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CHAPTER 8 SYSTEM MAINTENANCE
4. FAULT DIAGNOSTICS
4.1 Fault Information and Fault Diagnostics
In case of trouble with the ACD system, alarms are indicated or system messages are displayed. By collecting
such fault information promptly, the faulty positions can be diagnosed and recovery operations can be started
quickly. Figure 8-2 shows the flow from the occurrence of a fault to its diagnostics.
Figure 8-2 Flow from Fault Occurrence to Fault Diagnostics
Fault Occurrence
Fault Information Collection
• Alarm
• System Message
• Fault detected during routine
maintenance
4.2 Diagnostics from System
Messages
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