WEG MVW3000 - Page 163

5
DETAILED PARAMETER DESCRIPTION
Description:
It provides the setpoint that is adjusted via the and keys for the PID regulator (P0203 = 1 or 3),
provided that P0221 = 0 (Local) or P0222 = 0 (Remote) and in automatic mode. If the PID is in manual mode,
then the reference by keys is given by P0121.
When the PID regulator is operating in automatic mode, the setpoint is via reference adjusted with P0221
(Local) or P0222 (Remote). Most PID applications either use setpoint via analog input AI1 [P0221 = 1 (Local)
or P0222 = 1 (Remote) ou via and keys [P0221 = 0 (Local) or P0222 = 0 (Remote).
Refer to section 6.1 PID REGULATOR on page 6-1 .
✓
NOTE!
This parameter is only visible on the HMI when: the PID function is active, P0203 = 1 (PID regulator).
P0526 - Process variable filter
Adjustable range: 0.0 to 16.0 s Factory setting: 0.1 s
Acesso: Menu → Configurations → Functions → PID
Description:
It adjusts time constant of the process variable filter.
The 0.1 s value is usually adequate, unless the process variable presents much noise. In such case, increase
the value gradually, observing the result.
✓
NOTE!
This parameter is only visible on the HMI when: the PID function is active, P0203 = 1 (PID regulator).
P0527 - Error Value Inv
Adjustable range: 0 to 1 Factory setting: 0
Acesso: Menu → Configurations → Functions → PID
Description:
It defines the type of control action.
Select according to the process.
Table 5.62: Selection of operation
Motor speed
Process
variable
Select
Increases Direct
Increases
Decreases Reverse
Process necessity:
– PID action type: the PID action must be selected as “Direct” when it is necessary to increase the motor
speed in order to increase the process variable. Otherwise, select “Reverse”.
Example 1 - Direct: The inverter drives a pump responsible for filling a reservoir using the PID to control
the level. For the level (process variable) to increase, it is necessary that the flow, and consequently the
motor speed, also increases.
Example 2 - Reverse: The inverter drives a fan responsible for cooling a cooling tower using the PID to
control the temperature. In order to increase the temperature (process variable), it is necessary to decrease
the ventilation by decreasing the motor speed.
MVW3000 | 5-87