Danfoss VLT FC 102 Operating Instructions Manual page 96

6 How to Programme the Low Harmonic Drive
NB!
Avoid generating external torque during AMA.
NB!
If one of the settings in par. 1-2* Motor Data is changed, par. 1-30
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.
6
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
1-90 Motor Thermal Protection
Option:
96
Stator Resistance (Rs) to par. 1-39 Motor Poles , the advanced
Function:
Function at Stop is active in the delay period.
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 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
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
take place from 0 Hz.
Select Disable [0] if this function is not required
Enable [1] to enable the frequency converter to "catch" and control a spinning motor.
Select
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] .
Leaves motor in free mode.
Energizes motor with a DC holding current (see par. 2-00
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
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 and the rated motor frequency f
M,N
load at lower speed due to less cooling from the fan incorporated in the motor.
®
MG.16.A1.02 - VLT is a registered Danfoss trademark
VLT HVAC Low Harmonic Drive Operating In-
Motor Speed Direction .
DC Braking Time . Start will then
DC Hold/Preheat Current ).
. The calculations estimate the need for a lower
M,N
structions
Ther-