Sonifex S2 - Front Panel Indicators; Fig 3-5: S2-PSUS Front Panel

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S2 User Handbook

POWER SUPPLY

S2-PSUS Dual Power Supply Switcher

The S2-PSUS is a passive power switcher which takes the power feeds from 2 x S2-PSU

units and switches between them in the event of failure. Two trailing leads 0.5 m in length

connect to 2 x S2- PSU units. With LED failure indicators and GPI alarms the S2-PSUS is the

perfect dual redundant power supply module.

Functionality

As an intelligent unit, the S2-PSUS detects changes in the DC levels supplied to the S2.

A failure in any one of the +VD, +VE, -VE or +48V power rails, dened by calibrated limits,

results in switching to the secondary power unit. If the glitch was temporary and the

primary power unit recovers, the S2-PSUS will switch back. Once it has switched back, the

unit has to remain stable for one minute for the power supply to be deemed stable again.

A failure count is incremented every time the unit returns and fails within the minute period.

Once three failures have occurred the rail is no longer used and the unit will only use the

secondary power supply. If the secondary power supply fails, the unit will enter ‘Joint Mode’

and attempt to complete the power rail set from the primary power supply. Again, if the

secondary power supply recovers, it is given a minute to stabilize. Three or more failures

on the same rail will result in a permanent failure to that rail. If the same rail fails in both

supplies, the unit will cut all power to the mixer except in the case of the phantom power

+48V rail.

Front Panel Indicators

Fig 3-5 : S2-PSUS Front Panel.

Two indicator LEDs on the front of the unit are used to display which power supply is

currently supplying the mixer. There are also eight LEDs that display the status for each of

the rails.

The LED will stay illuminated when the rail is stable. If the LED ashes quickly (1/4 second),

then the level is too high on that rail or if the LED ashes slowly (1/2 second), then the level

is too low on that particular rail. If the unit is in ‘Joint Mode’, then both active LEDS will be

on. In this case, if the same rails are good on both, the primary S2-PSU will be supplying the

power for those rails.