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Bittner-Audio
BITTNER Installation & Operations Manual
Air Ventilation and Cooling Requirements
The amplifier is equipped with a forced air-cooling system with variable speed and temperature controlled
fans to guarantee low operating temperature and minimal ventilation noise. The series XR amplifiers are
equipped with four electronically controlled fans, two at the front side and two at the rear side. The air flow
takes place from the rear of the amplifier to the front.
Because the XR Series are class H amplifiers, overheating is not an issue under regular conditions. The
amplifier will heat up only slightly even under full power.
In case any heat sink becomes too hot, the temperature sensor opens the respective output relay,
disconnecting the output load from the particular channel. After cooling down to the appropriate operating
temperature the relay contacts are closed again automatically.
It is important to have adequate air ventilation space behind the amplifier to allow a proper air flow. In case
the amplifier is mounted into a closed rack, do not cover the front of the rack with doors. Using racks with a
closed backside, use fans on the rear rack panel (air flow to the inside of the rack).
Power Connection
The power amplifier must be connected only with the attached three-wire
safety power cord with protective conductor (non-fused earthed
conductor). This amplifier is made for use with the mains voltage labeled
on the back of the amplifier only.
Check the label on the back panel of the amplifier for the appropriate
voltage. The voltage version of the amplifier is preset and cannot be
changed. Make sure the voltage of your mains outlet is correct. Damage
caused by connecting the amplifier to improper AC voltage voids the
warranty.
The power fuses are located on the back panel of the amplifier and can be
accessed from the outside. Use only the appropriate fuses as labeled.
After properly mounting and connecting the AC cord and the audio
connections, the unit can be switched on. The POWER indication LED
indicates that the amplifier has been turned on.
LED Indicators
The amplifier is equipped with the following LEDs on the front panel:
LED
C
OLOR
F
UNCTION
ONLINE
green
Indicates that the unit is connected to an SXL unit or via RS485 network
STANDBY
yellow
In control mode (SXL, RS-485, RemoteControl Voltage) this LED
indicates that amplifier is in standby mode (power switched off). Manual
power switch overrides this seting. When standby mode is overriden
manually, both STANDBY and POWER leds are ON.
POWER CH1
Green
Indicates that amplifier channel 1 is powered up.
CLIP CH1
Red
Indicates that the input is overloaded. The LED starts illuminating as
soon as the signal is 0.5 dB under full power.
SIGNAL CH1
Green
Indicates, that signal reaches the output stage of the amplifier.
PROTECT CH1
Red
This LED will light up as soon a protection circuit has been activated or
if one of the output relays has been activated. When the amplifier is
switched on, this LED illuminated for approximately 1.5 seconds.
POWER CH2
Green
Indicates that amplifier channel 2 is powered up.
CLIP CH2
Red
Indicates that the input is overloaded. The LED starts illuminating as
soon as the signal is 0.5 dB under full power.
SIGNAL CH2
Green
Indicates that signal reaches the output stage of the amplifier.
PROTECT CH2
Red
This LED will light up as soon a protection circuit has been activated or
if one of the output relays has been activated. When the amplifier is
switched on, this LED illuminated for approximately 1.5 seconds.