Section 5 Maintenance
PM861/PM864 Processor Unit in Redundant Configuration
3BSE 027 941 R301
129
PM861/PM864 Processor Unit in Redundant Configuration
Internal Battery / SB821 External Battery
Table 22. PM861/PM864 Redundant Configuration – Fault-Finding Procedure
Fault
Possible Cause and Corrective Action
DUAL LED is OFF on both
CPUs
The CPUs are in the process of being re-started
or configured. Allow time for this to finalize.
RCU Link Cable disconnected.
•
Connect the RCU Link Cable.
Different Control Software in the two CPUs.
•
Upgrade the CPUs with the same control
software.
Table 23. Internal / SB821 External Battery – Fault-Finding
Fault
Possible Cause and Corrective Action
B(attery) LED indicator on
PM8xx processor unit is
flashing
•
Renew the PM8xx internal battery
or, (if fitted)
•
Check external battery connections.
If condition persists
•
Renew the External battery, see
The system time is incorrect
following a power failure
•
Ensure that the software installed supports
the real-time clock.
•
Renew the External Battery, see
Summary of Contents for AC 800M
Page 1: ...ControlIT AC 800M Version 2 1 Controller Hardware Hardware and Operation...
Page 2: ......
Page 3: ...Controller Hardware Hardware and Operation ControlIT AC 800M Version 2 1...
Page 10: ...7DEOH RI RQWHQWV 10 3BSE 027 941 R301...
Page 20: ...Related Documentation About This Book 20 3BSE 027 941 R301...
Page 26: ...Operating Environment Safety Summary 26 3BSE 027 941 R301...
Page 42: ...Product Release History Section 1 Introduction 42 3BSE 027 941 R301...
Page 108: ...Powering from an External 24 V DC Source Section 3 Configuration 108 3BSE 027 941 R301...
Page 118: ...Verification of Redundant CPU Section 4 Operation 118 3BSE 027 941 R301...
Page 212: ...Low Voltage Directive LVD Appendix D Directive Considerations 212 3BSE 027 941 R301...
Page 214: ...Hazardous Location Approval Appendix E Standards 214 3BSE 027 941 R301...
Page 228: ...QGH 228 3BSE 027 941 R301...
Page 229: ......