Snell Sirius 830 - Power Supply Shelf

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Sirius 800 www.snellgroup.com Power Supplies

3.4 Power Supply Shelf

A single Power Supply Shelf is a separate 2RU assembly which contains up to four sealed

power supply units (see Fig 3.). The power supply units are self-contained and do not contain

any serviceable components. The power supply shelf is rack-mountable and can be placed

above, below or remote from the Sirius frame.

The power supply shelf has auto-sensing inputs, which accept input voltages of between

100 V AC and 240 V AC at 50/60 Hz. Each power supply unit has an independent PowerCon

AC input socket.

The AC input of each power supply unit is rated up to a maximum of 25 A. This assumes the

power supply units are running at their maximum power. Any cables used must be rated

above the rating of the circuit breaker with a suggested rating of 25 A.

The power supply shelf outputs 48 V DC and the power supply units current-share on the

output. Each power supply shelf has three 48 V DC connectors at the rear but only two are

used (see Fig 4.). The power supply shelf can generate alarm signals to indicate presence

and output status.

Caution

• Ensure that the power supply shelves are correctly earthed see section 2.7 for

details.

• The power supply units contain dangerous high voltages and are NOT

user-serviceable.

• The DC leads connecting the power supply shelf to the router are capable of

supplying very high electric current. Do not short circuit.

• The power supply shelf has a protective metal mesh cover over the front of the

individual power supply units, this should only be removed by a qualified engineer.

See section 4.3 for details on replacing power supply units.

• There is one spare DC connector on each power supply shelf and up to four on the

Sirius 800 router frame. Do not remove the covers of the unused connectors.

Fig 3. Front View of the Power Supply Shelf (with and without the Protective Cover)

• Do not obstruct the air vents situated on both sides of the power supply shelf, and

allow a minimum of 50 mm (2 inches) clearance to allow air flow. The air that is

exhausted from the sides must be able to flow past the rear of the power supply

shelf without being obstructed.

• The power supply unit is heavy weighing 24 Kg (53 lbs). When lifting use the

correct local Health and Safety lifting guidelines.

Power Supply

Shelf with

protective Cover

Individual Power

Supply Units (with

protective mesh

cover removed)