Digital Inputs 2-61
Digital Inputs Cable Selection
Refer to “Wiring and Grounding Guidelines for Pulse Width Modulated
(PWM) AC Drives,” publication DRIVES-IN001 for detailed information
on Cable Selection for Digital Inputs.
Wiring Examples
Refer to the appropriate PowerFlex user manual for wiring diagrams.
PowerFlex 70
Each digital input has a maximum response/pass through/function
execution time of 25ms. For example, no more than 25ms should elapse
from the time the level changes at the Start input to the time voltage is
applied to the motor.
There is both hardware and software filtering on these inputs. The hardware
provides an average delay of 12ms from the time the level changes at the
input to the earliest time that the software can detect the change. The actual
time can vary between boards from 7 to 17ms, but any particular board
should be consistent to within 1% of its average value. The amount of
software filtering is not alterable by the user.
PowerFlex 700
Each digital input has a maximum response/pass through/function
execution time of 25ms. This means that, for example, no more than 25ms
should elapse from the time the level changes at the Start input to the time
voltage is applied to the motor.
Digital Input Configuration
Inputs are configured for the required function by setting a [Digital Inx Sel]
parameter (one for each input). These parameters cannot be changed while
the drive is running.
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