WEG CFW501 V1.8X, Programming Manual, Page: 183 / 192

HVAC Functions
CFW501 | 18-25
18
P1074 – Maximum Level for Process Variable of the External PID Controller
Adjustable
Range:
-32768 to 32767
Factory
Setting:
1000
Properties:
Access groups
via HMI:
HVAC
Description:
This parameter defines the maximum value of the analog input sensor configured for feedback of the external
PID controller according to its engineering unit.
NOTE!
This parameter will be viewed according to the selection of the parameters for the engineering unit
2 (P0512 and P0513).
Through the minimum and maximum sensor levels of the process variable and the value of analog input Aix, we
obtain the equation of the curve to convert the process variable of the external PID controller:
P1062 [(P1074 - P1073) x (AIX)] + P1073
Where:
P1062 = Process Variable of the External PID Controller;
P1073 = Minimum Level for Process Variable of the External PID Controller;
P1074 = Maximum Level for Process Variable of the External PID Controller;
AIX = Value of the Analog Input AI1 or AI2.
P1075 – Configuration of the Alarms for Process Variables of the External PID
Controller
Adjustable
Range:
0 = Disable
1 = Enable Alarm
2 = Enable Fault
Factory
Setting:
0
Properties:
Access groups
via HMI:
HVAC
Description:
This parameter defines how the low level and high level alarm conditions will be handled for the process variable
of the external PID controller.
Table 18.10: Configuration of the alarms for the external PID controller
P1075 Description
0 It defines that the alarms for low level and high level of the process variable of the external PID controller will be disabled.
1
It defines the alarms for low level and high level of the process variable of the external PID controller will be enabled
and just the message of the respective alarm will be generated, while the external PID controller remains active and
controlling the motor driven by the CFW501 frequency inverter.
2
It defines that the alarms for low level and high level of the process variable of the external PID controller will be
enabled and a fault will be generated on the CFW501 frequency inverter. The message of the respective alarm will be
generated during the motor deceleration and the respective fault after the shutdown of the motor.