MM
™
-8802 User Manual
Page 38
http://aa.peavey.com copyright 2001 All Rights Reserved
Fault Contacts
One of the new features of the MM-8802 is the Fault Contact connector. This rear-panel connector gives the designer the abili-
ty to create external monitoring systems that could be used to generate an alarm, or signal other remote systems in case of fail-
ure. This feature works very well for mission-critical environments where systems must be supervised for proper operation.
The Fault Contact connector is a separate, 3-pin, removable Euro connector. The contacts
are rated at 0.3 amps at 120 VAC, (0.3A at 110 V DC, 1A at 30 V DC), and are attached to a
latching relay that provides a Normally Open (N.O.), labeled
Fault Closed
, and Normally
Closed (N.C.),
Fault Open
, contact. Both contacts can be used simultaneously if desired,
and both indicate identical fault functions.
Proper use of these contacts may require that external relays and other electronics be used
to provide signalling and alarm annunciation. Although the current rating of the contacts
is sufficient for direct connection to most common devices, good design would suggest an
intermediate logic stage with its own supervision be implemented for most systems.
The Fault Contact function will activate when any of the following conditions exist within the MM-8802:
Essentially, the fault monitoring functionality is limited to conditions specific to the MM-8802. To correctly supervise an inte-
grated system, fault monitoring should be implemented on each hardware component separately. MediaMatrix software pro-
vides many additional features that can be used to provide supervision functionality. For more information on these features,
please refer to the documentation in the Help of the MediaMatrix or X-Frame
™
88 software applications.
There has been a failure of one or more DC voltage rails within the MM-8802. This includes both analog and digital DC
power supply rails.
The internal temperature of the MM-8802 has exceeded the threshold of normal operation. This fault condition could be an
indication of a defective fan or clogged airway.
There has been a failure, reset, crash or shutdown of the MM-8802’s internal microprocessor.
The integrity of the AC power supply. In most conditions, an abnormal AC power supply condition will be signalled as a
fault by the subsequent fault of the DC supply rails.
Communications between the MM-8802 and the digital audio processor. Communications errors are commonly reported by
the MediaMatrix software.
Audio levels, faults or status.
DSP faults. Since all DSP hardware resides on the DPU product, the faults are reported by the DSP hardware.
Windows faults
System crashes
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N.O. Normally, under no fault conditions, open. Fault Closed
N.C. Normally, under no fault conditions, closed. Fault Open