5
DETAILED PARAMETER DESCRIPTION
1. For direct action, the time must be measured with maximum input flow and minimum output flow.
2. For reverse action, the time must be measured with minimum input flow and maximum output flow.
An equation to calculate an initial value for P0521 (PID integral gain) as a function of the system response time, is
presented below:
P0521 =
0.02
t
t = time (seconds)
✓
NOTE!
This parameter is only visible on the HMI when: the PID function is active, P0203 = 1 (PID regulator).
P0524 - PID feedback selection
Adjustable range: 0 to 1 Factory setting: 0
Acesso: Menu → Configurations → Functions → PID
Description:
It selects the regulator feedback (Process Variable) input.
After the feedback input has been chosen, the function of the selected input must be programmed at P0237
(for AI2) or P0241 (for AI3).
Feedback type:
– The PID action type described above considers that the process variable feedback signal increases when
the process variable also increases (direct feedback). This is the most used feedback type.
– If the process variable feedback decreases as the process variable increases (inverse feedback), then it
is necessary to program the analog input selected for the PID feedback (AI2 or AI3) as inverse reference:
P0239 = 2 (10 to 0 V/20 to 0 mA) or 3 (20 to 4 mA) for AI2 feedback and P0243 = 2 (10 to 0 V/20 to 0 mA)
or 3 (20 to 4 mA) for AI3 feedback. Without this setting, the PID does not operate correctly.
Table 5.61: PID feedback selection
P0524
Function
0
P0237 - AI2 signal function
1
P0241 - AI3 signal function
✓
NOTE!
This parameter is only visible on the HMI when: the PID function is active, P0203 = 1 (PID
regulator).
This parameter can be changed only with the motor stopped.
P0525 - PID regulator setpoint
Adjustable range: 0.0 to 100.0 % Factory setting: 0.0 %
Acesso: Menu → Configurations → Functions → PID
MVW3000 | 5-86
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