Digital Equipment RW504-ZA, Руководство по обслуживанию

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2.6.4.1 Changing the Voltage Configuration
CAUTION
Do not switch off power to any peripheral on the SCSI bus without first
checking that the bus is inactive.
Switching off power to a peripheral on an active bus may cause data loss,
indeterminite bus states, or both.
1. Remove power from the autochanger.
a. Press the operation switch (located on the front panel) so that it is in the
‘‘OFF’’ position.
b. Press the power switch (located on the rear panel) so that it is in the
‘‘OFF’’ position.
c. Disconnect the power cable.
2. Set the voltage select switch to the correct setting.
a. Locate the voltage select switch on the rear panel of the autochanger.
b. If the voltage switch setting is incorrect, change it by sliding the voltage
select switch sideways using a flat-blade screwdriver.
2.6.5 Connecting an Uninterruptible Power Supply (UPS)
To fully protect against data loss in the event of a power failure, Digital
recommends the use of an uninterruptable power supply (UPS). The UPS
can be connected directly to the disk library or it can be a central UPS used by
the entire computer system.
If a power failure occurs during a write operation, the UPS will continue to
supply power to the auto changer/computer system until the data in the optical
drive’s buffer can be written to an optical disk.
For the best protection, the customer should choose the type of UPS that provides
a communication link between the UPS and the autochanger/computer system.
With this type of connection, the computer system/autochanger senses when
power is being supplied by the UPS. Any data currently in the buffer is written
to the disk, and no additional commands are accepted until regular power is
restored.
2–10 Environmental/Installation/PM