APC AP9606 Specifications download pdf (Page 24)

16 Implementing UPS Configurations with Microsoft Cluster Server

Figure 8. AP9606 — APC Web/SNMP Card

2.3.3 Redundant Switch

The Redundant Switch is a high availability UPS accessory designed to provide

clean, reliable AC power. It provides a seamless transfer to an alternative AC

source when the input is outside the acceptable range. It can withstand zero to

twice the nominal input voltage, while preventing any possibly damaging

transients or gaps in output voltage from reaching the protected equipment.

The Redundant Switch should be used with two identical Smart-UPS models,

thus providing mirrored Smart-UPS protection to your critical loads. The

Redundant Switch transfers the load to the mirrored Smart-UPS unit should the

output voltage from the preferred Smart-UPS unit fall outside the acceptable

range. Transfer of the load to the mirrored UPS happens automatically, ensuring

virtually continuous AC power availability and availability of safe server

shutdown. The Redundant Switch is phase-locked to the utility, and will provide

as seamless a transfer between AC sources as possible.

Figure 9. Redundant Switch

APC has created this cost-effective method to increase the AC power availability

of your protected network equipment. An important advantage of this solution is

that you can feed power to the two Smart-UPS units from two separate AC

circuits, further increasing system availability. This fault-tolerant product

combination allows monitoring and line filtering of these two separate AC sources

up to 3000VA.

UPS 1

Power

Phase A

Phase B

Redundant

Switch

Power

Server

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APC AP9606 Specifications Page 24