Select
Reduced AMA
[2] performs a reduced
AMA of the stator resistance R
s
in the system
only. Select this option if an LC filter is used
between the adjustable frequency drive and
the motor.
Activate the AMA function by pressing [Hand
on] after selecting [1] or [2]. See also the sec-
tion
Automatic Motor Adaptation
. After a nor-
mal sequence, the display will read: "Press
[OK] to finish AMA". After pressing the [OK]
key, the adjustable frequency drive is ready
for operation.
Note:
• For the best adaptation of the ad-
justable frequency drive, run the
AMA on a cold motor.
• AMA cannot be performed while the
motor is spinning.
NOTE
It is important to set motor par.
1-2* Motor Data correctly, since
these form part of the AMA al-
gorithm. An AMA must be per-
formed to achieve optimum dy-
namic motor performance. It
may take up to 10 min, depend-
ing on the power rating of the
motor.
NOTE
Avoid generating external tor-
que during AMA.
NOTE
If one of the settings in par.
1-2* Motor Data is changed,
par. 1-30 to 1-39, the advanced
motor parameters, will return to
default setting.
This parameter cannot be ad-
justed while the motor is run-
ning.
See section
Automatic Motor Adaptation
- ap-
plication example.
1-71 Start Delay
Value:
0.0 - 120.0 s
0.0s
Function:
The function selected in par. 1-80
Function at
Stop
is active in the delay period.
Enter the time delay required before com-
mencing acceleration.
1-73 Flying Start
Value:
Disabled [0]
Enabled [1]
Function:
This function makes it possible to catch a mo-
tor that is spinning freely due to a line drop-
out.
Description of choice:
Select
Disable
[0] if this function is not re-
quired.
Select
Enable
[1] to enable the adjustable fre-
quency drive to “catch” and control a spinning
motor.
When par. 1-73 is enabled, par. 1-71
Start
Delay
has no function.
Search direction for a flying start is linked to
the setting in par. 4-10, Motor Speed Direc-
tion.
Clockwise
[0]: Flying start search in clockwise
direction. If not successful, a DC brake is car-
ried 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 successful, a DC brake will be activated
in the time set in par. 2-02, Braking Time.
Start will then take place from 0 Hz.
VLT
®
HVAC Drive Instruction Manual
6. How to program the adjustable frequency
drive
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
77
6
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