Calrec S2 Operator's Manual page 55

S2
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3.9 POWER SYSTEM
The console is designed to operate with the following power supplies:
-16A/CR/+16A
8L/0L
48V/CR
The +16A is used internally in the modules to derive +10V and -10V stabilised reference
voltages and also +5A (and sometimes -1A or -2A) for CMOS analogue switches.
The 8L is internally stabilised to 5L for logic circuits.
Power supply units each provide all 3 supplies simultaneously in the correct proportions
i.e.
-16A/CR/+16A
8L/0L
48V/CR
These supplies are isolated and diode protected so that they can be parallelled and CR,
0L grounded at the console. Each power supply is connected to the console DC interface
by a multicore cable and heavy duty 19-pin plugs and sockets.
Each supply in each power unit is separately monitored and provided all 3 are intact in a
given unit a monitor line to the console in the DC connecting cable is energised.
All power supply monitor lines are brought together at the power supply interface unit such
that if any section of any power supply unit fails, a PSU FAIL lamp flashes. This may be
cancelled to avoid irritation but will resume flashing if another section fails or when the desk
is switched off and on again.
The power supply units will operate correctly at 10% below normal mains voltage.
3.10 POWER CONSUMPTION
It is usual to provide spare capacity when the choice of the number of power supply units
is made to allow for a failure without affecting performance. This is known as a "hot spare".
It also helps to share the load and keep the power supply units running at a reasonable
temperature. Generally the number of power supply units provided and the power
consumption is approximately as follows:
Console No. of PSU's
24ch 3
36ch 4
36ch with m'trk 5
48ch 5
48ch with m'trk 6
60ch 6
60ch with m'trk 7
72ch 7
72ch with m'trk 8
analogue power
logic power
microphone phantom power
at 5 amps.
at 5 amps.
at 0.3 amp.
Audio Amps Logic Amps
7.5 3
12 5
14 7
16.5 8
18 10
21 11
25 15
27 16
31 20
Mains loading
750W
900W
1100W
1200W
1400W
1500W
1700W
1800W
2000W
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