Statement 29
CAUTION:
This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit to the earthing conductor at the equipment. If this
connection is made, all of the following conditions must be met:
v This equipment shall be connected directly to the dc supply system earthing electrode conductor or to a bonding jumper from an earthing terminal bar or bus to which the dc supply system earthing electrode conductor is connected.
v This equipment shall be located in the same immediate area (such as, adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same dc supply circuit and the earthing conductor, and also the point of earthing of the dc system. The dc system shall not be earthed elsewhere.
v The dc supply source shall be located within the same premises as this equipment.
v Switching or disconnecting devices shall not be in the earthed circuit
conductor between the dc source and the point of connection of the earthing electrode conductor.
Statement 34
CAUTION:
To reduce the risk of electric shock or energy hazards:
v This equipment must be installed by trained service personnel in a restricted-access location, as defined by the NEC and IEC 60950-1, First Edition, The Standard for Safety of Information Technology Equipment.
v Connect the equipment to a reliably grounded safety extra low voltage (SELV) source. An SELV source is a secondary circuit that is designed so that normal and single fault conditions do not cause the voltages to exceed a safe level (60 V direct current).
v Incorporate a readily available approved and rated disconnect device in the field wiring.
v See the specifications in the product documentation for the required circuit-breaker rating for branch circuit overcurrent protection.
v Use copper wire conductors only. See the specifications in the product documentation for the required wire size.
v See the specifications in the product documentation for the required torque values for the wiring-terminal nuts.
The dc power supplies are customer replaceable units (CRUs) and do not require preventive maintenance. Use only the supported dc power supplies for the storage subsystem.
Each dc power supply has a built-in sensor that detects the following conditions:
v Over-voltage v Over-current
v Overheated power supply
If any of these conditions occurs, one or both power supplies will shut down. If the power remains off (does not automatically restart), ensure that the environment is optimal (no overheating has occurred, the dc power source is working, and so on). For more information, see “Restoring power after an unexpected shutdown”
on page 98.
If both dc power supplies fail or if the power supplies cannot maintain an internal temperature below 65°C (149°F), the power supplies will automatically shut down (an overtemperature condition). If this occurs, you must cool the storage subsystem and restart it. See “Restoring power after an unexpected shutdown” on page 98.
Attention: The fans in the dc power supplies draw in fresh air and force out hot air. The dc power supplies are hot-swappable and redundant; however, if the fans in one power supply fail, you must replace the entire failed power supply within 72 hours to maintain redundancy and optimum cooling. Do not remove the failed power supply until you have the replacement power supply. When you do remove the failed power supply, be sure to install the second power supply within 10 minutes to prevent any overheating due to the interruption to the air flow that cools the storage subsystem.
Do not run the storage subsystem without adequate ventilation and cooling, because it might cause damage to the internal components and circuitry.
Before you begin, ensure that you wear an anti-static wrist strap.
To replace a dc power supply, complete the following steps.
Attention: To prevent damage to the storage subsystem components from overheating, replace a failed power supply within 10 minutes of removal. If replacing it will take longer than 10 minutes, stop all I/O activity to the storage subsystem and turn off the power until you complete the replacement. Do not remove the failed power supply from the storage enclosure until you:
v Review the replacement procedure in this section.
v Have the replacement power supply and are ready to install it in the enclosure.
(L001)
1. If necessary, use the Storage Manager software to print a storage system profile.
2. Read the safety information that begins on page “Safety” on page ix and “Best practices guidelines” on page 8.
3. Did the Recovery Guru direct you to replace a failed power supply?
v Yes:Go to step 4.
v No:Run the Recovery Guru to identify the failed component, and then go to step 4.
4. Unpack the new dc power supply. Save all packing material in case you have to return the failed power supply.
5. Turn off the power switch on the new unit.
6. Check the fault LED to locate the failed power supply. If a fault is detected, the amber fault LED is lit.
7. Ensure that the OK to remove LED is lit. Do not remove the power supply if the LED is off. For more information about the OK to remove LED, see “OK to remove LED” on page 105.
