Maintenance
Troubleshooting
QuickStick HT User Manual 295
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Light Stack Troubleshooting
This section covers the determination of light stack-related problems within the QuickStick
HT transport system.
Table 8-7: Light Stack Related Troubleshooting
Symptom Problem Description Corrective Action
Lights do not turn on. Power to the light stack is lost or
intermittent.
Make sure that all wiring to the
light stack is properly seated.
Verify voltage output from the
power supply.
Light stack is not wired properly. Make sure that all connections to
the light stack are properly wired
(see Light Stacks on page 252).
Make sure that the bits specified
in the Node Controller Configura-
tion File are the bits connected to
the light stack.
Light stack is not configured
properly.
Make sure that the light stack is
configured to monitor the appro-
priate paths and/or nodes.
Yellow light does not turn off. Light indicates one or more faults. Review the log file to determine
the fault (see the Node Controller
Interface User Manual,
MMI-UM001).
Red light does not turn off. Light indicates that vehicles are
stopped.
Send a move vehicle command to
any vehicle on the paths or nodes
that the light stack monitors.
Light indicates that vehicles are
stopped even though there is
motion.
Verify that the light stack is prop-
erly wired.
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