Danfoss VLT Instruction Manual page 81

VLT ® HVAC Drive Instruction Manual
NOTE!
It is important to set motor par. 1-2* Motor Data correctly, since these form part of the AMA algorithm. An AMA must be performed
to achieve optimum dynamic motor performance. It may take up to 10 min., depending on the motor power rating.
NOTE!
Avoid generating external torque during AMA
NOTE!
If one of the settings in par. 1-2* Motor Data is changed, par. 1-30
motor parameters, will return to the default setting.
This parameter cannot be adjusted while the motor is running.
NOTE!
Full AMA should be run without filter only while reduced AMA should be run with filter.
Automatic Motor Adaptation
See section
1-71 Start Delay
Range:
0.0 s* [0.0 - 120.0 s]
1-73 Flying Start
Option:
[0] * Disabled
[1] Enabled
1-80 Function at Stop
Option:
[0] * Coast
[1] DC Hold/Motor Preheat
- application example.
Function:
The function selected in par.1-80
Enter the time delay required before commencing acceleration.
Function:
This function makes it possible to catch a motor that is spinning freely due to a line drop-out.
Flying Start
When par.1-73
Search direction for flying start is linked to the setting in par.4-10
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
take place from 0 Hz.
Disable
Select [0] if this function is not required
Enable
Select [1] to enable the adjustable frequency drive to "catch" and control a spinning motor.
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
Leaves motor in free mode.
Energizes motor with a DC holding current (see par.2-00
MG.11.A9.22 - VLT ® is a registered Danfoss trademark
6 How to program the adjustable frequency
Stator Resistance (Rs) to par. 1-39
Function at Stop
is active in the delay period.
Start Delay
is enabled, par.1-71 has no function.
Min Speed for Function at Stop [RPM]
DC Hold/Preheat Current
drive
Motor Poles , the advanced
Motor Speed Direction
.
DC Braking Time . Start will then
.
).
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6