3-87 Check Valve Ramp End Speed [HZ]
Range: Function:
valve ramp is no longer active. See
Illustration 3.24.
3-88 Final Ramp Time
Range: Function:
0 s* [0 -
60 s]
Enter the nal ramp time to be used when ramping
down from parameter 4-11 Motor Speed Low Limit
[RPM] or parameter 4-12 Motor Speed Low Limit [Hz]
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
parameter 4-11 Motor Speed Low Limit [RPM] or
parameter 4-12 Motor Speed Low Limit [Hz] to zero
speed. See Illustration 3.23.
3.5.6 3-9* Digital Pot.Meter
Use the digital potentiometer function to increase or
decrease the actual reference by adjusting the set-up of
the digital inputs using the functions increase, decrease, or
clear. To activate the function, at least 1 digital input must
be set to increase or decrease.
3-90 Step Size
Range: Function:
0.10 %
*
[0.01 -
200 %]
Enter the increment size required for
increase/decrease as a percentage of the
synchronous motor speed, n
s
. If increase/
decrease is activated, the resulting reference
is increased or decreased by the value set in
this parameter.
3-91 Ramp Time
Range: Function:
1
s
[0 -
3600 s]
Enter the ramp time, that is the time for adjustment
of the reference 0–100% of the specied digital
potentiometer function (increase, decrease, or clear).
If increase/decrease is activated for longer than the
ramp delay period specied in parameter 3-95 Ramp
Delay, the actual reference is ramped up/down
according to this ramp time. The ramp time is
dened as the time spent to adjust the reference by
the step size specied in parameter 3-90 Step Size.
3-92 Power Restore
Option: Function:
[0] * O Resets the digital potentiometer reference to 0% after
power-up.
[1] On Restores the most recent digital potentiometer
reference at power-up.
3-93 Maximum Limit
Range: Function:
100 %* [-200 -
200 %]
Set the maximum allowed value for the
resulting reference. This is recommended if
the digital potentiometer is used for ne-
tuning of the resulting reference.
3-94 Minimum Limit
Range: Function:
0 %* [-200 -
200 %]
Set the minimum allowed value for the
resulting reference. This is recommended if
the digital potentiometer is used for ne-
tuning of the resulting reference.
3-95 Ramp Delay
Range: Function:
Size
related*
[ 0 -
0 ]
Enter the delay required from activation of
the digital potentiometer function until the
frequency converter starts to ramp the
reference. With a delay of 0 ms, the reference
starts to ramp when increase/decrease is
activated. See also parameter 3-91 Ramp Time.
Speed
Time (s)
Inc
130BA158.11
P 3-95
Illustration 3.25 Ramp Delay Case 1
Speed
Time (s)
Dec
Inc
130BA159.11
P 3-95
Illustration 3.26 Ramp Delay Case 2
Parameter Description Programming Guide
MG20OB02 Danfoss A/S © 05/2018 All rights reserved. 71
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