WEG CFW501 V1.8X Programming Manual page 168

HVAC Functions
P1017 – Main PID Controller Action Control
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
This parameter defines how the action control or regulation of Main PID controller.
P1017
0 It defines the Main PID controller will be disabled to operation.
1 It defines the Main PID controller action control or regulation will be enabled in direct mode.
2 It defines the Main PID controller action control or regulation will be enabled in reverse mode.
NOTE!
In situations that, in order to increase the value of the process variable, it is necessary to increase
the output of the PID controller, the control action of the PID controller must be set to direct mode.
E.g.: Pump driven by an inverter and filling a tank. For the level of the tank (process variable) to increase,
it is necessary that the flow increase, which is accomplished by increasing the speed of the motor. In
situations that, in order to increase the value of the process variable, it is necessary to decrease the
output of the PID controller, the control action of the PID controller must be set to reverse mode. E.g.:
Fan driven by the inverter cooling down a cooling tower. When an increase in temperature is desired
(process variable), it is necessary to reduce the ventilation by reducing the motor speed.
18
18-10 | CFW501
0 = Disable PID
1 = Direct Mode
2 = Reverse Mode
cfg
HVAC
Table 18.4: Description of Main PID controller action control
Description
Factory 0
Setting: