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VLT
®
HVAC Drive Programming Guide
3.5.6 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 %]
3-94 Minimum Limit
Range:
0 %*
[-200 - 200 %]
3-95 Ramp Delay
Range:
1.000 N/A*
[0.000 - 3600.000 N/A]
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.
Ramp Delay
3-95
, 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.
Function:
Set the minimum permissible value for the resultant reference. This is advisable if the Digital Po-
tentiometer is used for fine tuning of the resulting reference.
Function:
Enter the delay required from activation of the digital potentiometer function until the adjustable
frequency drive starts to ramp the reference. With a delay of 0 ms, the reference starts to ramp as
soon as INCREASE/DECREASE is activated. See also par.3-91
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3 Parameter Description
Ramp Time
.
3
3-39
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