Replacing Cooling Fans

ManualsBrandsHP ManualsServerHP Integrity NonStop Service Procedures

Each enclosure has two fans, located in slots 25 and 26, on the appearance side of the

enclosure. See Location of Cooling Fans. The fan's speeds are controlled by the power

monitor and control units (PMCUs). The fans are cabled to a PMCU and to each other

through a fan interconnect cable. If one fan fails, the PMCU increases the speed of the

other fan to compensate.

PMCU

slot

Controls

the

fan in

slot

Caution: To avoid damage from overheating, observe the time limit that an

appearance-side door can be open with only one fan running. See Safe Operating

Times With Enclosure Door Open.

Preparation:

A fan can be replaced without powering off the enclosure, but it must be replaced

within the safe operating time. You do not need ESD protection to replace fans.

To replace a fan, you need:

A fan. For the part number, see fan listing in Part Number List for NonStop

S-Series CRUs.

●

A Phillips screwdriver (medium size).●

1 Unpack and inspect the replacement fan. If the fan is damaged, do not install it.

Obtain a replacement.

2 To minimize the time the door is open, have the Phillips screwdriver and a

replacement fan ready before you begin.

Removing A Fan:

The fan can be replaced by using either the OSM Service Connection or the TSM

Service Application.

Note: In OSM, the fans are enabled and disabled by selecting True and False. In

TSM, they are enabled and disabled by selecting Enable and Disable. You can check

the fan state in the Attributes dialog box or on the Attributes tab of the Details pane.

Summary of content (14 pages)

PAGE 1
Replacing Cooling Fans Each enclosure has two fans, located in slots 25 and 26, on the appearance side of the enclosure. See Location of Cooling Fans. The fan's speeds are controlled by the power monitor and control units (PMCUs). The fans are cabled to a PMCU and to each other through a fan interconnect cable. If one fan fails, the PMCU increases the speed of the other fan to compensate.
PAGE 2
3 To disable a fan using OSM: ACTION RESULT Log on to the OSM Service Connection. The Management window appears. Double-click the group that contains the fan to be removed. The modules for that group appear in the tree pane. Double-click the module that contains the fan. The devices appear. Right-click the fan to be removed. A drop-down list appears. Select Attributes and check the fan state. The Attributes Dialog Box appears. In the dialog box, the fan state should be "Enabled.
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6 Unplug the fan's power cable from the PMCU connector. See Fan and Battery Plugs and PMCU Faceplate. Caution: Wait for the fan to slow its spinning before performing Step 7. 7 Press the latch on the fan interconnect cable that connects the two fans together, and disconnect the interconnect cable. The fan that is not being replaced should begin to speed up. 8 Remove the two screws that secure the fan and remove the fan from the enclosure. Set the screws aside.
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15 Enable the fan by using either the OSM Service Connection or TSM Service Application. To enable the fan using OSM: ACTION RESULT Log on to the OSM Service Connection. The Management window appears. Double-click the group that contains the fan to be removed. The modules for that group appear in the tree pane. Double-click the module that contains the fan. The devices appear. Right-click the fan to be removed. A drop-down list appears. Select Attributes and check the fan state.
PAGE 5
Location of Cooling Fans The fans are located in slots 25 and 26 on the appearance side of the enclosure.
PAGE 6
Standard Operating Practices Caution. Replace only one CRU or FRU at a time. Attempting to replace more than one hardware component at a time might cause serious system outages, processor halts, and connectivity problems. Whenever you replace a CRU or a FRU, use the following standard operating practices to minimize any potential damage to the equipment: ● Complete HP training courses on system support for NonStop S-series servers.
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For example, if your computer room has an ambient room temperature of 25°C (77°F) and is at an altitude of 1,524 meters (5,000 feet), you have approximately 38 minutes to replace or reinstall the second fan before components inside a system enclosure overheat.
PAGE 8
ESD Guidelines Figure: Working in an ESD-Protected Environment Observe the following electrostatic discharge (ESD) guidelines whenever servicing electronic components: ● Obtain an ESD protection kit and follow the directions that come with the kit. You can purchase an ESD kit from HP (T99247-A00) or from a local electronics store. Ensure that your ESD wriststrap has a built-in series resistor and that the kit includes an antistatic table mat.
PAGE 9
Figure: Working in an ESD-Protected Environment This figure illustrates how to use an ESD kit when servicing customer-replaceable units (CRUs) and field-replaceable units (FRUs).
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PAGE 11
Figure: Battery Retainer and Screws
PAGE 12
Figure: Fan and Battery Plugs
PAGE 13
Figure: PMCU Faceplate
PAGE 14
Figure: Installing a Fan