Danfoss VLT Flow Drive FC 111 User Manual

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1-72 Start Function
Default value: [2] Coast/delay time
Parameter type: Option
2-setup: All setups
Conversion index: -
Data type: u_int8
Change during operation: True
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
The motor is energized with parameter 2-00 DC Hold/Motor Preheat Current during start delay time.
[2]
Coast/delay time
A temperature-dependent resistor is coasted during start delay time (drive off).
1-73 Flying Start
Default value: -
Parameter type: Option
2-setup: All setups
Conversion index: -
Data type: u_int8
Change during operation: True
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
Disable the function.
[1]
Enabled
Enable the function.
4.3.9 1-8* Stop Adjustments
Parameters for configuring special motor stop features.
1-80 Function at Stop
Default value: [0] Coast
Parameter type: Option
2-setup: All setups
Conversion index: -
Data type: u_int8
Change during operation: True
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
Leave the motor in free mode.
[1]
DC hold / Motor Preheat
Energize the motor with a DC hold current (see parameter 2-00 DC Hold/Motor Preheat Current).
1-82 Min Speed for Function at Stop [Hz]
Default value: 0 Hz
Parameter type: Range
2-setup: All setups
Conversion index: -1
Data type: u_int16
Change during operation: True
Set the output frequency at which to activate parameter 1-80 Function at Stop.
AU363928304090en-000101 / 130R0982 | 55Danfoss A/S © 2021.07
Parameters
VLT® Flow Drive FC 111
Programming Guide

Danfoss VLT Flow Drive FC 111 Specifications

General

Brand	Danfoss
Model	VLT Flow Drive FC 111
Category	DC Drives
Language	English