Danfoss VLT HVAC Drive FC 131 Programming Manual page 56

VLT® HVAC Drive FC 131
Programming Guide
Table 74: Range:
Min: 0%
1-65 Resonance Dampening Time Constant
Default value: 0.005 s
Conversion index: -3
Set parameter 1-64 Resonance Dampening and parameter 1-65 Resonance Dampening Time Constant to help eliminate high-frequen-
cy resonance problems. Enter the time constant that provides the best dampening.
Table 75: Range:
Min: 0.001 s
1-66 Min. Current at Low Speed
Default value: 50%
Conversion index: -
Applies to PM motors only. Increasing the minimum current improves motor torque at low speed, but also reduces efficiency.
Table 76: Range:
Min: 0%
4.3.8 1-7* Start Adjustments
Parameters for setting special motor start features.
1-70 Start Mode
Default value: [1] Parking
Conversion index: -
Use this parameter to select the PM motor start mode which is to initialize the VVC+ control core for previously free running PM
motors. This parameter is active for PM motors in VVC+ mode only if the motor is stopped (or running at low speed).
Table 77: Option:
[0] Rotor De- The rotor detection function estimates the electrical angle of the rotor and uses the angle as a starting point.
tection This option is the standard selection for automation drive applications. If the flying start function detects that
the motor is running at low speed or is stopped, the drive can detect the rotor position (the angle). The drive
then starts the motor from that angle.
[1] Parking The parking function applies DC current across the stator winding and rotates the rotor to electrical zero posi-
tion. This function is typically selected for HVAC applications. If the flying start function detects that motor is
running at low speed or is stopped, the drive sends out a DC current to park the motor at an angle. The drive
then starts the motor from that angle.
[3] Rotor Rotor last position takes the advantage of the last position of rotor at stop to give a very quick start. It records
Last Posi- the last position of rotor at stop, DC brake cut in speed function can be used to ensure the rotor is accurate and
tion stably stopping at the last position. For start just after power-up and coast, flystart or rotor detection must be
performed according to the rotor speed.
1-71 Start Delay
Default value: 0 s
Conversion index: -1
This parameter enables a delay of the starting time. The drive begins with the start function selected in parameter 1-72 Start Func-
tion. Set the start delay time until acceleration is to begin.
56 | Danfoss A/S © 2022.05
Max: 500%
Parameter type: Range
Data type: u_int16
Max: 0.050 s
Parameter type: Range
Data type: u_int16
Max: 120%
Parameter type: Option
Data type: u_int8
Parameter type: Range
Data type: u_int8
Default value: 100%
2-setup: All setups
Change during operation: True
Default value: 0.005 s
2-setup: All setups
Change during operation: True
Default value: 50%
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
AU370727746889en-000101 / 130R0994
Parameters