Hitachi AMS 2100, Service Manual

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Safety guidelines
Hitachi AMS 2000 Family Storage System Service Guide
Electrical safety
If the system power has been already turned off, verify that these
conditions are satisfied.
ELECTRIC SHOCK HAZARD!
• The power supplies and backup batteries can contain electricity even
when the power is turned off and the units are disconnected from the
electrical supply.
• Disconnect all power before installation.
• Do not disassemble the power supplies or backup batteries.
• Do not touch the electrical connectors on the rear of the power
supplies or backup batteries.
• When replacing power supplies or backup batteries, make certain that
the replacement units are the same model number as the units being
replaced.
• Do not install or remove any ENC or power cables with the power on.
The ENC cables carry a power control signal to the expansion units.
(LAN and Fibre Channel cables can be installed or removed with the
power on.)
• Do not use ungrounded power-extension cables.
• Do not touch any uninsulated conductor or surface that remains
charged for a limited time after the external power supply to the
machine is disconnected.
• When working on a machine that has a grounding terminal, make
sure that the terminals are properly connected to the facility’s
ground.
• Do not work alone when working close to an energized part. Work
with another person who can immediately turn off the power in an
emergency.
• Before starting work, ensure that there are no potential electric
hazards in the maintenance area such as insufficient grounding or a
wet floor.
• Before starting work, note where the emergency power-off switches
are located and make sure you know how to operate them.
• Cut off all power sources to the system before staring work unless
you are instructed not to cut off power. Turning off the machine power
supplies is usually not sufficient. When power is fed from a wall or
floor outlet, unplug the power supply cord, or turn off the switch on
the power distribution panel or board.
• Do not put metallic material, such as a clip or combustible material,
such as paper, into the equipment from the air vent because it will
cause an electric shock or fire.
• Do not use the array in a moist or dusty place because the insulation
can deteriorate. An electric shock or a fire may be caused when the
insulation is deteriorated.
• Before inserting a power plug, ensure that no foreign particles are on
the connectors.
• When the power supply has a lockout device (see the following note),
lock it up after powering off and keep the key. Attach a notice on the
panel or board prohibiting the use of the switch.