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
Motor Speed Low Limit [RPM]
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.
8 How to program the adjustable frequency
drive
VLT
®
AQUA Drive
Instruction Manual
8-18
MG.20.M5.22 - VLT
®
is a registered Danfoss trademark
8