Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 74)

74 Publication 1756-UM525A-EN-P - June 2003
Chapter 4 Using the 1756-HYD02 Module Features
Fault Actions Tab
You must set the action if any of the faults listed in Table occurs. The possible
options are:
• Shutdown
• Disable Drive
• Stop Motion
• Status Only - When this option is chosen for any fault condition, the
fault does not cause the axis to stop its current motion. However, new
motion is prevented from starting.
The table below lists the faults that may occur:
Output Offset Corrects the problem of axis “offset”, by adding a fixed voltage value (not to exceed +/-10V) to the analog
output value. Use a value to achieve near zero axis velocity when the uncompensated analog output value
is zero.
When interfacing to a valve on a hydraulic axis, it is necessary to compensate for the effect of drive offset.
Cumulative offsets of the hydraulic module’s DAC output and the Axis Input result in a situation where a
zero commanded analog output value causes the axis to “drift”. If the drift is excessive, it can play havoc on
the Hookup Diagnostic and Tuning procedures, as well as result in a steady-state non-zero position error
when the axis loop is closed.
Manual Adjust Click on this button to access the Offset tab of the Manual Tune dialog for online editing.
The Manual Tune button is disabled when RSLogix 5000 is in Wizard mode, and when you have not yet
saved or applied your offline edits to the above parameters.
Feature: Definition:
Fault Type: Definition:
Drive Fault Specifies the fault action to be taken when a drive fault condition is detected, for an axis with the Drive
Fault Input enabled (in the Servo tab of this dialog) that is configured as Servo (in the General tab of this
dialog).
Feedback Noise Specifies the fault action to be taken when excessive feedback noise is detected.
Feedback Specifies the fault action to be taken when feedback loss condition is detected.
ATTENTION: If a feedback fault occurs, the 1756-HYD02 module cannot control the axis. We recommend
you use either the shutdown or disable drive option for this setting. If used, the stop motion
and status only options may cause dangerous conditions when a feedback fault occurs.
Position Error Specifies the fault action to be taken when position error exceeds the position tolerance set for the axis, for
an axis configured as Servo (on the General tab).
Soft Overtravel Specifies the fault action to be taken when a software overtravel error occurs, for an axis with Soft Travel
Limits enabled and configured (on the Limits tab) that is configured as Servo (on the General tab).