Operation Manual
2. Introduction
C SERIES Operation Manual rev 2.0.0
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Following are short descriptions of standard built-in C Series protection features:
• CPL (Current Peak Limiter) ensures that the amplier’s output does not exceed the safe current handling
parameters of amplier components.
• Temperature protection ensures that the amplier will not be damaged by exceeding thermal limits.
• PAL (Power Average Limiter) limits the maximum average power consumption according to the power supply
and mains-breaker capabilities.
• VHF (Very High Frequency) protection circuits mute the output of the amplier when nondynamic continuous
signals above 10 kHz are detected.
• DC protection ensures destructive DC signals will not appear at the amplier outputs. If such conditions occur
an internal fuse opens and fault indication is displayed.
• Low-impedance (short circuit) protection provides a fault warning indication and shuts down the output stage
when, for example, an input signal is present and a malfunctioning cable or driver is short circuiting the output.
• High-impedance warning reports an alert when, at the same time, output signal is high and no current draw is
measured. This situation might occur when no speakers are connected, or when a driver is blown.
• Low inrush current ensures that the mains breaker will not trip when several power ampliers are turned on
simultaneously.
2.2.5. GPIO facilities an 35 Hz HPF
LAB GRUPPEN C…X ampliers offer two features that provide greater exibility and reliability in xed installations:
GPIO (General Purpose Input / Output) facilities and a 35 Hz high-pass lter.
The GPIO connections allow seamless interfacing with many third-party control and power sequencing systems. In
combination with the rear panel DIP-switch, the GPIO connections allow change-of-state power toggling from two
inputs (each closure toggles on-to-off or off-to- on), or same-state on/off from a single input (closed = on and
open = off). A second DIP-switch disables the power on/off commands from the NomadLink network, allowing
only GPI contact closures to trigger power on/off commands.
The 35 Hz high-pass lter rolls off low frequencies (6 dB/octave) for greater efciency and reliability in, for example,
70/100 V high impedance systems where the removal of very low frequency content may be desired.
2.2.6. NomadLink / Ethernet control and monitoring network
The NomadLink network allows easy setup and control of C Series power ampliers. The patented network
topology allows automatic detection and addressing of multiple ampliers. Control is via a PC running
DeviceControl software, which is connected to the NLB 60E NomadLink Bridge & Network Controller using
standard TCP/IP communication. Phantom powering through the standard Cat-5 network cables allows the
software to detect devices that are not currently turned on or connected to the mains. This ensures very high
reliability and redundancy levels while allowing connected ampliers to remain on standby with no power
consumption.
Cat-5 cable connections can be daisy-chained for easy system setup. There is no need to create a star topology
using many switches as with, for example, an Ethernet system. Individual amplier addresses do not need to be
manually entered: you will automatically know where an individual amplier resides in the network. This reduces
total component costs, simplies installation, and makes daily operation more convenient.