Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 60)

Interface Signal Descriptions
Chapter 7
7-56
I/O Interface Signal Descriptions This section describes the various inputs and outputs available at the stan-
dard I/O Interface connector, CN9. See Figure 7.3 for connector location.
Digital Inputs
Coast to Stop – CN9-1
The Coast to Stop input is wired in series with the coil of an auxiliary relay
that directly controls the operation of the main AC input contactor in the
drive. When this input is Off, the auxiliary relay is de-energized causing
the main contactor to open and the motor to coast to a stop. Regenerative
braking will not occur when this input is Off. When the main contactor
opens, the DC bus discharge circuit is activated and the DC bus will be
discharged to less than 10 volts within 15 seconds. Internal interlocks
require the bus to be discharged below a threshold level (requires about 4
seconds) before drive power-up sequence can be initiated again.
When this input is On, the coil circuit of the auxiliary relay is completed.
Then, when the Drive Enable input is applied, the auxiliary relay is
energized and the main AC contactor will close. If stated in digital logic
terms, this input would be called Coast to Stop.
Important: In situations requiring immediate de-energizing of the drive,
opening this input will remove power from the motor and the motor will
coast to a stop. This input must be a hardwired physical contact that is not
controlled by electronics.
ATTENTION: Hazards of severe injury or death exist from
unintended machine motion if an electronic malfunction occurs.
This input must be Off any time a person is required to physi-
cally touch any portion of the machine driven by this drive.
!
Drive Enable – CN9-2
When this input is turned On (Coast to Stop input must also be On), the
drive power-up sequence begins. After 5 to 7 seconds for DC bus
precharge (if the DC bus was discharged), the main AC contactor closes
and the Drive Ready output is turned On, which completes the power-up
sequence. The drive is now ready to run.
If the Drive Enable command is turned Off while the motor is rotating, the
drive will regeneratively brake the motor, turn the power transistors off and
open the main AC contactor. If the Coast to Stop input remains On, the DC
bus will not be discharged even though the AC contactor has been opened.
This shortens the time for the power-up sequence to about 1 second after
the Drive Enable is applied.
The Drive Enable and Forward or Reverse Run commands can be applied
simultaneously (within
±
200 ms). In this case the drive will execute the
power-up sequence and then begin running at the commanded speed.