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.
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.
VLT
®
AQUA Drive
Operating Instructions
8. How to programme the frequency converter
MG.20.M5.02 - VLT
®
is a registered Danfoss trademark
79
8
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