Shihlin SA3 Series, User Manual

Page: 235 / 423

PID parameter group 08
PARAMETER DESCRIPTION 233
5.9.9 PID parameter switch-over

If one group of PID parameters cannot meet the requirements of the whole process control, two groups of PID can
effectively solve the problem.
Parameter Name Default Setting Range Content
08-33
P.720
PID parameter
switch-over operation
selection
0
0 Off
1 Switch PID according to deviation
08-34
P.721
PID parameter
switch-over deviation
lower limit
20.00% 0～100.00%
If deviation is less than 08-34 (P.721), the first group of PID
parameters will work.
If deviation is greater than 08-35 (P.722), the second group
of PID parameters will work.
If deviation is between the above two, PID parameters will
change linearly.
08-35
P.722
PID parameter
switch-over deviation
upper limit
80.00% 0～100.00%
PID parameter switch-over

In some applications, a group of PID parameters cannot meet the requirements of the whole operation process, so
different PID parameters need to be adopted in different situations. Two groups of PID parameters can be
automatically switched according to the PID deviation, as shown in the following diagram:
PID deviation
absolute value
PID parameters
08-34
(P.721)
08-35
(P.722)
Group 1 of PID parameters
08-25(P.712)
、
08-26(P.713)
、
08-27(P.714)
Group 2 of PID parameters
08-20(P.641)
、
08-21(P.642)
、
08-22(P.643)
5.9.10 PID action when error occurs

When PID encounter sensor disconnect or inverter stop, 08-39(
P.726
) and 08-40(
P.727
) will show different action to
apply to different applications.
Parameter Name Default Setting Range Content
08-36
P.723 PID disconnection
operation option
1 0 ~ 1
0: Select no need to run to the upper limit when PID is
disconnected
1: Select need to run to the upper limit when PID is
disconnected
08-39
P.726
PID counting when
inverter stop action
selection
0
0
PID stop counting when
inverter stop
Set PID action when inverter
stop
1
PID stop counting when
inverter stop
PID action when error occurs

08-36(P.723) is used to set PID signal loss action. Once detected PID signal loss, inverter will output alarm.

08-39(P.726) is used to set PID action when inverter stops. Normally PID stops when inverter stops.
Setting
Setting