Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 75)

Publication 1756-UM525A-EN-P - June 2003 75
Using the 1756-HYD02 Module Features Chapter 4
Table describes the possible actions if any of the faults listed in Table occurs
Fault: Definition:
Shutdown If a fault action is set to Shutdown, when the associated fault occurs:
• servo action status is immediately disabled,
• the drive output is zeroed,
and
• the appropriate drive enable output is deactivated.
Furthermore, this fault action opens the OK contact associated with the hydraulic module that can be used
to open the E-stop string to the hydraulic power unit.
Shutdown is the most severe action to a fault and it is usually reserved for faults that could endanger the
machine or the operator if power is not removed as quickly and completely as possible.
Disable Drive If a fault action is set to Disable Drive, when the associated fault occurs:
• servo action status is immediately disabled,
• the drive output is zeroed,
and
• the appropriate drive enable output is deactivated.
Stop a Motion If a fault action is set to Stop Motion, when the associated fault occurs, the axis immediately starts
decelerating the axis command position to a stop at the configured Maximum Deceleration Rate without
disabling servo action status or the hydraulic modules Drive Enable output.
This is the gentlest stopping mechanism in response to a fault. It is usually used for less severe faults. After
the stop command fault action has stopped the axis, no further motion can be generated until the fault is
first cleared.
Status Only If a fault action is set to Status Only, when the associated fault occurs, no action is taken. The application
program must handle any motion faults. In general, this setting should only be used in applications where
the standard fault actions are not appropriate.
ATTENTION: Selecting the wrong fault action for your application can cause a dangerous condition. Keep
clear of moving machinery.