Bryston 9BSST owner manual figure W, AC power input, Power-Up Local / Auto switch

9BSST FIVE CHANNEL POWER AMPLIFIER

REAR POWER ENTRY PANEL 1. Master circuit - breaker.

The 9BSST uses a magnetic-trip circuit breaker (1) to protect the amplifier. This switch should be ‘OFF’ when installing the 9BSST. When switched ‘OFF’ all A/C power is removed from the amplifier, including standby power.

The circuit breaker is not the day to day power switch and should be switched and left ‘ON’ after the installation is complete.Use the ‘ST 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. The circuit breaker must be ‘ON’ at all times for the 9BSST to operate.

2. AC power input.

This is a high current plug for the power cord receptacle. Check that the voltage rating at the right of the connector conforms with your locality. With the circuit breaker ‘OFF’ insert the power cord into the 9BSST, 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 ‘ST POWER” switch or an external voltage controls the power-up of the 9BSST.

B. “Auto” is used when the 9BSST is powered from a switched power outlet. The ‘ST POWER’ switch and / or control voltage will function normally after the initial power up.

4.External control voltage power up ( Local / external switch.) A. To power-up the 9BSST using an external control voltage,

Supply a 4v to 12v A/C or DC control voltage to the ‘IN’ terminals of connector ( 5 ).

Use paired wire of 22 gauge to 18 gauge sufficient in length between the source device and the 9BSST. (see ‘W’ ) 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 9BSST to turn ‘off’ and the control voltage at the ‘OUT’ terminals is interrupted.

B. In the“Local” setting of switch (4) the 9BSST will ignore the control voltage, and power up only by using the front panel ‘ST 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.

to other voltage controlled devices	figure W
	Control voltage wire preparation
	for screw terminal connector
	separate 1”

1/4”	18 to 22
strip	gauge
CONTROL VOLTAGE SOURCE	wire

Note:

The ‘OUT’ terminals are connected to the ‘IN’ terminals once the 9BSST has powered-up.

The control current is determined by the source equipment. The carrying current of the ‘OUT’ relay is 2 amps. The 9BSST itself draws less than 2 mA from the control current when operating.

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