SSI America EPS2U manual Airflow Requirements, Temperature Requirements, Recommended

SSI

EPS2U Power Supply Design Guide, V2.1

4.1Airflow Requirements

STATUS

Recommended

The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During low-speed fan operation, the power supply must not exceed a noise level of 43 dBa measured at one meter on all faces. At low fan speed, the power supply shall provide a minimum of 12 CFM of airflow with 0.003 inH2O of system backpressure. At high fan speed, the power supply shall provide a minimum of 20 CFM with 0.006 inH2O of system backpressure.

4.2Temperature Requirements

STATUS

Recommended

The power supply shall operate within all specified limits over the Top temperature range. The average air temperature difference (∆Tps ) from the inlet to the outlet of the power supply shall not exceed the values shown below in Table 1. All airflow shall pass through the power supply and not over the exterior surfaces of the power supply.

Table 1: Thermal Requirements

ITEM	DESCRIPTION	MIN	MAX	UNITS
Top	Operating temperature range.	0	50	°C
Tnon-op	Non-operating temperature range.	-40	70	°C

The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power supply with exception of the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short periods of time only”.

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