ABB ACQ80, Firmware Manual

Page: 195 / 390

Parameters 195
40.32 Set 1 gain
Defines the gain for the process PID controller.
See parameter
40.33 Set 1 integration time
.
1.00
0.01…100.00 Gain for PID controller. 100 = 1
40.33 Set 1 integration
time
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.
Note: Setting this value to 0 disables the “I” part,
turning the PID controller into a PD controller.
60.0 s
0.0…9999.0 s Integration time. 1 = 1 s
40.34 Set 1 derivation
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
K-1
and E
K
) according
to the following formula:
PID DERIV TIME × (E
K
- E
K-1
)/
T
S
, in which
T
S
= 2 ms sample time
E = Error = Process reference - process feedback.
0.000 s
0.000…10.000 s Derivation time. 1000 = 1 s
No. Name/Value Description Def/
FbEq16
Ti
O
I
G × I
G × I
I = controller input (error)
O = controller output
G = gain
Ti = integration time
Time
Error/Controller output