Protection - Cerwin-Vega CV-5000 User Manual

PROTECTION

The CV-5000 incorporates protection features. The front panel Protection LED indicates the
activity of the relay speaker connection circuitry in each channel. When the Protection LED
turn on, this circuitry is active and all connected speakers are muted.
Initial Power Up - For approximately five seconds after initial power-up, the protection circuitry
is activated and the speaker outputs are muted. If everything is operating normally, you will
hear an audible click at the conclusion of this brief period, as the protection circuitry is
deactivated and the amplifier begins delivering signal to connected speakers. It is normal for
the Protection LED to fade gradually after the amplifier is powered off.
Thermal Protection - Abnormally high heat sink temperatures will engage the Protection
circuitry for the overheating channel only. An output relay disconnects the speakers until
normal temperature range is restored. During this time, the Protect LED will light.
To guard against this problem, make sure the CV-5000 receives adequate ventilation on all
sides and that both the front and rear panels are unobstructed. If the power transformer gets
too hot, its thermal switch will disconnect all of the secondary power and disconnect both
channel outputs.
Short Circuit - If output is shorted due to faulty wiring, the thermal circuitry will automatically
protect the amplifier. If this occurs, the load will be disconnected by the thermal protection
circuitry (also, the output relay opens).
DC Voltage Protection - If an amplifier channel detects DC voltage at the speaker output, the
output relay immediately opens to prevent speaker damage.
Subsonic Frequency Protection - Built-in High Pass Filter provides subsonic frequency
protection for each channel.
Current Limiting Protection - At the amplifier's full power limit, (or clipping point) the limiter
circuitry will be activated. This is indicated by illumination of the Clip LED. The channel gain is
automatically reduced, protecting the speakers from damage. This circuitry may be activated
by uncontrolled feedback, oscillations,or improper equipment gain settings. This circuitry is
virtually transparent in operation, and full signal bandwidth is maintained.
Any time the Protection LED lights up (except for approximately 5 seconds during initial
power-up), there is reason to be concerned. If this occurs, turn the amplifier off immediately
and check carefully all wiring and external equipments in order to locate and correct the
condition.
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