Compaq 3000 manual Replacing the UPS, Replacing a Blower

Chapter 3. Installation and Maintenance

3.6.4 Replacing the UPS

Proceed as follows to replace the UPS:

1.Ensure the UPS power switch is set to off.

2.Disconnect the shelf power cords from the rear receptacles on the UPS.

3.Disconnect the UPS power cord from the wall outlet.

4.Disconnect the serial control cable from the controller shelf.

5.Remove the screws that secure the front panel of the UPS to the cabinet.

6.Install the replacement UPS and replace the screws removed in step 5 to se- cure the unit.

7.Reconnect the power cords and the serial control cable.

8.Set the UPS output voltage level to your specific ac power source.

9.Set the UPS power switch to on, set the UPS low-battery warning option to five minutes (refer to UPS manual), and then power-up the shelf.

3.6.5 Replacing a Blower

WARNING

Only qualified service personnel should access the rear of the shelf to replace a blower.

The controller shelf has two blowers mounted on the rear. Connectors on the backplane provide the +12 Vdc to operate the blowers. When a blower fails, the shelf status (amber) LED on the power supply SBB is OFF and an error message is passed to the controller or host via the shelf status signal. The Device I/O as- sembly status LEDs indicate which blower has failed and then automatically switches the remaining blower to high speed. Refer to the SBB I/O Module User’s Guide (Part No.: EK-SBBIO-UG) supplied with the device expansion shelf for additional LED and blower status information.

Use one of the following procedures to replace a blower (see Figure 3–18).

CAUTIONS

The blowers are dual-speed devices and should be replaced only with identical units.

Shelf air flow is lost when a blower is removed. Re- place immediately or damage can result.

EK–SMCPQ–UG. C01 3–33