Control macros 111
Motor potentiometer macro
The motor potentiometer macro can be used to adjust the speed of the motor with
two-push buttons or with PLCs that change the speed of the motor using two digital
signals.
The source for the digital signals, used to increase the values, can be selected by
parameters 22.73 Motor potentiometer up source and 22.74 Motor potentiometer
down source.
When enabled by 22.71 Motor potentiometer function, the motor potentiometer
assumes the value set by 22.72 Motor potentiometer initial value. Depending on the
mode selected in 22.71, the motor potentiometer value is either retained or reset over
a power cycle.
The time to increase the speed from the minimum (22.76 Motor potentiometer min
value) to the maximum (22.77 Motor potentiometer max value) is defined in the
parameter 22.78 Motor potentiometer ramp up.
The time to decrease the speed from the maximum (22.77 Motor potentiometer max
value) value to the minimum (22.76 Motor potentiometer min value) value is defined
in the parameter 22.79 Motor potentiometer ramp down.
If the up and down signals are simultaneously on, the motor potentiometer value does
not change.
The output of the function is shown by 22.80 Motor potentiometer ref act, which can
directly be set as the reference source in the main selector parameters, or used as an
input by other source selector parameters, both in scalar and vector control.
The following example shows the behavior of the motor potentiometer value.
Parameters 22.73 Motor potentiometer up source and 22.74 Motor potentiometer
down source control speed or frequency from zero to maximum speed or frequency.
0
1
0
1
0
22.80
22.74
22.73
22.77
22.76
2
2
.
7
8
2
2
.
7
9
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