Rockwell Automation 8720MC High Performance Drives Installation Manual - Manual (Page 50)

Publication 8720MC-IN001D-EN-P — December 2002
2-16 8720MC Connector Data
Digital Outputs
Six discrete solid state DC current sourcing outputs are available in the
8720MC Drive. These outputs are optically isolated to 500V from
control power. Considering the limitation of 120 mA (total) at 24V dc
of the 8720MC 24V dc power supply, all power to the 24V dc digital
I/O should be, in most cases, provided externally by the user.
Default Digital Output Descriptions
Zero Speed - Parameter 124 is used to determine the zero speed
window. When the motor velocity falls within the configured zero
speed window for 50 ms, the zero speed output is set true.
Shut Down Fault - Parameter 11 contains a bit pattern which
describes a set of different conditions which can initiate a shut down
fault. When any of these conditions exist, the Shut Down Fault output
will be true. Selection of parameter 11 in display mode via the HIM or
DriveExplorer™ will allow access to a 16 character display describing
the fault.
Auto Reference Enabled - Parameter 529 (P00029) is an event link
which indicates that there are no drive faults, the drive is enabled in
auto mode, and capable of following the auto reference. This event
has a default link to both the digital interface and the SCANport Logic
Status Word.
Orient complete - When an orient is initiated and the orient position
is achieved, the drive will enter an orient position achieved state. The
Orient Complete output is used to indicate to the motion controller
that the orient position achieved state is established. The orient
complete output is turned off when the motor leaves the orient
position.
Torque
≥ ≥ ≥ ≥ Torque Limit - Parameters 82 and 83 are configuration
parameters which establish the + and - torque limits for the
application. There are 8 sets of torque limits since they are part of the
servo parameter sets. If any of these torque limits are reached or
exceeded, the Torque
≥ Torque Limit Output is enabled. Use
Parameter 520 to determine the source of the torque limit
At Speed - Parameter 157 is a configuration parameter which
establishes the At Speed Window. When the velocity error represented
by the difference between the commanded velocity and the feedback
velocity
is less than parameter 157, the At Speed output is enabled.