Danfoss VLT HVAC Drive FC 131 Programming Manual page 156

VLT® HVAC Drive FC 131
Programming Guide
Enter the motor speed to be attained as a start signal for commencement of PI control. After power-up, the drive operates using
speed open-loop control. When the process PI start speed is reached, the drive changes to PI control.
Table 365: Range:
Min: 0 Hz
20-84 On Reference Bandwidth
Default value: 5%
Conversion index: 0
Enter the On Reference bandwidth. When the PI Control Error (the difference between the reference and the feedback) is greater
than the value of this parameter, then the On Reference status bit is set high (1).
Table 366: Range:
Min: 0%
4.15.5 20-9* PI Controller
Parameters for configuring the Process PI controller.
20-91 PI Anti Windup
Default value: [1] On
Conversion index: -
Table 367: Option:
[0] Off Continue regulation of an error even when the output frequency cannot be increased or decreased.
[1] On Cease regulation of an error when the output frequency can no longer be adjusted.
20-93 PI Proportional Gain
Default value: 0.50
Conversion index: -2
Enter the process controller proportional gain. Quick control is obtained at high amplification. However, if amplification is too high,
the process may become unstable.
Table 368: Range:
Min: 0
20-94 PI Integral Time
Default value: 20 s
Conversion index: -2
Enter the process controller integral time. Obtain quick control through a short integral time, though if the integral time is too short,
the process becomes unstable. An excessively long integral time disables the integral action.
Table 369: Range:
Min: 0.10 s
20-97 PI Feed Forward Factor
Default value: 0%
Conversion index: 0
156 | Danfoss A/S © 2022.05
Max: 200.0 Hz
Parameter type: Range
Data type: u_int8
Max: 200%
Parameter type: Option
Data type: u_int8
Parameter type: Range
Data type: u_int16
Max: 10
Parameter type: Range
Data type: u_int32
Max: 9999 s
Parameter type: Range
Data type: u_int16
Default value: 0 Hz
2-setup: All setups
Change during operation: True
Default value: 5%
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
Default value: 0.50
2-setup: All setups
Change during operation: True
Default value: 20 s
2-setup: All setups
Change during operation: True
Parameters
AU370727746889en-000101 / 130R0994