ABB ACS880-x04, Firmware Manual

Page: 69 / 604

Program features 69

Motor potentiometer
The motor potentiometer is, in effect, a counter whose value can be adjusted up and
down using two digital signals selected by parameters
22.73 Motor potentiometer up
source and 22.74 Motor potentiometer down source . Note that these signals have no
effect when the drive is stopped.
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 stop or a power cycle.
The change rate is defined in 22.75 Motor potentiometer ramp time as the time it
would take for the value to change from the minimum ( 22.76 Motor potentiometer min
value ) to the maximum ( 22.77 Motor potentiometer max value ) or vice versa. 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 source of any selector parameter such as 22.11 Speed ref1
source .
The following example shows the behavior of the motor potentiometer value.
Settings
Parameters 22.71 … 22.80 (page 217 ).
0
1
0
1
0
22.80
22.74
22.73
22.77
22.76
22.75