User Manual of A90 Series Inverter
201
“7005H (communication setting of process PID feedback)”, and the 7005H data
range is -100.00% to 100.00%, as detailed in Table 0-2.
PID positive and
negative action
selection
The process PID action mode depends jointly on the setting of the function code
F09.04 and the status of the input function “44: PID positive/negative action switching”, as
detailed in Table 7-12.
Table 7-12 Description of PID Positive/Negative Action
44: PID positive/negative
switching
Both the deviation and
output are positive.
The deviation is positive
and the output is negative.
The deviation is positive
and the output is negative.
Both the deviation and
output are positive.
Note: The deviation in PID control is usually “setting - feedback”.
When the feedback signal is greater than the PID setting, the output frequency
of the inverter should decrease for PID balance. Take the water supply
control as an example. When the pressure increases, the pressure feedback
will increase. The output frequency of the inverter must be decreased to
reduce the pressure and keep the constant pressure. In this case, the PID
should be set to the positive action.
When the feedback signal is greater than the PID setting, the output frequency
of the inverter needs to increase for PID balance. Take temperature control as
an example. The PID regulator needs to be set to negative action to control
the temperature.
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