American Power Conversion Smart-UPS - Manual (Page 22)

16 Smart-UPS® VT ISX 20-30 kVA, 200 V Operation 990-2818A
Configuration
Connection of Load to the PDU
At the rear, the UPS contains one Power Distribution Unit (PDU). The PDU has three separate
sections: a, b and c; a is the top section, b is the middle section, and c is the bottom section. PDU
sections a, b and c each contain 6 receptacles with 2-pole breakers.
The 6 outlets of section a are connected to isolation transformer phase leg 1  (labeled U, NU and X
on the PDU). The 6 outlets of section b are connected to isolation transformer phase leg 2  (labeled
V, NV and Y on the PDU). The 6 outlets of section c are connected to isolation transformer leg 3 
(labeled W, NW and Z on the PDU).
The top 2 receptacles in each PDU section are labeled 1 and 2. They are 100 V / 30 A receptacles and
are controlled and protected by breaker sets labeled 1 and 2. The middle two receptacles are labeled 3
and 4. They are 100 V / 20 A receptacles and are controlled and protected by the breaker sets labeled
3 and 4. The bottom two receptacles are labeled 5 and 6. They are 200 V / 30 A receptacles and are
controlled and protected by breaker sets labeled 5 and 6.
Connecting the load to the PDU
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Note
Connect the load equipment evenly between the 3-phase legs of the isolation
transformer by using receptacles from both sections A, B and C. The total output
capacity of the PDU is approximately twice the output capability of the UPS. This
means that UPS would be over-loaded if all PDU outlets were loaded to their rating.
Load status on the individual phases can be found through the UPS display or through
the web interface.
Note
Equipment connected to the 3-phased output may require overcurrent protection with a
lower rating than the 3-phased output.