Danfoss VLT HVAC Series Programming Manual page 51

VLT ® HVAC Drive Programming Guide
3.3.8 Trip at Motor Speed Low Limit
In par.4-11 Motor Speed Low Limit [RPM]
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 adjustable frequency drive
will trip and issue an alarm (A49).
Reset will take place according to the selected function in par.14-20
If the trip must take place at a rather exact speed (RPM), it is recommended to set par.0-02
Slip Compensation
can be set in par.1-62
NOTE!
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)
NOTE!
Trip will not be active when using a normal stop or coast command.
1-86 Trip Speed Low [RPM]
Range:
0 RPM* [0 - par. 4-13 RPM]
NOTE!
This parameter is only available if par.0-02
1-87 Trip Speed Low [Hz]
Range:
0.0 Hz* [0.0 - par. 4-14 Hz]
NOTE!
This parameter is only available if par.0-02
and par.4-12 Motor Speed Low Limit [Hz]
Reset Mode
.
.
Function:
If the trip speed is set to 0, the function is not active.
Motor Speed Unit
Function:
If the trip speed is set to 0, the function is not active.
Motor Speed Unit
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
, it is possible to set a minimum speed for the motor in order to
.
Motor Speed Unit
for RPM and use slip compensation, which
is set to [RPM].
is set to [RPM].
3 Parameter Description
3
3-27