Danfoss VLT Automation VT Drive FC 322 Programming Manual page 64

2 Parameter Description
3-88 Final Ramp Time
Range:
0 [s]* [0 – 60 [s]]
2
2.5.6 3-9* Digital Pot.Meter
The digital potentiometer function allows the user 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 one digital input must be set up to INCREASE or DECREASE.
3-90 Step Size
Range:
0.10 %* [0.01 - 200.00 %]
3-91 Ramp Time
Range:
1.00 s [0.00 - 3600.00 s]
3-92 Power Restore
Option:
[0] * Off
[1] On
3-93 Maximum Limit
Range:
100 %* [-200 - 200 %]
62
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Function:
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.
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 Motor Speed Low Limit to zero speed.
Function:
Enter the increment size required for INCREASE/DECREASE, as a percentage of the synchronous
motor speed, n . If INCREASE/ DECREASE is activated the resulting reference will be increased /
s
decreased by the amount set in this parameter.
Function:
Enter the ramp time, i.e. the time for adjustment of the reference from 0% to 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
par. 3-95 Ramp Delay the actual reference will be ramped up / down according to this ramp time.
The ramp time is defined as the time used to adjust the reference by the step size specified in
par. 3-90 Step Size .
Function:
Resets the Digital Potentiometer reference to 0% after power up.
Restores the most recent Digital Potentiometer reference at power up.
Function:
Set the maximum permissible value for the resultant reference. This is advisable if the Digital Po-
tentiometer is used for fine tuning of the resulting reference.
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
Programming Guide