Studer SW V4.0 OnAir 1000 Operating And Service Instructions page 132

OnAir 1000 Digital Mixing Console
Internal Fuses
Alarm Output
14-4 Wiring and Hardware
ferent phases of the mains), two mains switches, two primary power sup-
plies, two separate DC cables to the console, and two separate secondary
DC-DC converters within the console.
The primary AC/DC converters are contained in an external 19" rack
mount case. On the front panel two mains switches are fitted, together with
LED indicators for both 24 V voltages and an eventual power alarm. On
the rear side two connectors are available for the mains inlet, and two con-
nectors where the supply cables to the console can be attached. The 19"
case is equipped with a very low noise fan.
The OnAir 1000 versions with fully redundant power supplies use the
existing 24 V connector at the rear panel for one of the supply cables. In
DC
place of the mains inlet connector of the standard versions there is a sec-
ond 24 V connector for the second cable. The cable harness and the de-
DC
coupling PCB inside the console are different from the ones of the stan-
dard versions, too.
OnAir 1000 Console
(71.129.441.10 / 71.129.443.10)
Sec. Switcher A
(Power Supply,
1.942.605.xx)
24 V A
Supply
Cable A
Redundancy PSU
(1.918.225.xx)
Primary
Switcher A
Power
Switch A
Mains Inlet A
The OnAir 1000 consoles with fully redundant power supply are delivered
under two different order numbers (see below) and come complete with
the 19" Redundancy PSU. However, the cables have to be ordered sepa-
rately, depending on the required cable length (two cables required per
console).
There are two fuses (T 8.0 A H 250 V UL/CSA) located on the Sub
Board 2 (1.942.607.xx) within the console. In case of failure, these fuses
must be replaced by spare fuses of exactly the same type and value.
Power alarm is triggered if one of the external supply voltages drops below
23.0 V or if one of the internal supply voltages fails. The "POWER FAIL"
LED on the console is illuminated; in addition, the power alarm signal is
SW V 4.0
Console
Supply
Sec. Switcher B
Voltage Control
(Subboard 2 for PSU,
1.942.607.xx)
Power
Fail
24 V B
Supply
Cable B
Power
Alarm
Connection
(Subboard 2 × 24V,
1.918.226.xx)
24 V A 24 V B
ON ON
(Power Supply,
1.942.605.xx)
Primary
Switcher B
Power
Switch B
Mains Inlet B
Date printed: 23.10.03