Danfoss vlt AQUA Instruction Manual page 88

8 How to program the adjustable frequency
drive
3-85 Check Valve Ramp Time
Range:
0 s* [0–60 s]
8
3-86 Check Valve Ramp End Speed [RPM]
Range:
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
3-87 Check Valve Ramp End Speed [Hz]
Range:
0 [Hz]* [0 – Motor Speed Low Limit [Hz]]
8-18
Function:
In order to protect ball check valves in a stop situation, the check valve ramp can be utilized as a
Motor Speed Low Limit [RPM]
slow ramp rate from par.4-11
[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.
Function:
and the Check Valve no longer shall be active.
Function:
Set the speed in [Hz] below Motor Speed Low Limit where the Check Valve Ramp will no longer be
active.
®
MG.20.M5.22 - VLT is a registered Danfoss trademark
®
VLT AQUA Drive
Instruction Manual
Motor Speed Low Limit
or par. 4-12