Power Amplifiers Types 2716 and 2716-C –
User Manual
20
6.2 Thermal Protection
If the amplifier is driven very hard into a low-impedance load, the temperature will rise. If
these causal conditions continue, the Protection indicator(s) will illuminate, indicating that
the amplifier is about to go into thermal shutdown.
After five seconds, the amplifier will go into thermal protection by muting the input signal.
After some time, the amplifier will have cooled down enough for the amplifier to come out
of shutdown and operate as normal. If the load conditions remain unchanged, the thermal
protection will be reinitiated. Thermal protection starts when the heat sink reaches a temperature
above 90°C.
6.3 VHF Protection
If a signal above 12kHz is detected at the amplifier outputs for more than five seconds at
full output power, the VHF protection mutes the input signal. (This is indicated on the front
panel labelled Protect.) After five seconds, the outputs will un-mute and return to normal
operation, unless the output signal has remained unchanged, in which case the VHF protection
will re-initiate.
6.4 Short-circuit Protection
This amplifier is completely short-circuit protected. The protection circuit permits very high
peak currents, but still holds the output devices within the safe operation area. If a short
circuit is maintained, the channel affected will eventually go into thermal protect cycle until
the short circuit has been removed.
6.5 DC Protection
There are two types of DC protection:
• fuses on the supply branches of each channel
• a DC crowbar-protection that shorts the output if >10 volts DC is detected on the outputs
Both these circuits come into effect once a DC level is detected on either channel.
BE169212.book Page 20 Tuesday, January 23, 2007 9:00 AM
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