DANGER
When working on or around the system, observe the following precautions:
Electrical voltage and current from power, telephone, and communication cables are hazardous. To avoid a shock hazard:
v Connect power to this unit only with the provided power cord. Do not use the provided power cord for any other product.
v Do not open or service any power supply assembly.
v Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
v The product might be equipped with multiple power cords. To remove all hazardous voltages, disconnect all power cords.
v Connect all power cords to a properly wired and grounded electrical outlet. Ensure that the outlet supplies proper voltage and phase rotation according to the system rating plate.
v Connect any equipment that will be attached to this product to properly wired outlets.
v When possible, use one hand only to connect or disconnect signal cables.
v Never turn on any equipment when there is evidence of fire, water, or structural damage.
v Disconnect the attached power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures.
v Connect and disconnect cables as described in the following
procedures when installing, moving, or opening covers on this product or attached devices.
To disconnect:
a. Turn off everything (unless instructed otherwise).
b. Remove the power cords from the outlets.
c. Remove the signal cables from the connectors.
d. Remove all cables from the devices.
To connect:
a. Turn off everything (unless instructed otherwise).
b. Attach all cables to the devices.
c. Attach the signal cables to the connectors.
d. Attach the power cords to the outlets.
e. Turn on the devices.
(D005a)
8. Turn off the power switch and disconnect the dc power cable from the failed power supply.
9. Turn off the -48V disconnect device.
10. Remove the dc power supply from the bay
a. Open the two release levers as shown in the illustration. The controller moves out of the bay approximately 0.6 cm (0.25 inch).
b. Slide the dc power supply out of the bay and set it aside.
DANGER
Electrical voltage and current from power cables are hazardous. To avoid a shock hazard, always place electrical equipment on dry, static-free level surfaces. Never turn on any electrical equipment when there is evidence of fire, water, or structural damage.
11. Place the replacement dc power supply on a dry, static-free level surface.
12. Ensure that the release levers on the power supply are in the open position.
13. Slide the dc power supply into the bay until it stops.
14. Push the release levers to the closed position.
15. Connect the dc power cable and turn on the -48 V disconnect device, then;
turn on the power-supply switch.
16. Check the power and fault LEDs on the new unit.
17. According to the status of the power and fault LEDs, use one of the following procedures:
v The fault LED is lit and the dc power in and dc power out power LEDs are off:The new unit might be installed incorrectly. The power-supply switch might not be turned on. The dc power cable might not be fully inserted into the power connector. The disconnect device might be turned off or inoperative. The dc power source might be turned off or inoperative.
The dc power cable might be faulty. Go to step 18.
v The fault and dc power in LEDs are lit but the dc power out LED is off:
The power supply is faulty. Turn off the power switch and contact your IBM technical-support representative for a replacement power supply.
v The dc power in and dc power out LEDs are lit but the fault LED is off:
Go to step 19 on page 142.
18. Perform the following task or tasks to solve the problem:
v Ensure that the power switch is turned to the on position.
v Ensure that there is power at the dc source and no disconnect device has tripped.
Power supply Release
levers
Figure 105. Replacing a power supply
v Ensure that the power cable is working and fully seated into the dc power connector.
v Ensure that the dc power cable is properly connected to the dc power source.
v Reinstall the power supply.
If these tasks do not solve the problem, contact your IBM technical-support representative.
19. Complete any remaining Recovery Guru procedures, if needed.
20. Check the status of each component in the storage subsystem.
21. Are any amber LEDs lit on any of the components?
v Yes :Click Recovery Guru in the Subsystem Management window toolbar and complete the recovery procedure. If a problem is still indicated, contact your IBM technical-support representative.
v No:Go to step 22.
22. Create, save, and print a new storage subsystem profile.