3-85 Check Valve Ramp Time
Range:
Function:
0 s*
[0 – 60 s]
In order to protect ball check valves in a stop situation, the check valve ramp can be utilized as a
slow ramp rate from par. 4-11
or par. 4-12
Motor Speed Low Limit
[Hz]
, to Check Valve Ramp End Speed, set by the user in par. 3-86 or par. 3-87. When par. 3-85 is
different from 0 seconds, the Check Valve Ramp Time is effectuated and will be used to ramp down
the speed from Motor Speed Low Limit to the Check Valve End Speed in par. 3-86 or par. 3-87.
3-86 Check Valve Ramp End Speed [RPM]
Range:
Function:
0 [RPM]*
[0 – Motor Speed Low Limit [RPM]] Set the speed in [RPM] below Motor Speed Low Limit where the Check Valve is expected to be closed
and the Check Valve no longer shall be active.
3-87 Check Valve Ramp End Speed [Hz]
Range:
Function:
0 [Hz]*
[0 – Motor Speed Low Limit [Hz]]
Set the speed in [Hz] below Motor Speed Low Limit where the Check Valve Ramp will no longer be
active.
3-88 Final Ramp Time
Range:
Function:
0 [s]*
[0 – 60 [s]]
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.
VLT AQUA High Power Operation Instructions
5 How to programme the frequency converter
MG.20.P3.02 - VLT
®
is a registered Danfoss trademark
109
5