WEG CFW501 V1.8X, Programming Manual, Page: 179 / 192

HVAC Functions
CFW501 | 18-21
18
P1062 – Process Variable of the External PID Controller
Adjustable
Range:
-32768 to 32767 Factory
Setting:
Properties: ro
Access groups
via HMI:
HVAC
Description:
This parameter shows the actual value of the process variable of the main PID controller in engineering unit.
NOTE!
This parameter is displayed as the selection in the indirect engineering unit 2 parameters (P0512
and P0513).
P1063 – External PID Controller Output
Adjustable
Range:
0.0 to 100.0 % Factory
Setting:
Properties: ro
Access groups
via HMI:
HVAC
Description:
This parameter indicates the actual value of External PID controller output.
P1064 – External PID Controller Action Control
Adjustable
Range:
0 = Disable PID
1 = Direct Mode
2 = Reverse Mode
Factory
Setting:
0
Properties:
cfg
Access groups
via HMI:
HVAC
Description:
This parameter defines how the action control or regulation of External PID controller.
Table 18.8: Description of External PID controller action control
P1064 Description
0 It defines the External PID controller 1 will be disabled to operation.
1 It defines the External PID controller 1 action control or regulation will be enabled in direct mode.
2 It defines the External PID controller 1 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 external PID controller must be set to direct mode. E.g.: Valve
installed in a tank water input. For the level of the tank (process variable) to increase, it is necessary that the
flow increase, which is accomplished by opening the valve. 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 external PID controller must be set to reverse mode. E.g.: Valve installed in a tank water output. For the
level of the tank (process variable) to increase, it is necessary that the flow decrease, which is accomplished
by closing the valve.