Allen-Bradley PowerFlex 70 Enhanced Control, Справочное руководство, Страница: 32 / 170

28 Digital Inputs
Example 2
A drive is faulted and the “Run Level” input is held closed the entire time. Next, the network issues
a “Stop/Clear Faults” command, or another digital input programmed for “Stop/Clear Faults” is
activated, or the “Stop button is pressed on the HIM. The drive will not restart until the “Run Level”
input is opened and then re-closed, because the fault clearing method used was combined with a
stop command.
Example 3
The drive is stopped by the network issuing a “Stop/Clear Faults” command, or another digital input
programmed for “Stop/Clear Faults” being activated, or the “Stop” button being pressed on the
HIM. The drive will not restart until the “Run Level” input is opened and then re-closed, because
the fault clearing method used was one that is combined with a stop command.
Example 4
The drive is stopped by opening a digital input that is programmed for “Enable.” The Run Level
input is held closed the entire time. Next, the Enable input is re-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.
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Run w/Comm
All other “Run” digital input settings prohibit communication devices from
starting the drive. “Run w/Comm” allows communication adapters to start the
drive even if the digital input “Run w/Comm” is in the open state. In addition,
the communication device must have given up its ownership in order for
transitions on the “Run w/Comm” digital input to take any action.
•
Start
An open to closed transition while the drive is stopped will cause the drive to
run in the current direction, unless the “Stop-Clear Faults” input function is
open. If “Start” is configured, then “Stop-Clear Faults” must also be configured.
•
Forward/Reverse
This function is one of the ways to provide direction control when the “Start” or
“Run” functions (not combined with direction) are used.
An open input sets direction to forward. A closed input sets direction to reverse.
If state of input changes and drive is running or jogging, drive will change
direction.
•
Jog Forward, Jog Reverse
Jog is a non-latched command such as Run, but overrides the normal speed
reference and uses [Jog Speed 1].
An open to closed transition on one input or both inputs while the drive is
stopped will cause the drive to jog unless the “Stop - Clear Faults” input
function is configured and open. The table below describes the actions taken by
the drive in response to various states of these input functions.
Jog Forward Jog Reverse Action
Open Open Drive will stop if already jogging, but can be started by other
means. Terminal block relinquishes direction ownership.
Open Closed Drive jogs in reverse direction. Terminal block takes direction
ownership.
Closed Open Drive jogs in forward direction. Terminal block takes direction
ownership.
Closed Closed Drive continues to jog in current direction, but terminal block
maintains direction ownership.