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Page 58 of 332
Chapter 3 — System and site requirements
Alternative AC-powered installation
553-3021-209
Standard 3.00
Location of power outlets
The maximum distance between a power outlet and the system chassis
depends on the length of the power cord. In North America, the power cord
is 9 ft 10 in. (3000 mm). In countries outside North America, the power cord
is 8 ft 2 in. (2490 mm).
If a dedicated panel cannot provide optimal conditions, use an Isolation
Transformer with the following characteristics:
•
120/208/240 VAC input, over-current protected at primary
•
120/208/240 VAC available at secondary outputs, each
circuit breaker-protected
•
Completely isolate primary and secondary windings from one another
•
Approved for use locally as a stand-alone user product (CSA, UL, or
other locally recognized clear markings)
•
Capable of providing power to all Option 11C Mini system equipment
operating at the same time at full load
•
Equipment not related to the Option 11C Mini system must not be
powered from a transformer that provides service the Option 11C Mini
system.
Uninterruptible Power Supply
For backup AC power, you can use an Uninterruptible Power Supply (UPS)
to feed the Option 11C Mini. The power requirement for a UPS is 550 VA per
system. The maximum power requirement for a Main Chassis and a Chassis
Expander on the same breaker is 1100 VA. Install the UPS according to the
manufacturer's instructions.
Isolation transformer ground
The transformer ground must have the following characteristics:
•
Separate grounds for primary and secondary windings, rather than a
common ground
•
A "clean" and permanent SPG reference at the transformer secondary for
the Option 11C Mini system
Make sure that the ground conductors inside the transformer are sized
correctly.
April 2000
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