Safety Relay User Manual Owner's manual

104 Rockwell Automation Publication 440C-UM001C-EN-P - November 2014
Chapter 15 Troubleshooting
Nonrecoverable Faults
Nonrecoverable faults and failures are malfunctions of the device itself that occur
during operation. These faults are detected by internal monitoring measures
helping to ensure the safety integrity of the device itself. Nonrecoverable faults
require a power cycle to allow CR30 to perform all relevant internal system tests
during initialization. If there are transient malfunctions, CR30 will recover after
power cycle. If there is permanent damage or malfunction, the CR30 will remain
in safe-state after power cycle. Permanent nonrecoverable faults are typically
related to random hardware faults that cause permanent damage of components.
Potential root cause for nonrecoverable faults:
• Transient EMC disturbance causing asynchrony of the two CPU
• Environmental disturbances of high voltage or high current spikes that
cause internal damage of components
• Power supply interruptions that are detected by internal voltage level
monitor
• Transient overload conditions of safety outputs that trigger short circuit
and overload protection or the output (for example, high inrush currents)
Troubleshooting with the
CCW
When connected to the CR30 through the USB port, the CCW Logic Editor
monitors and displays the status of each terminal and block.
• Green shows an ON (HI) state.
• Red shows a Fault state (output is LO).
• Grey blocks are OFF (LO) state.
Figure 122 - Monitor Status with Logic Editor
Mouse over the red block, and the CCW displays an error message for 5 seconds.
Move the mouse away and then back over the block to show the message again.