signal filtering please refer to parameters 02-10(P.60).
5.9.2 PID parameter group

By setting PID parameters users can realize automatic adjustment of process control
Parameter Name Default Setting Range Content
08-03
P.225 PID target value from
keypad
20.0% 0~08-43(P.251)
When 08-00 (P.170) is set to 2, the target value is set by
08-03(P.225)
08-04
P.172
Proportional gain 20 1~100
This gain determines the proportion controller’s response on
feedback deviation. The greater the gain, the faster the
response. Gain set too high will cause vibration.
08-05
P.173
Integral time 1.0s 0～100.0s
This parameter determines integral controller’s integral time.
When integral gain is too high, integral effect will be too weak
to eliminate steady state deviation. When integral gain is
rather small, the system vibration time will increase, and too
small integral gain will cause system unstable.
08-06
P.174
Differential time
0ms
0～1000ms
This gain determines deviation controller’s response to
deviation change rate. Appropriate deviation time can reduce
overshooting and vibrating between proportion controller and
integral controller. Deviation time set too long will cause
system vibration.
08-07
P.175
Abnormal deviation 0.0% 0～100.0% ---
08-08
P.176 Abnormal duration
time
30.0s 0～600.0s ---
08-09
P.177 Abnormal processing
mode
0
0 Stop freely
1 Slow down to stop
2 Alarm and continue operation
08-10
P.178 Sleep detection
deviation
0.0% 0～100.0% ---
Setting