NB!
Avoid generating external torque during AMA.
NB!
If one of the settings in par. 1-2* Motor Data is changed, par. 1-30
Stator Resistance (Rs)
to par. 1-39
Motor Poles
, the advanced
motor parameters, will return to default setting.
This parameter cannot be adjusted while the motor is running.
NB!
Full AMA should be run without filter only while reduced AMA should be run with filter.
See section:
Application Examples > Automatic Motor Adaptation
in the Design Guide.
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 which is spinning freely due to a mains 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 not finding the speed it will make a search in the other direction. If not
successful, 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 frequency converter to “catch” and control a spinning motor.
1-80 Function at Stop
Option: Function:
Select the frequency converter 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
).
1-90 Motor Thermal Protection
Option: Function:
The frequency converter determines the motor temperature for motor protection in two different
ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par. 1-93
Ther-
mistor Source
).
• Via calculation (ETR = Electronic Thermal Relay) of the thermal load, based on the actual
load and time. The calculated thermal load is compared with the rated motor current
I
M,N
and the rated motor frequency f
M,N
. The calculations estimate the need for a lower
load at lower speed due to less cooling from the fan incorporated in the motor.
6 How to Programme the Low Harmonic Drive
VLT HVAC Low Harmonic Drive Operating In-
structions
96 MG.16.A1.02 - VLT
®
is a registered Danfoss trademark
6
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