ABB ACS880 Series Firmware Manual page 299

No. Name/Value
DIO1
DIO2
Other [bit]
40.31 Set 1 deviation
inversion
Not inverted
(Ref - Fbk)
Inverted (Fbk - Ref)
Other [bit]
40.32 Set 1 gain
0.10 ... 100.00
40.33 Set 1 integration
time
0.0 ... 32767.0 s
40.34 Set 1 derivation
time
0.000 ... 10.000 s
Description
Digital input/output DIO1
Digital input/output DIO2
Source selection (see Terms and abbreviations
Inverts the input of the process PID controller.
0 = Deviation not inverted (Deviation = Setpoint - Feedback)
1 = Deviation inverted (Deviation = Feedback - Setpoint)
See also section Sleep function for process PID control
68).
0.
1.
Source selection (see Terms and abbreviations
Defines the gain for the process PID controller. See
parameter 40.33 Set 1 integration time.
Gain for PID controller.
Defines the integration time for the process PID controller.
This time needs to be set to the same order of magnitude as
the reaction time of the process being controlled, otherwise
instability will result.
Error/Controller output
G × I
G × I
Ti
I = controller input (error)
O = controller output
G = gain
Ti = integration time
Note: Setting this value to 0 disables the "I" part, turning the
PID controller into a PD controller.
Integration time.
Defines the derivation time of the process PID controller. The
derivative component at the controller output is calculated on
basis of two consecutive error values (E
to the following formula:
PID DERIV TIME × (E
K
T = 2 ms sample time
S
E = Error = Process reference - process feedback.
Derivation time.
(11.02 DIO delayed status, bit 0).
(11.02 DIO delayed status, bit 1).
O
I
Time
and E
K-1
- E )/T , in which
K-1 S
Parameters 299
Def/FbEq16
10
11
on page 112). -
Not inverted
(Ref - Fbk)
(page
0
1
on page 112). -
1.00
100 = 1
60.0 s
1 = 1 s
0.000 s
) according
K
1000 = 1 s