Parameter descriptions
Motor potentiometer via digital inputs
Percent Motorpoti
Down 73
0 0 The reference percentage does not change.
1 0 The reference percentage increases at the set ramp.
0 1
The reference percentage decreases at the set
ramp.
1 1
The reference percentage is reset to the value of
Minimum Reference Percentage 518. If another
reference percentage source is selected via parame-
ter
Reference Percentage Source 1 476 or Refer-
ence Percentage Source 2
494, the reference fre-
quency is reset to the value of this source.
0 = contact open 1 = contact closed
WARNING
If a negative reference value is set, the drive is decelerated with command “Percentage
motorpoti up”. The reference value is changed in positive direction.
Limit
The reference values are limited via parameters
Minimum Reference Percentage 518 and Maximum
Reference Percentage
519.
Direction of rotation reversal
If parameter
Minimum Reference Percentage 518 is set to zero, the direction of rotation of the drive
can be reversed via the motorpoti function.
“Motorpotentiometer via digital inputs” as reference value
The function “Motorpotentiometer via digital inputs” can be selected via the following parameters:
−
Reference Percentage Source 1 476
−
Reference Percentage Source 2 494
See chapter 7.5.2 "Reference percentage channel".
Chapter 7.6.6.1 “List of control signals” contains a table summarizing the available signal sources for
parameters
Percent Motorpoti Up 72 and Percent Motorpoti Down 73.
Addition of reference values
If the reference value of the motorpoti function is added to another reference value, (via
Reference
Percentage Source 1
476 plus Reference Percentage Source 2 494):
− If the value of
Maximum Reference Percentage 519 is reached and the other reference value is
increased, the output value of the motorpoti function is reduced. It is reduced, so that the sum of
both reference values is equal to the maximum reference percentage value.
− If the value of
Minimum Reference Percentage 518 is reached and the other reference value is
reduced, the output value of the motorpoti function is increased. It is increased, so that the sum of
both reference values is equal to the minimum reference percentage value.
− In the settings for
Operation Mode 495 = "1 - (+/-reference value)" or "3 - inverted", the point of
reversal of direction of rotation can be shifted by the output value of the motorpoti function. The
drive changes its direction of rotation if the total of the two reference values changes the sign.
159
Reference Values 06/2013 Operating Instructions
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