Danfoss VLT FC 100 Series Programming Manual page 45

®
VLT HVAC Drive Programming Guide
1-71 Start Delay
Range:
*
0.0s [0.0 - 120.0 s]
1-73 Flying Start
Option:
* Disabled
[0]
[1] Enabled
3.3.7. 1-8* Stop Adjustments
Parameters for setting special stop features for the motor.
1-80 Function at Stop
Option:
*
Coast
[0]
* DC hold/Preheat
[1]
1-81 Min Speed for Function at Stop [RPM]
Range:
*
3 RPM [0 - 600 RPM]
1-82 Min Speed for Function at Stop [Hz]
Range:
*
0.0 Hz [0.0 - 500 Hz]
3.3.8. Trip at Motor Speed Low Limit
In par. 4-11 and 4-12, Motor Speed Low Limit
In some cases e.g. if operating in current limit because of a defect in the compressor, the output motor speed can be suppressed below Motor Speed
Low Limit. To prevent damage to the compressor it is possible to set trip limit. If the motor speed drops below this limit, the frequency converter will trip
and issue an alarm (A49).
Reset will take place according to the selected function in
If the trip must take place at a rather exact speed (RPM), it is recommended to set
can be set in par. 1-62.
Function:
Function at Stop
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.
Select Disable [0] if this function is not required
Enable
Select [1] to enable the frequency converter to "catch" and control a spinning motor.
When par. 1-73 is enabled, par. 1-71
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
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:
Set the speed at which to activate par. 1-80
Function:
Set the output frequency at which to activate par. 1-80
, it is possible to set a minimum speed for the motor in order to ensure proper oil distribution.
par. 14-20, Reset Mode
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
is active in the delay period.
Start Delay
has no function.
Motor Speed Direction.
Braking Time . Start will then take place from 0 Hz.
.
Function at stop .
Function at stop .
.
par. 0-02 Motor Speed Unit
for RPM and use slip compensation, which
3. Parameter Description
45
3