Liebert STS2, PDUTM manual Frame and Enclosure, Caster and Leveling 250A only, Cooling, Frame sizes

Specifications

14.2.1Frame and Enclosure

The complete STS2/PDU is housed in a freestanding enclosure. The cabinet is a NEMA type 1 enclo- sure. The cabinet is structurally designed to handle lifting from the base. The frame is designed to accommodate floor stands.

Table 25 Frame sizes

Rating	Width x Depth x Height
	in. (mm)
250A	60 x 32 x 77 (152 x 81 x 196)*
400 – 600A	73 x 49 x 77 (186 x 125 x 196)
800A	96 x 49 x 77 (244 x 125 x 196)

* Width is 76.8 in (195 cm) with output distribution cabinet

The distributed floor weight for STS2/PDU is less than 260 lbs./sq. ft. (118 kg/m²).

The required service access is front and one side of the unit, 250A without output cabinet is front access only. Side access depends on which side the output cabinet is mounted, can be left or right.

The STS2/PDU can be tipped 15° in any direction without falling over.

14.2.2Caster and Leveling - 250A only

The 250A unit frame includes heavy-duty swivel casters for ease of installation, plus permanent level- ing feet for final installation.

14.2.3Cooling

The STS2/PDU 250A units utilize convection air cooling for the enclosure with forced air cooling of the heat sinks.

The 400-800A units are fan cooled using low-velocity fans to minimize audible noise. All fans are redundant so that a single fan failure cannot cause temperatures to increase beyond acceptable lim- its.

Air intake is through screened protective openings in the front of the unit. A standard furnace filter is installed behind the openings.

By opening the front door, the filter can be changed easily without exposing personnel to high voltage. The size of the filter is 1 in. x 25 in. x 25 in. (2.54 cm x 63.5 cm x 63.5 cm).

The air exhaust is through the top of the unit.

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