High Frequency Protection - Camco Q-POWER 14 User Manual

7

7.1.9 High Frequency Protection

All outputs are permanently monitored for high-frequency high output signals.
Continous output of 22 kHz sine-wave signals at full scale is permissible, but
higher frequencies at very high output levels might trigger this protection.
If detected, the corresponding amplifier module will be switched off for a few
seconds and restarted again.
7.2 Mains and Power Supply Protections
7.2.1 Inrush Current Limitation
Within 7 seconds of the amplifier being switched on, the inrush current limiter will
increase mains current from nearly zero to nominal value. This value depends on
program material, output level and speaker loads.
7.2.2 Mains Overvoltage Detection
Mains over voltage detection is always operative. When the mains voltage
exceeds approx. 280 V (ROW range) or 180 V (America and Japan range), the
amplifier will be switched off. The system will try to restart in intervals and will
return with a soft start when the regular mains voltage returns.
7.2.3 Mains Surge Overvoltage Protection
The Q-POWER 14 is fitted with a varistor unit, protecting the SMPS from sporadic
surge overvoltages coming from the mains distribution.
7.2.4 Mains Failure Detection
Mains failure detection is always operative. When the mains supply is interrupted
for more than 5 mains cycles, the amplifier will be switched off.
Shorter or equal dropouts will be ignored and the amplifier will continue to deliver
music out of the amplifier's internal capacitors (acting as enrergy reservoir). With
this feature it's possible to continue to deliver music at 1/8th output power during
mains dropouts as long as 100 ms!
In case the amplifier has been switched off it will return with a soft start when the
regular mains voltage returns.
2 2 / 4 2 www.camcoaudio.com
Q - P O W E R 14
P R O T E C T I O N S
7.2.5 Mains Overcurrent Limiter
The mains input current is continously monitored and will be limied to maximum
values of 75 A / 106 A (in ROW range) or 106 A
RMS Peak
and Japan range).
7.2.6 Over Current Protection
All internal SMPS currents are continuously monitored. If an overcurrent situation
occurs, the main SMPS immediately stops working. Should there be an internal
failure, this feature prevents other parts from being damaged.
7.2.7 Fuse / MCB Protection (FuseProtect™ Limiter)
When driving the Q-POWER 14 at very high output levels over a longer period
of time (i.e. several seconds and minutes) the average mains current draw can
become very high. In such situations, the FuseProtect™ limiter will reduce the
output signal in order to prevent the external mains breaker from tripping. On the
other hand, this limiter will not affect the output level for dynamic music signals,
thus still guaranteeing the full available peak output power.
Please note that the FuseProtect™ limiter only controls the average mains input
current, not the short term peak input current. This means that with very dynamic
music signals the (short term) input current can still reach very high levels, which
can be very demanding for a mains distribution.
7.2.8 Thermal Protection
The temperatures of all power supply heatsinks and main transformers are per-
manently monitored. In case of excessive heating due to an internal failure the
main SMPS will switch off immediately to avoid any further damage.
P O W E R A M P L I F I E R
|
/ 150 A (in America
RMS Peak
à See also chapter 3.7
U S E R M A N U A L