Danfoss VLT AQUA Operating Instructions Manual page 98

6 How to Programme the Low Harmonic Drive
3-87 Check Valve Ramp End Speed [Hz]
Range:
0 [Hz]* [0 – Motor Speed Low Limit [Hz]]
6
3-88 Final Ramp Time
Range:
0 [s]* [0 – 60 [s]]
6.3.5 4-** Limits and Warnings
Parameter group for configuring limits and warnings.
4-11 Motor Speed Low Limit [RPM]
Range:
Application [Application dependant]
dependent*
98
Function:
Set the speed in [Hz] below Motor Speed Low Limit where the Check Valve Ramp will no longer be
active.
Function:
Enter the Final Ramp Time to be used when ramping down from Motor Speed Low Limit, par. 4-11
or 4-12, to zero speed.
Submersible deep well pumps can be damaged by running below minimum speed. A fast ramp time
below minimum pump speed is recommended. This parameter may be applied as a fast ramp rate
from Motor Speed Low Limit to zero speed.
Function:
Enter the minimum limit for motor speed. The Motor Speed Low Limit can be set to correspond to
the manufacturer's recommended minimum motor speed. The Motor Speed Low Limit must not
Motor Speed High Limit [RPM] .
exceed the setting in par. 4-13
®
MG.20.T1.02 - VLT is a registered Danfoss trademark
VLT AQUA Low Harmonic Drive Operating In-
structions