Appendix D: The Servo Amplifier Protection Circuitry

As noted in the “Guided Tour” section of this manual, the Servo Amplifier's front panel Protection light indicates the activity of the relay speaker connection circuitry. When the Protection light is lit, this circuitry is inactive, and all

connected speakers are muted (provided with 0 volts DC), thus protecting them

PROTECTION

 

and preventing any audible “thump” from occurring.

 

The following conditions will cause the Protection light to go on:

 

• Initial power-up:For approximately five seconds after initial power-up, the

 

relay speaker connection circuitry is deactivated and the speaker output is

 

muted. If everything is operating normally, you will hear an audible click at the

 

conclusion of this brief period, as the circuitry is activated and the Servo

 

Amplifier begins delivering signal to connected speakers. It is normal for the

 

Protection light to fade gradually after the amplifier is powered off.

 

WARNING: If the Protection light fails to go out (and you fail to hear the accompanying audible click) approximately five seconds after power-up, turn the Servo Amplifier off immediately and check all external devices and wiring for possible shorts or other defects.

•Overheating: A temperature sensing device in the Servo Amplifier will cause the relay speaker connection circuitry to be deactivated (and the Protection light to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the Servo Amplifier receives adequate ventilation on all sides (see page 7 for more information); in extreme environmental conditions, you may also want to consider the use of cooling fans.

•Severe overcurrent conditions: This occurs whenever the signal being input to the Servo Amplifier rises to a level above 20% THD (Total Harmonic Distortion).

•Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the Servo Amplifier short one another.

•Output impedance drops below 2 ohms: This can occur if the Servo Amplifier is connected to inappropriate speaker systems (see the “Setting Up and Using the Servo Amplifier” section in this manual for more information).

•DC voltage detected at speaker output: The most likely cause of this is an internal failure.

In general, any time the Protection light goes on (other than during the approximately five seconds following initial power-up), there is reason to be concerned. If this occurs, turn the Servo Amplifier off immediately and carefully check all wiring and external devices in order to locate and correct the condition that caused the light to go on in the first place.

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Samson 170 owner manual Appendix D The Servo Amplifier Protection Circuitry
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170 specifications

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