APC AP9621 User Manual download pdf (Page 14)

CHAPTER 3: INSTALLATION

Using the Step-Down Transformer

•

Connect the Step-Down Transformer to a UPS for continuous power during a utility

power failure.

• The transformer has an efficiency of 90%. This requires 5500 VA for a 5000 VA load, 5000 VA

for a 4500 VA load, and 3900 VA for a 3500 VA load. Be careful not to overload your branch

circuit or UPS.

• For the AP9621 and SYTF2 models to output the full 5000 VA, the input must be hardwired

to a 5500 VA source.

• Operating the Step-Down Transformer below its specified input voltage range may cause it

to overload and shut down to prevent it from over-heating. When connecting directly to a

branch circuit, ensure that the line voltage is within specification. When connecting to a UPS,

ensure that the line voltage into the UPS is within specification before transferring to bypass.

• Operating the Step-Down Transformer above its input voltage range may cause equipment

damage.

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APC AP9621 User Manual Page 14