KEB COMBIVERT F4-C Applications Manual page 179

Functional Description
Define Inputs
Motor Potentiometer/Function
(oP.26)
Motor Potentiometer/
Rise Time (oP.29)
Prescaler (oP.30)
Operating Range
(oP.27, oP.28)
Indication of Motor
Potentometer Value (ru.34)
Chapter Section Page
6 9 14
At first 2 inputs must be defined with which the motor potentiometer can be increased
or decreased. For that two of the parameters di.3...di.10, depending on the selected
inputs, are assigned with the value 7 and 8.
Increase motor pot. value
Value 7
If necessary, a further input can be used to reset the motor potentiometer to the
adjusted minimum frequency (forward). Value 10 is assigned to this input.
In case both inputs increase/decrease potentiometer value are set at the same time,
the potentiometer value is decreased.
With oP.26 some basic operating methods of the motor potentiometer are defined.
The parameter is bit-oriented.
Value Significance
8 4 2 1
x x x 0 motor potentiometer can be differently programmed in all parameter
sets
x x x 1 motor potentiometer is not set programmable
x x 0 x after a Power-On reset the last potentiometer value is adjusted
x x 1 x after a Power-On reset the potentiometer value is set to 0%
0 0 x x rise time of 0...100% of motor potentiometer 16 s
0 1 x x rise time of 0...100% of motor potentiometer 33 s
1 0 x x rise time of 0...100% of motor potentiometer 66 s
1 1 x x rise time of 0...100% depending on parameter oP.29
1 0 0 0 = 8 (Default value)
With this parameter the time is defined that is required by the motor potentiometer to
drive from 0...100%. The adjusted time becomes effective when the value > 12 is
adjusted in parameter oP.26. The time is adjustable between 0...300s.
If the motor potentiometer function is not used for setpoint value setting but instead
e.g. for gearbox factor adjustment, it is possible that the adjusted time is too short. By
means of oP.30 the time can be extended according to following table.
oP.30
Multiplier
Actual time = adjusted time x multiplier
The absolute set value limits of the motor potentiometer (-100%...0...+100%) are
defined by the minimum/maximum frequencies (oP.4 and 5 or oP.6 and 7). The
operating range can be limited further by parameters oP.27 and oP.28 (see Fig. 6.9.13).
If the direction of rotation shall alos be set by the motor potentiometer (oP.0 = 17) the
parameter oP.27 (operating range min.) is to be adjusted to a negative value.
This parameter shows the actual percentage of the motor potentiometer. With the
keys Up and Down the value can be changed. However, at that the adjusted times
are not taken into account.
Date
Name: Basis Name: Basis
KEB COMBIVERT F4-C
29.01.98
Decrease motor pot. value
⇓
0 1 2 3 4
1 2 4 8 16 32
Special Functions
⇓
Value 8
5 6 7 8
64 128 256
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