Crown CTs 4200USP/CN Operation Manual page 16

3 Operation
(continued)
2. Hold the Reset/Preset switch in for two fl ashes of the Data light
(longer than 2 seconds).
3. The Data indicator will fl ash rapidly for a moment.
4. Restore the audio input signals.
To restore the unit including presets to factory default
settings:
1. Remove all audio input signals.
2. Hold the Reset/Preset switch while applying power to the unit.
3. The Data and Preset indicator will both light.
4. Release the switch within 5 seconds (before the Data and Pre set
indicators go out).
5. The Data indicator will fl ash rapidly for a moment.
6. Restore the audio input signals.
3.2.10 User Presets
The control settings for all the functions can be stored as presets.
A total of ten presets can be saved in the USP/CN's nonvolatile
memory. Each preset can be named with a 30 character name
describing its function, which is also stored in the USP/CN's
memory.
• The Store Preset Control saves the current setting to the
specifi ed preset.
• The Recall Preset Control recalls the specifi ed preset
set tings.
• The Preset Valid Monitor indicates if a change has been
made to any setting since the last time a preset has be saved or
recalled.
• The Last Stored or Recalled Preset Monitor indicates
what the Last Stored or Recalled preset is.
3.2.11 Clip Event Monitor
A clip detector is provided each channel. These monitors will
indicate any clip condition (> 0.05% distortion) in the amplifi er
channel. The clip detectors also can indicate certain errors (See
Section 3.1.25).
3.2.12 Input Signal Level Monitor
The input signal level of each channel can be monitored via
Sys tem Architect software. The measurement range is from +20
dBu to –40 dBu with 0.5 dBu resolution. Each audio channel has
the following monitors:
• Analog audio input: The audio input at the Balanced Audio
Inputs.
• Switched audio input: The audio input after the Input Audio
Router.
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• CobraNet audio input: The audio input level from the selected
CobraNet audio channel.
3.2.13 Output Signal Level Monitor
The output signal level of each channel can be monitored via
System Architect software. The measurement range is from 0 dB
to –40 dB with 0.5 dB resolution. The monitors are scaled so that
0 dB is referenced to the full rated output voltage of the amplifi er.
3.2.14 Thermal Headroom Level Monitor
The thermal headroom level of each channel can be monitored
with the software. This level represents the percent of available
power/thermal capacity that is currently being used within the
output section of the amplifi er. When the thermal headroom level
reaches 100%, the amplifi er cannot produce any more power and
it will begin to protect the output devices by limiting their drive
level. The thermal limiter feature of the USP/CN can be set to
engage at a pre-selected thermal level. (See Section 3.2.31).
3.2.15 Power/Standby Control
Each channel can be independently turned on and off.
3.2.16 Signal Mute
The output signal of each channel can be independently muted.
This function produces a minimum 60 dB of attenuation.
3.2.17 Polarity Inverter
The input signal polarity of each channel can be independently
inverted.
3.2.18 Input Signal Fader
Each input signal can be adjusted under software control. The
gain range is +20dB to –100dB in 0.5 dB steps. Each analog
Audio Input has two faders with these functions:
• Trim the Analog Audio Input signal before the Input Router.
• Trim the Analog Audio Input signal after the Input Router.
3.2.19 Amplifi er Information
At startup, the module extracts several useful items of informa tion
about the host amplifi er. These include manufacturer, model, date
code, and serial number. This information is stored in the software
system inventory and is displayed on the software con trol panels.
3.2.20 User and Channel Labels
In IQwic, the module can store two user labels and channel labels.
In System Architect, the module can store 4 or 8 channel labels
and a unit label.These labels are 30-character strings that can be
CTs Multi-Channel Power Amplifi ers
set by the user to indicate the function of the amplifi er and its
channels. For example, "LOWER RIGHT CLUSTER, FOR DELAY."
3.2.21 Line Voltage Monitor
The AC line voltage supplied to the amplifi er can be monitored with
this function. If the voltage is out of a safe area you can trigger an
error.
3.2.22 Error Reporting
The module can detect three different error conditions per channel
and errors in the AC line voltage. Each error type can be confi gured
to report the error through the control network and/or the AUX port.
Network reported errors appear in the control software's Error
Win dow.
The software offer many options to further report errors, including
audible alerts, printout, email, pager, serial port and fax. The options
are set in the software. The following describes each error source.
CLIP: The USP/CN can be confi gured to report if an excessive
number of clip events occur in either amplifi er channel. The clip
events are consider an error if they exceed the defi ned count per the
defi ned unit of time. The Count Control sets the maximum number
of events before the error is reported. The range is 1 to 100. The
Time Control defi nes the amount of time that the events are counted
before starting the counting process over. Its range is 1 to 10
seconds. Note: Clip events are defi ned as the start of each clip and
every 10 milliseconds the amplifi er is in clip thereafter. Using a high
count setting with a short time setting may result in clip error never
being detected.
THERMAL: Errors can be generated for excessive temperature in
the output section of the amplifi er channel. The Threshold Control
sets the level that, if exceeded, will generate the error report. This
control has a range of 1 to 100%.
LOAD: If the load monitoring feature is activated, an error report can
be generated if the load impedance moves outside the pre-selected
range. See Section 3.1.33 for instructions on setting up load
monitoring.
LINE VOLTAGE: The AC line voltage can be monitored and an error
generated whenever the voltage is outside of the limits set at the
factory.
Operation Manual