Preliminary User Manual UMAX023241 - Version: 1.1 25-63
The last two response options, ‘
On When Over Target’
and ‘
On When Under Target’
, are designed
to allow the user to combine the two proportional outputs as a push-pull drive for a system. Both
outputs must be setup to use the same control input (linear response) and feedback signal in order
to get the expected output response. In this mode, the output would be between 0% to 100%.
In Order to allow the output to stabilize, the user can select a non-zero value for 2450h
PID
Tolerance
. If the absolute value of
Error
K
is less than this value,
Error
K
in the formula below will be
set to zero.
The PID algorithm used is shown below, where
G
,
Ki
,
Ti
,
Kd
, and
Td
are configurable parameters.
_
∗
_
∗
_
∗
_
_
∗ /
(
Note: If Ti is zero, I_Gain 0
)
_
∗
/
0.001
Each system will have to be turned for the optimum output response. Response times, overshoots
and other variables will have to be decided by the customer using an appropriate PID tuning strategy.
Axiomatic is not responsible for tuning the control system.
