Danfoss VLT HVAC Drive Instruction Manual page 77

VLT ® HVAC Drive Instruction Manual
Select
AMA of the stator resistance R
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-
Automatic Motor Adaptation
tion
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:
•
•
See section
plication example.
Reduced AMA [2] performs a reduced
in the system
s
. After a nor-
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.
Automatic Motor Adaptation
MG.11.A4.22 - VLT ® is a registered Danfoss trademark
6. How to program the adjustable frequency
1-71 Start Delay
Value:
0.0 - 120.0 s
Function:
The function selected in par. 1-80
Stop
is active in the delay period.
Enter the time delay required before com-
mencing acceleration.
1-73 Flying Start
Value:
Disabled
Enabled
Function:
This function makes it possible to catch a mo-
tor that is spinning freely due to a line drop-
out.
Description of choice:
Disable
Select [0] if this function is not re-
quired.
Enable
Select [1] to enable the adjustable fre-
quency drive to "catch" and control a spinning
motor.
When par. 1-73 is enabled, par. 1-71
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.
- ap-
Start will then take place from 0 Hz.
drive
0.0s
Function at
[0]
6
[1]
Start
77