Danfoss VFD500 Series Manual page 102

VFD500 high performance vector control frequency inverter user manual
P40.23
P40.24
P40.25
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
!
P40.26
P40.27
P40.28
0：no switchover
Do not switch, use KP1, TI1, TD1
1：switchover via DI
Switch by DI terminal
KP1, TI1, TD1 are used when DI terminal
No. 41 function is invalid; KP2, TI2, TD2 are
used when valid
PID parameter
2：automatic switchover based on deviation
switchover
condition The absolute value of PID command and
feedback deviation is less than P40.24,
using KP1, TI1, TD1; the absolute value of
deviation is greater than P40.25, using KP2,
TI2, TD2 parameters; the absolute value of
deviation is between P40.24~P40.25, The
two sets of parameters are linearly
transitioned.
PID parameter
switchover
0.0%～P40-25
devation 1
PID parameter
switchover
P40-24～100.0%
devation 2
parameter switching diagram
PID integral
separation
0.0%～100.0%
threshold
PID initial value 0.0%～100.0%
PID intial value
0.00～650.00s
holding time
99
Chapter 5 function code table
☆
0
☆
20.0%
☆
80.0%
☆
100.0%
☆
0.0%
0.00s ☆