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
).
1-81 Min Speed for Function at Stop [RPM]
Range: Function:
Application
dependent*
[0 - 600 RPM] Set the speed at which to activate par. 1-80
Function at Stop
.
1-82 Min Speed for Function at Stop [Hz]
Range: Function:
Application
dependent*
[Application dependant] Set the output frequency at which to activate par. 1-80
Function at Stop
.
3.3.8 Trip at Motor Speed Low Limit
In par. 4-11
Motor Speed Low Limit [RPM]
and par. 4-12
Motor Speed Low Limit [Hz]
it is possible to set a minimum speed for the motor in order to
ensure proper oil distribution.
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 par. 14-20
Reset Mode
.
If the trip must take place at a rather exact speed (RPM), it is recommended to set par. 0-02
Motor Speed Unit
for RPM and use slip compensation, which
can be set in par. 1-62
Slip Compensation
.
NB!
To achieve the highest accuracy with the slip compensation, an Automatic Motor Adaptation (AMA) should be performed. To be enabled
in par. 1-29
Automatic Motor Adaptation (AMA)
.
NB!
Trip will not be active when using a normal stop- or coast command.
1-86 Trip Speed Low [RPM]
Range: Function:
0 RPM* [Application dependant] Set the desired motor speed for trip limit. If the Trip Speed is set to 0, the function is not active. If
the speed at any time after the start (or during a stop) falls below the value in the parameter, the
drive will trip with an alarm [A49] Speed Limit. Function at stop.
NB!
This parameter is only available if par. 0-02
Motor Speed Unit
is set to [RPM].
3 Parameter Description VLT
®
HVAC Drive Programming Guide
56
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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