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Introduction
WARNING: THIS APPARATUS MUST BE EARTHED
The CPS2000 is a linear power supply which, like other linear supplies, produces DC
voltages by rectifying, smoothing and regulating AC voltages from the secondary
windings of a mains transformer. Soundcraft mixing consoles employ a number of
dc voltage supply levels in their operation and these are all provided at the output of
each supply unit.
In regulating these voltages there is considerable heat generated, the dissipation of
which is achieved through a substantial heat sink on each side of the unit. Two fans
are incorporated which draw air over the heatsinks to provide adequate heat dissipation
for the regulators and reduce the outer case temperature.
The CPS2000 is designed for installation in a 19" rack unit, occupying 4U of rack
height. Refer to the section "RECOMMENDATIONS FOR INSTALLATION" on
Page 7.
LEDs are provided on the front panel to show the operation of the regulating circuits,
and a digital voltmeter monitors the mains supply voltage.
The CPS2000 may be linked to a second CPS2000 to provide automatic power backup
in the event of one of the units failing.
MAINS VOLTAGE SELECTION.
Special attention should be paid to the following information:
Do not change the voltage setting without first turning
the unit off and unplugging the mains lead. Ensure that
the cover plate over the mains voltage selection
switches is replaced after correct voltage selection
has been made and that the cover plate is positioned
to show the correct mains voltage.
This unit is capable of operating over a wide range of mains voltages by means of a
comprehensive set of selectable voltage settings. It is important to ensure that the
correct voltage setting has been selected for the level of local mains voltage supply,
for safe, uninterrupted operation of the unit.
There are two mains voltage selection switches behind a cover plate on the front of
the unit. Voltage selection is achieved by moving the switches using a screwdriver
blade, into the correct positions, as shown by the symbols marked on the front panel.
In this way the unit is set up for operation at one of the following ranges of mains
supply:
NOMINAL VOLTAGE OPERATING VOLTAGE RANGE
Vrms AC Vrms AC
230 195-253
200 170-220
115 98-126
100 85-110
Introduction 3