WEG CFW-11 Programming Manual page 277

Example:
- Full scale of the transducer (maximum output value) = 25 bar (FS = 25);
- Operation range (range of interest) = 0 to 15 bar (OR = 15).
Opting to maintain P0237 = 1.000 and P0239 = 0 (factory setting), which is the most common for most
of the applications:
- P0525 = 50 % (Keypad PID setpoint) will be equivalent to the used sensor full scale value, i.e., 0.5 x FS = 12.5
bar. Thus, the operation range (0 to 15 bar) represents 60 % of the setpoint.
If it is necessary to adjust P0237:
- Considering a gap of 10 % for the process variable measurement range (MR = 1.1 x OR = 16.5), it must
be adjusted at 0 to 16.5 bar. Therefore, the parameter P0237 must be set:
FS 25
P0237 = = = 1.52
MR 16.5
Thus, a setpoint of 100 % represents 16.5 bar, i.e., the operation range in percentage stays from 0 to 90.9 %
(OR = 15/16.5).
If offset adjustment is necessary, the parameter P0239 must be configured according to the detailed description
of the Item 13.1.1 Analog Inputs [38] on page
If it is wished to change the indication of the process variable on the keypad (HMI), the parameters P0528 and
P0529 must be adjusted according to the transducer full scale and to the defined P0237 value (Refer to the
description of those parameters at the
P0532 can be configured to set the process variable engineering unit.
Example: If a reading of "25.0 bar" is wished for the motor maximum speed, set:
– P0528 = 250.
– P0529 = 1 (wxy.z).
– P0530 = "b".
– P0531 = "a".
– P0532 = "r".
5) To set the reference (setpoint): to define the operation mode (local/remote) at the parameter P0220 and
the reference source at parameters P0221 and P0222, according to the desired situation.
In case the setpoint is defined via keypad (HMI), set P0525 according to the equation below:
Desired value (process variable)
Setpoint (%) =
Sensor full scale value
13-1.
Section 20.6 PARAMETERS on page
AIx feedback
x
gain
PID Regulator [46]
20-9). The parameters P0530 to
x 100 %
20
20-5