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Failover is triggered by any of the following conditions:
•
Chassis Fault
•
Channel Fault
•
Loss of power
•
Loss of CobraNet link
•
Loss of Failover Link Cable
•
ELD-1 / speaker line Fault (if enabled in software)
•
External amplifier Faults being asserted
Only Chassis and Channel Faults trigger the Device failover mechanism. Abnormal conditions that do not
immediately impair audio will appear as warnings but will not trigger failover.
The redundant amplifier may be wired in parallel to the existing speaker line or it can be connected to a
redundant speaker line. Relays isolate the output terminals on the secondary amplifier unit. Relays are
normally open. When a configuration is received, relays close on the primary unit and remain open on the
redundant unit. On failover, the relay states are reversed.
After a failover condition has been asserted, a power cycle of the units is required to recover from the
failover. This can be done either by physically repowering the devices or by performing a 'Device Reset'
in the Vocia software via the Test tab of the device dialog. The units are required to be reset within 10
seconds of each other in order to ensure the primary device resumes control.
Channel-to-Channel Failover
All amplifiers support channel-to-channel failover. This is configured in the Vocia software in the
amplifiers general setting as 1:1 Failover. In this configuration, channel pairs can be specified and
adjacent channels will act as a redundant backup. Channel 2 will act as backup for channel 1. For the VA-
4030 and VA-4030e models, channel 4 will act as backup for channel 3. Additionally the VA-4030 and
VA-4030e amplifiers support 3:1 channel redundancy. This is configured in the Vocia software in the
amplifiers general setting as 3:1 failover. In this configuration channel 4 will act as a redundant backup for
channel 1, 2 or 3.
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