VFOM-1 Rear
Rear Panel Connections
The rear panel of the VFOM-1 has four 4
–way connectors, each of which provides connections for two
speaker circuits.
The connector numbers correspond to the AM-600 amplifier channel of that number (refer to the amplifier
channel numbers printed above the AM-600 amplifier modules on the VA-8600 rear panel).
Connections are labeled with a positive (+) and negative (-) symbol.
Connections are via 5.08mm pluggable screw terminal blocks.
A cable harness set is supplied with the VFOM-1. Each cable in this set connects the output of two AM-
600 amplifier modules to corresponding connections on the VFOM-1. Harness connections are
numbered. Ensure the numbers correspond with the AM-600 channels and the VFOM-1 connector
numbers. Connections to speakers must be made using the AM-600 amplifier output connectors supplied
as part of the VFOM-1 harness set. Cables to speakers must be paralleled with harness cables to the
VFOM-1 in each AM-600 output connector.
Supported Failover Modes
The VFOM-1 failover module facilitates two failover modes for the VA-8600:
7:1 failover mode:
Amplifier channel 8 is assigned as the failover channel for channels 1 through
7. The amplifier can be configured from 2:1 failover up to 7:1 failover, but the failover channel will
only ever be channel 8.
3:1 failover mode:
Amplifier channels 4 and 8 are assigned as failover channels for channels 1
through 3 and 5 through 7 respectively. The amplifier can be configured for 2:1 failover if fewer
channels are required; however, the failover channels will always be 4 and 8.
When either of these failover modes is selected, other failover modes (1:1 channel failover and device
failover) are not possible for that VA-8600. Dual 3:1 failover does not permit a mix of failover modes/non-
failover modes within one VA-8600 unit. Note also that 3:1 or 7:1 failover inherently precludes failover of
more than one channel in a failover group.
Initiation of a failover condition is through automatic detection of an unrecoverable failure in an amplifier
channel within the failover group. Unrecoverable failure may be determined by one or more of the
following amplifier fault conditions: Loss of communications to the amplifier; DC on Amplifier Output;
Thermal Overload; Persistent Output Short Circuit; Persistent Power Supply Drop or Loss of Power
Supply. When failover is initiated, the load is disconnected from the failed channel and connected via the
VFOM-1 to the designated failover channel. In addition, the configuration for the failed channel is copied
to the failover channel to preserve parameters such as zone assignment, equalization, etc.
Note that if the failure of an amplifier channel is caused by factors external to the amplifier (such as a
short circuited speaker cable), that condition may also cause unrecoverable failure of the failover channel
after failover has occurred. Once failover has occurred, it will remain permanent until the amplifier unit is
re-powered.
