2-74 Digital Inputs
This input is not used for a fast output power removal. The drive will not
stop running until the software detects the open state of this input
function.
If multiple “Enable” inputs are configured, then the drive will not run if
any of the inputs are open.
• Exclusive Link
This input function is used to activate the state of the input to control one
of the drive’s digital outputs. See Digital Outputs
.
If an Input is so configured, no function exists for the input until
complementary Digital Output programming is done. If no outputs are
programmed (linked), the input has no function.
This choice is made when the user wishes to link the input to the output,
but desires that no other functionality be assigned to the input.
The state of any digital input can be “passed through” to a digital output
by setting the value of a digital output configuration parameter ([Digital
Outx Sel]) to “Input n Link”. The output will then be controlled by the
state of the input, even if the input is being used for a second function. If
the input is configured as “Not used” input function, the link to the input
is considered non-functional.
• Power Loss Level (PowerFlex 700 only)
When the DC bus level in the drive falls below a certain level, a “power
loss” condition is created in the drive logic. This input allows the user to
select between two different “power loss” detection levels dynamically.
If the physical input is closed, then the drive will take its power loss level
from [Power Loss Level]. If the physical input is open (de-energized),
then the drive will use a power loss level designated by internal drive
memory, typically 82% of nominal.
If the input function is not configured, then the drive always uses the
internal power loss level. This input function is used in PowerFlex 700
drives only. In PowerFlex 70 drives, the power loss level is always
internal and not selectable.
• Precharge Enable (PowerFlex 700 only)
This input function is used to manage disconnection from a common DC
bus.
If the physical input is closed, this indicates that the drive is connected to
common DC bus and normal precharge handling can occur, and that the
drive can run (start permissive). If the physical input is open, this
indicates that the drive is disconnected from the common DC bus, and
thus the drive should enter the precharge state (precharge relay open) and
initiate a coast stop immediately in order to prepare for reconnection to
the bus.
If this input function is not configured, then the drive assumes that it is
always connected to the DC bus, and no special precharge handling will
be done. This input function is used in PowerFlex 700 drive only. In
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