Chapter 5 Function parameter
111
Ch
ap
ter 5
run, it is required to use different PID parameters under different conditions.
This group of function codes is used to switch between two groups of PID parameters. Which
the setting method for regulator parameter(E2.16 to E2.18) is similar to the parameter(E2.13 to
E2.15).The two groups of PID parameters can be switched by the multi-functional digital DI
terminal, can also be switched automatically according to the PID deviation.If you select the multi-
functional DI terminal, the multi-function terminal function selection shall be set to 43 (PID
parameter switching terminal), select parameter group 1 (E2.13 E2.15) when the terminal is
inactive, otherwise select parameter group 2 (E2.16 to E2.18).
If you select the automatic switch mode, and when the absolute value of deviation between
reference and feedback parameters is less than PID parameter switching deviation 1(E2.20), select
parameter group 1 for PID parameter. When the absolute value of deviation between reference and
feedback parameters is more than PID parameter switching deviation 2(E2.21), select parameter
group 2 for PID parameter. If the deviation between reference and feedback parameters is between
switching deviation 1 and switching deviation 2, PID parameter is the linear interpolation of the
two groups of PID parameters , as shown in the figure.
PID parameter 1
E2.13、E2.14、E2.15
PID deviation
PID parameter
E2.20
E2.21
PID parameter 2
E2.16、E2.17、E2.18
Diagram 5-33:PID parameter switch
E2.22 PID integral properties
Units digit
integral separation
00
☆
Invalid
0
Valid
1
Tens digit
whether stop integration when
output reaches limit
continue
0
stop integral
1
Integral separation:If the integral separation is set to active, when the integral pause of
multifunction digital DI(function 38) is active, PID integral will stop operations, at the time only
the proportional and derivative actions of PID is active.If the integral separation is set to inactive,
however the multifunction digital DI is active or inactive, the integral separation will be inactive.
Whether stop integration when output reaches limit: you can select whether or not to stop the
integral action after PID operation output reaches the maximum or the minimum value.If you
select to stop the integral action, the PID integral will stop the calculation, which may help to
reduce the overshoot of PID.
E2.23 PID initial value
0.0%~100.0%( Max frequency)
0.0%
☆
E2.24 PID initial value hold time
0.00s~360.00s
0.00s
☆
When the inverter starts, PID output is fixed at PID initial value(E2.23), and then continuous
for the PID initial value hold time(E2.24), at last PID begins operation of the closed-loop
adjustment.
