Danfoss VLT HVAC Series User Manual

3.3.6 1-7* Start Adjustments
Parameters for setting special motor start features.
1-71 Start Delay
Range: Function:
0.0 s* [0.0 - 120.0 s] The function selected in par.1-80 Function at Stop is active in the delay period.
Enter the time delay required before commencing acceleration.
1-73 Flying Start
Option: Function:
This function makes it possible to catch a motor that is spinning freely due to a line drop-out.
When par.1-73
Flying Start is enabled, par.1-71 Start Delay has no function.
Search direction for flying start is linked to the setting in par.4-10
Motor Speed Direction .
Clockwise [0]: Flying start search in clockwise direction. If not successful, a DC brake is carried out.
Both Directions [2]: The flying start will first make a search in the direction determined by the last
reference (direction). If unable to find the speed, it will search in the other direction. If not suc-
cessful, a DC brake will be activated in the time set in par.2-02
DC Braking Time . Start will then take
place from 0 Hz.
[0] * Disabled Select
Disable [0] if this function is not required
[1] Enabled Select
Enable [1] to enable the adjustable frequency drive to “catch” and control a spinning motor.
3.3.7 1-8* Stop Adjustments
Parameters for setting special stop features for the motor.
1-80 Function at Stop
Option: Function:
Select the adjustable frequency drive function after a stop command or after the speed is ramped
down to the settings in par.1-81
Min Speed for Function at Stop [RPM] .
[0] * Coast Leaves motor in free mode.
[1] DC Hold/Motor Preheat Energizes motor with a DC holding current (see par.2-00
DC Hold/Preheat Current ).
1-81 Min Speed for Function at Stop [RPM]
Range: Function:
3. RPM* [0 - 600 RPM] Set the speed at which to activate par.1-80 Function at Stop .
1-82 Min Speed for Function at Stop [Hz]
Range: Function:
0.1 Hz* [0.0 - 20.0 Hz] Set the output frequency at which to activate par.1-80 Function at Stop .
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-26 MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage