Danfoss VLT AQUA Drive FC 202 Programming Manual page 73

Parameter Description
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valve ramp is no longer active.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 - Enter the final ramp time to be used when ramping
*
60 s] 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 - Enter the increment size required for
200 %] increase/decrease as a percentage of the
*
synchronous motor speed, n
decrease is activated, the resulting reference
is increased or decreased by the value set in
this parameter.
3-91 Ramp Time
Range: Function:
1 [0 - Enter the ramp time, that is the time for adjustment
s 3600 s] of the reference 0–100% of the specified digital
potentiometer function (increase, decrease, or clear).
If increase/decrease is activated for longer than the
ramp delay period specified in parameter 3-95 Ramp
Delay, the actual reference is ramped up/down
according to this ramp time. The ramp time is
defined as the time spent to adjust the reference by
the step size specified in parameter 3-90 Step Size.
3-92 Power Restore
Option: Function:
[0] Off Resets the digital potentiometer reference to 0% after
*
power-up.
[1] On Restores the most recent digital potentiometer
reference at power-up.
MG20OB02
Programming Guide
3-93 Maximum Limit
Range:
100 %
*
3-94 Minimum Limit
Range:
0 %
*
200 %]
3-95 Ramp Delay
Range:
Size
related
*
Speed
Inc
Illustration 3.25 Ramp Delay Case 1
. If increase/
s
Speed
Dec
Inc
Illustration 3.26 Ramp Delay Case 2
Danfoss A/S © 05/2018 All rights reserved.
Function:
[-200 - Set the maximum allowed value for the
200 %] resulting reference. This is recommended if
the digital potentiometer is used for fine-
tuning of the resulting reference.
Function:
[-200 - Set the minimum allowed value for the
resulting reference. This is recommended if
the digital potentiometer is used for fine-
tuning of the resulting reference.
Function:
[ 0 - Enter the delay required from activation of
0 ] 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.
P 3-95
P 3-95
3 3
Time (s)
Time (s)
71