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3Bsst & 4Bsst POWER AMPLIFIERS
5
OPERATION contd.
POWER CONTROL
1. Master circuit - breaker.
The SST amplifier uses a magnetic-trip circuit breaker (1) to protect the amplifier.
This switch should be ‘OFF’ during installation. When switched ‘OFF’ all A/C power is
removed from the amplifier, including standby power. The circuit breaker is not the power
switch and should be switched and left ‘ON’ after the installation is complete.Use the
‘SST POWER” switch or an external control voltage to Power-up or Power-down the
amplifier. Should the breaker trip, lower or remove the amplifier input signals. Switch the
breaker to the ‘ON’ position. Then power the unit up normally.
N.B. The circuit breaker must be ‘ON’ at all times for the SST amplifier to operate.
2. AC power input.
On the rear panel is provided a high current plug for the power cord receptacle. Check that the voltage rating on the label
conforms with your locality. With the circuit breaker ‘OFF’ insert the power cord into the SST amplifier, then plug the other
end to an approprate A/C power outlet.
3. Power-Up ( Local / Auto switch. )
A) In “Local” position either the front panel ‘SST POWER” switch or an external voltage con-
trols the power-up of the SST amplifier.
B) “Auto” is used when the SST amplifier is powered from a switched power outlet. The
‘SST POWER’ switch and / or control voltage will function normally.
4. External control voltage power up ( Local / external switch.)
A) To power-up the SST amplifier using an external control voltage and supply a 4v to 12v
(AC or DC) control voltage to the ‘IN’ terminals of connector ( 5 ). Use paired wire of 22 to 18 gage sufficient in
length between the source device and the SST amplifier. (see "Control Voltage Wire Preparation" illustration below
below).
Select switch (4) to “External”. The amplifier will now power-up only when the control voltage is present (on).
Immediately following power up, the control voltage will appear at the ’OUT’ terminals of connector (5) for the
control of other equipment.The removal of the control voltage (0v) causes the amplifier to turn ‘off’ and the con-
trol voltage at the ‘OUT’ terminals is interrupted.
B) In the“Local” setting of switch (4) the SST amplifier will ignore the control voltage, and power up only by using
the front panel ‘SST POWER’ switch, or as in section 3 above. If a control voltage is present at the ‘IN’ terminals
it will still be available at the ‘OUT’ terminals after the power-up sequence.
1/4”
strip
Control voltage wire preparation
for screw terminals
18 to 22
gage
wire
separate 1”
Control Voltage source
4 to 12v ac or dc
Note:
The ‘OUT’ terminals are connected to the ‘IN’ terminals once the SST amplifier has powered-up.
The control current is determined by the source equipment. The carrying current of the ‘OUT’ relay is 2 amps.
The SST control circuitry itself draws less than 2 mA from the control current when operating.
to other voltage controlled devices
4
3
1
2
Bryston part number CO-110A-11104