Danfoss VLT Flow Drive FC 111 - Page 54

1-65 Resonance Dampening Time Constant
Default value: 0.005 s
Parameter type: Range
2-setup: All setups
Conversion index: -3
Data type: u_int16
Change during operation: True
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 76: Range:
Min: 0.001 s
Max: 0.050 s
Default value: 0.005 s
1-66 Min. Current at Low Speed
Default value: 50%
Parameter type: Range
2-setup: All setups
Conversion index: -
Data type: u_int16
Change during operation: True
Applies to PM motors only. Increasing the minimum current improves motor torque at low speed, but also reduces efficiency.
Table 77: Range:
Min: 0%
Max: 120%
Default value: 50%
4.3.8 1-7* Start Adjustments
Parameters for setting special motor start features.
1-70 Start Mode
Default value: [1] Parking
Parameter type: Option
2-setup: All setups
Conversion index: -
Data type: u_int8
Change during operation: True
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 78: Option:
[0]
Rotor De-
tection
The rotor detection function estimates the electrical angle of the rotor and uses the angle as a starting point.
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
Last Posi-
tion
Rotor last position takes the advantage of the last position of rotor at stop to give a very quick start. It records
the last position of rotor at stop, DC brake cut in speed function can be used to ensure the rotor is accurate and
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
Parameter type: Range
2-setup: All setups
Conversion index: -1
Data type: u_int8
Change during operation: True
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.
Table 79: Range:
Min: 0 s
Max: 25.5 s
Default value: 0 s
AU363928304090en-000101 / 130R098254 | Danfoss A/S © 2021.07
Parameters
VLT® Flow Drive FC 111
Programming Guide