Danfoss VLT HVAC Series User Manual

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: Function:
0.10 %* [0.01 - 200.00 %] 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 will be increased/
decreased by the amount set in this parameter.
3-91 Ramp Time
Range: Function:
1.00 s [0.00 - 3600.00 s] 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 .
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.
3-93 Maximum Limit
Range: Function:
100 %* [-200 - 200 %] 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.
3-94 Minimum Limit
Range: Function:
0 %* [-200 - 200 %] 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.
3-95 Ramp Delay
Range: Function:
1.000 N/A* [0.000 - 3600.000 N/A] 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
Ramp Time .
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark 3-39
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage