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Compaq 4200 Family manual Fans, Temperature Sensing, Fan Interface

Models: 4200 Family

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Enclosure Power and Cooling 5–3

The fan mounting assembly is the element for mounting the second fan. This element has no power circuitry. It does contain a circuit board for processing signals to and from the fan.

Temperature Sensing

The power supply temperature sensor provides a temperature range signal to the EMU. The EMU can use this signal to set the fan speed.

Fan Interface

The fan mounts on the rear of the power supply. A power supply connector is the interface between the fan and the enclosure. The interface signals include:

1.Fan speed control from the EMU

2.Fan speed to the EMU through the power supply

3.Power supply high-speed enable

4.Fan operating voltage

Fans

The power supply-mounted fans cool the enclosure by circulating air through the enclosure and elements. The rate at which air moves, the airflow, determines the amount of cooling. This airflow is a function of fan speed (rpm). These fans, under the control of the EMU or the associated power supply, can operate at multiple speeds. This ensures that when the enclosure temperature changes, the fans can automatically adjust the airflow.

Should a fan fail, EMU and power supply circuitry automatically increase the speed of the operational fan to high speed. Simultaneously, the error condition is reported to the user in several ways.

NOTE: The failure of the power supply 12.5 VDC circuit disables the associated fan.

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Compaq 4200 Family manual Fans, Temperature Sensing, Fan Interface

Contents

Enclosure 4200 Family LVD Disk Enclosures Page Contents Appendix a Glossary Index List of Figures List of Tables About This Guide Introducing the EnclosureStarting the Enclosure O ModuleEnclosure Power and Cooling Appendix B, SpecificationsDisk Drives Replacing CRUsDocumentation Conventions DescriptionSymbol Related Documents Related PublicationsChapter Introducing the EnclosureDisk Enclosure Features Disk Enclosure Rear ViewPower Supplies Scsi BusesHigh Availability Data IntegrityEnclosure Layout Status Monitoring and DisplayEMU Element Replacement CRU Replacement MethodsMajor Elements Element FunctionsPower Supply-Dual Power Supply-SingleFan ModuleConnecting the Scsi Bus Cables Starting the EnclosureScsi Bus Cables Description Part Number Meters FeetLength Description Meters Feet Applying Power Installing Scsi Bus CablesVerifying Operation Rear Status LEDs Module Module Power Protection Single-Bus ModuleScsi Bus Connectors Scsi Bus TerminationStatus Displays Replacing an I/O Module Scsi Address MapSingle-Bus Module LED Displays Disk Enclosure Bay AddressesDisk Drives Typical 1-Inch Disk DriveStatus Reporting Disk StatusDisk LED Status Displays Fault Status Drive Power Drive BlankReplacing a Disk Enclosure Power and Cooling Power Supply and Fan Assembly ComponentsEnclosure Power Power OptionsTemperature Sensing FansFan Interface Replacing a Power Supply or Fan Power Supply and Fan Status DisplaysNonoperational Status Replacing CRUs Ordering a Spare CRUBasic Replacement Procedures Common Replacement ProceduresBefore starting the replacement procedure ESD ProtectionReplacing CRUs Installing a Drive Blank Replacing a Drive with a Drive BlankInsert the drive blank part-way into the enclosure Regulatory Notices FCC Class B CertificationDenmark Safety Demco Country-Specific CertificationsSpecifications Appendix BFigure B-1. Dimensions-Vertical Orientation Table B-2 Element Physical Specifications Table B-1Environmental Specifications Table B-3 Operating SpecificationsTable B-4 Shipping or Short Term Storage Specifications Power Supply without fanPower Specifications Table B-5 AC and DC Power SpecificationsAC Power Specifications Ambient temperature GlossaryEMU RAID Scsi ID Index Enclosure 4200 Family LVD Disk Enclosures User Guide Index