Danfoss VLT FC 103 Programming Manual page 55

Parameter Description
3-82 Starting Ramp Up Time
Range:
Size related
*
3600 s]
3 3
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 %]
3-91 Ramp Time
Range:
1 s [0 -
3600 s]
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:
100 % [-200 - 200
*
%]
54
Function:
[0.01 - The ramp-up time is the acceleration
time from 0rpm to the nominal motor
speed set in 3-82 Starting Ramp Up
Time when Compressor Torque is
active in 1-03 Torque Characteristics.
Function:
Enter the increment size required for
INCREASE/DECREASE, as a percentage of
the synchronous motor speed, n
INCREASE/DECREASE is activated the
resulting reference will be increased/
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 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 3-90 Step Size.
Function:
Set the maximum permissible value for
the resultant reference. This is advisable if
the Digital Potentiometer is used for fine
tuning of the resulting reference.
MG16H102 - VLT
®
VLT Refrigeration Drive Programming Guide
3-94 Minimum Limit
Range:
0 %
*
%]
3-95 Ramp Delay
Range:
1 [0 - 3600 ] Enter the delay required from activation of the
*
Speed
. If
s
Inc
Illustration 3.18
Speed
Dec
Inc
Illustration 3.19
®
is a registered Danfoss trademark
Function:
[-200 - 200 Set the minimum permissible value for the
resultant reference. This is advisable if the
Digital Potentiometer is used for fine
tuning of the resulting reference.
Function:
digital potentiometer function until the
frequency converter 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 3-91 Ramp Time.
P 3-95
P 3-95
Time (s)
Time (s)