Motor Potentiometer - Lenze 4800 Manual

Show/Hide Bookmarks
7.5.3

Motor potentiometer

Purpose
The motor potentiometer serves as alternative set-value source which can be
controlled with 2 keys.
FIG 7-30
The motor potentiometer is a function unit which can be assigned to different
inputs.
With the function "freely assignable analog inputs" the motor potentiometer output
can be assigned to the targets listed under C146.
Note!
The output of the motor potentiometer cannot be directly assigned to the field
current set-value selection. If this should be required, another function block can
be connected in between (e.g. limitation element).
Example :
C145 = -8-
C146 = -23-
C145 = -19-
C146 = -5-
The signal resolution is [14 bit] (-16384 ... +16384), except for the targets
C146 = -10- C027 of digital input X5
C146 = -11- C027 of digital input X9
C146 = -12- gearbox factor C032
C146 = -13- phase trimming C256
the controller works with a resolution of [15 bit-1] (-32767 ... +32767)
As soon as the motor potentiometer is assigned to an input or a code, the direct
access to this codes is no longer possible.
The motor potentiometer output can also be output as analog voltage via the
monitor output.
The output value of the motor potentiometer is displayed under the code (e.g.
C046, C047)assigned to the motor potentiometer. The functions ctrl. inhibit, TRIP
and QSP have no influence on the motor potentiometer because it is an
independent block.
After motor potentiometer activation all other control functions remain active.
M o t o r
p o t e n t i o -
m e t e r
Motor potentiometer
Select motor potentiometer output
Assign limitation element 1
Select limitation element 1 output 1
Assign field-current set-value
Configuration
4900Str057
48XX/49XXSHB0399
7-73