Hoellstern DELTA 12.2, Руководство пользователя

Страница: 19 / 24

7. Indicators and Controls
7.1 Gain Controls
Each amplifier channel has its own gain control on the front panel. In bridge/mono mode the C2 or C4 control has no
effect on the gain. The gain controls are controlled and analysed by microprocessors. A change in the position will
only be taken over with a short delay. Always let the rotary knob perceptibly latch in the desired position (21
positions). In-between positions are not permitted and useless. The first three positions counterclockwise from right-
hand stop are equivalent to 0 dB attenuation, i.e. the basic gain (see 26 dB / 32 dB selector switch on the rear side) is
active. Every other position counterclockwise will reduce the gain. The left-hand stop is equivalent to mute (100 dB
attenuation).
7.2 LED Indicators
ON-STBY Green flashing: The amplifier is connected to a mains outlet and switched to
standby mode.
Green on: The amplifier is connected to a mains outlet and the amplifier
module is active (ON).
.
SIG Green on: A signal is present at the corresponding XLR audio input.
The display is filtered and reacts with a delay.
- 6, -3, 0 dB Level meter of the corresponding channels. The detection of the 0 dB full drive mark is done
without filtering and very precise. If the 0 dB peak value is exceeded for more than 10 µsec, this
will be digitally cached and indicated delayed on the display for one second. Compared to all
conventional analogue 0 dB meters, this 0 dB reading is much more sensitive and precise.
LIMIT Red on: The signal limiter is active. The gain of the corresponding channel is reduced.
With the limiting function active, a channel continues to amplify linearly without
any compression of the audio signal.
Indicates AC mains overload: As soon as the internal intelligent mains control recognises a
potential mains fuse overload, the limiters on all four channels will respond at once and the gain is
reduced. All four Limit LEDs will be lit. The typical current limit values of 16A automatic mains cut-
outs (class B) will be observed.
HFLF Red on: A low frequency and / or high frequency audio signal with an excessive level is
present at the output. To protect the loudspeakers the level is limited at the
output. If a limit value is exceeded after a short waiting time despite active
limiting, the module will turn off completely for safety reasons.
TEMP TEMPERATURE
Red flashing: The corresponding module has reached a critical heatsink temperature and
the gain is reduced.
Red on: The heat sink temperature has further gone up despite level limiting and the
corresponding amplifier module switches to standby mode. After the heat sink
has cooled down, the module will automatically turn on again. Troubleshooting:
See chapters on filter cleaning, ventilation and mounting into 19” racks and
equipment cabinets.
CUR CURRENT
Red on: The output current of the amplifier module was exceeded. The module will switch
to standby for about 200 ms and then turn on again automatically. This procedure
may be repeated up to 4 times. If overcurrent should still persist, the amplifier
module will remain in standby mode. A quick OFF - ON using the standby switch
on the front panel – wait a few seconds – will allow another power-up of the
amplifier. Troubleshooting: Check all output channel assignments, check all
connected cables and loudspeakers and correct them, if necessary. See also
chapter on configuration.
MISC MISCELLANEOUS
Yellow on: Bridge mode active (Bridge switch in upper position).
Off: Stereo mode active (Bridge switch in lower position).
Flashing: The internal diagnose functions have detected an internal failure. The unit must
be returned to the manufacturer for service. Please contact ASID GmbH.
Page 17 of 20