Veikong VFD500 Series User Manual page 111

Chapter 5 Function code
In some applications, one group PID parameter is not enough, different PID parameters would be adopted
according to the situation.
The function codes are used to switch two groups PID parameter. The setting mode of the regulator
parameters P40.20~P40.22 is similar as P40.17~P40.19's.
Two groups PID parameter can be switched via DI terminal, or switched according to PID deviation
automatically.
When selection is automatic switching: when the deviation absolute value between given and feedback is
smaller than P40.24 (PID parameter switching deviation 1), PID parameter selection is group 1. When the
deviation absolute value between given and feedback is bigger than P40.25 (PID parameter switching
deviation 2), PID parameter selection is group 2. When the deviation absolute value between given and
feedback is between P40.24 and P40.25, PID parameter is the linear interpolation of two groups PID
parameter, showed as below
Function
Parameter name
code
PID integral
P40.26
separation threshold
P40.27 PID initial value
PID initial value
P40.28
holding time
This function is only valid when P40.39 = 0 which is not calculated. The PID output is reset after the inverter stops.
If P40.28 ≠ 0, when the inverter runs, the PID output is equal to the initial value of PID and keeps the time of
VFD500 high performance vector control frequency inverter user manual
parameter switching diagram
Description
0.0%～100.0%
0.0%～100.0%
0.00～650.00s
P40.28.
PID initial value function diagram
- 109-
Default Property
100.0%
☆
0.0%
☆
0.00s
☆