Digital Inputs
27
•
Run Forward, Run Reverse
These settings cause the drive to run and with a specific direction, as long as the
configured input is held closed. Also, these “2-wire” settings prevent any other
connected device from starting the drive. To use a “2-wire” digital input setting
that is compatible with start commands from a communication adapter, see
"Run w/Comm" on
page 28
.
An open to closed transition on one input or both inputs while the drive is
stopped will cause the drive to run unless the “Stop - Clear Faults” input
function is configured and open.
The table below describes the basic action taken by the drive in response to
particular states of these input functions.
It is not necessary to program both “Run Forward” and “Run Reverse.” These
two functions will operate with or without each other.
Important:
Direction control is an “Exclusive Ownership” function (see
Owners). This means that only one control device (terminal block,
DPI device, HIM, etc.) at a time is allowed to control direction at a
time. The terminal block must become direction “owner” before it
can be used to control direction. If another device is currently the
direction owner (as indicated by [Direction Owner]),
it will not be
possible to start the drive or change direction by using the
terminal block digital inputs programmed for both Run and
Direction control (e.g. Run/Fwd).
•
Run
This setting is similar to “Run Forward” and “Run Reverse” settings. The only
difference being that direction is determined by another input or another
device’s command (HIM or comm adapter).
•
Run Level, RunFwd Level, and RunRev Level
The “non-level” version of these “2-wire” control functions require a rising edge
(open to close transition) in order for the drive to run. As long as a separate
“Stop” command is not issued, these “level” versions do not require a rising
edge, the level alone (no rising edge required) determines whether or not the
drive will run.
Example 1
A drive is faulted and the “Run Level” input is held closed the entire time. Next, the network issues
a “Clear Faults” command or another digital input programmed for “Clear Faults” is closed. The
drive will immediately restart as long as the “Run Level” input is closed, even if this input did not get
opened and then re-closed.
Run Forward
Run Reverse Action
Open
Open
Drive stops, terminal block relinquishes direction ownership.
Open
Closed
Drive runs in reverse direction, terminal block takes direction
ownership.
Closed
Open
Drive runs in forward direction, terminal block takes direction
ownership.
Closed
Closed
Drive continues to run in current direction, but terminal block
maintains direction ownership.