WEG CFW-11 Series, Programming Manual

Page: 284 / 307

PID Regulator [46]
20-12
20
Description:
It selects the regulator feedback input (process variable).
After choosing the feedback input, the function of the selected input must be programmed at P0231 (for AI1),
P0236 (for AI2), P0241 (for AI3) or P0246 (for AI4).
P0525 – Keypad PID Setpoint
Adjustable
Range: 0.0 to 100.0 % Factory
Setting: 0.0 %
Properties:
Access groups
via HMI:
01 PARAMETER GROUPS
46 PID Regulator
Description:
This parameter allows the setting of the PID Regulator setpoint through the HMI keys, provided that P0221 = 0
or P0222 = 0, and if it is operating in Automatic mode. In case it is operating in Manual mode, the reference via
keypad (HMI) is adjusted at the parameter P0121.
The value of P0525 is kept at the last adjusted value (backup) even disabling or removing power from the inverter
(with P0120 = 1 – Active). In this case, the value of P0525 is recorded on the EEPROM when the condition of
undervoltage on the DC Link is detected.
P0527 – PID Action Type
Adjustable
Range: 0 = Direct
1 = Reverse Factory
Setting: 0
Properties:
Access groups
via HMI:
01 PARAMETER GROUPS
46 PID Regulator
Description:
The type of PID action must be selected as "Direct" when it is necessary that the motor speed be increased so that
the process variable be increased. Otherwise, "Reverse" must be selected.
Table 20.4 - PID action selection
Motor Speed Process Variable Select
Increases
Increases Direct
Diminishes Reverse
That characteristic varies according to the process, but the direct action is more used.
In temperature or level control processes, the setting of the type of action will depend on the configuration. For
instance: at the level control, if the inverter acts on the motor that extracts fluid from the reservoir, the action will be
reverse, because when the level increases, the inverter must increase the motor speed so that it diminishes. In case the
inverter acts on the motor that puts fluid into the reservoir, the action will be direct.