Danfoss VLT Flow Drive FC 111 Programming Manual page 55

VLT® Flow Drive FC 111
Programming Guide
1-72 Start Function
Default value: [2] Coast/delay time
Conversion index: -
Select the start function during start delay when a non-zero value is set in parameter 1-71 Start Delay.
Table 80: Option:
[0] DC Hold/delay time
[2] Coast/delay time
1-73 Flying Start
Default value: -
Conversion index: -
This function makes it possible to catch a motor that is spinning freely due to a mains drop-out. Flying start searches in clockwise
direction only. If not successful, a DC brake is activated. If PM-enabled options are selected, parking is carried out if the speed is
below 2.5–5% of nominal speed, in the time set in parameter 2-07 Parking Time.
If the speed estimate comes out below 2.5–5% of nominal speed, the parking function is engaged (see parameter 2-06 Parking Cur-
rent and parameter 2-07 Parking Time). Otherwise, the drive catches the motor at that speed and resumes normal operation.
The flying start function used for PM motors is based on an initial speed estimation. The speed is always estimated as the 1st thing
after an active start signal is given.
Current limitations of the flying start principle used for PM motors:
• The speed range is up to 100% nominal speed or the field weakening speed (whichever is lowest).
• For high inertia applications (that is, where the load inertia is more than 30 times larger than the motor inertia).
Table 81: Option:
[0] Disabled
[1] Enabled
4.3.9 1-8* Stop Adjustments
Parameters for configuring special motor stop features.
1-80 Function at Stop
Default value: [0] Coast
Conversion index: -
Select this function after a stop command or after the speed is ramped down to the settings in parameter 1-82 Min Speed for Func-
tion at Stop [Hz].
Table 82: Option:
[0] Coast
[1] DC hold / Motor Preheat
1-82 Min Speed for Function at Stop [Hz]
Default value: 0 Hz
Conversion index: -1
Set the output frequency at which to activate parameter 1-80 Function at Stop.
Danfoss A/S © 2021.07
Parameter type: Option
Data type: u_int8
The motor is energized with parameter 2-00 DC Hold/Motor Preheat Current during start delay time.
A temperature-dependent resistor is coasted during start delay time (drive off).
Parameter type: Option
Data type: u_int8
Disable the function.
Enable the function.
Parameter type: Option
Data type: u_int8
Leave the motor in free mode.
Energize the motor with a DC hold current (see parameter 2-00 DC Hold/Motor Preheat Current).
Parameter type: Range
Data type: u_int16
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
2-setup: All setups
Change during operation: True
AU363928304090en-000101 / 130R0982 | 55
Parameters