Installation guide

VAR4 / VAR12 / VAR20 - Product Description
Once a fault is physically fixed it is still latched on the LCD display. It is removed from the latched display by
pressing the front panel FAULT CLEAR key, or through the user interface’s ‘Faults’ menu. If a fault cleared in
this way still persists, then the fault warning condition will be restored within 100 seconds.
Pressing the clear button releases any active amplifier standby switching to reset the system to a known
state.
The unit features a LAMP TEST key. Pressing this switch will cause all indicators on the VAR Router to
operate and the fault and health indicators on all mainframes and amplifiers to also illuminate. The built in
sounder is also tested.
L
The user must be logged on to Clear Faults.
4.3.3 Fault Logging
The unit maintains a time-stamped 200 event fault log in non-volatile memory, this include event acceptance
and clearance, and user logging in and out times. The non-volatile memory has an endurance of greater
than 100,000 cycles.
All faults are logged on separate frame fault logs for frame-specific faults retained by each frame and a
single system fault log retained by the VAR Router, which stores all faults (200 events).
To prevent intermittent or frequently recurring faults from rapidly causing excessive write operations to the
memory, faults are latched so that a recurring fault is logged in its first instance, and thereafter any
repetitions are not recorded, unless a physical manual fault ‘clear’ has taken place.
The fault log is continuously checked, and, if it is found to be corrupted, it is erased and a new ‘LOG
CLEARED’ fault is logged. A manual fault log clearing function is also provided.
4.3.4 Fault Relays and Remote Fault Outputs
The unit features a fault relay, for indicating system health to external equipment. The relay is normally
energised to indicate system health, and de-energised in the event of system fault. If power is removed then
a fault is indicated. In addition to the normal relay contacts a second set, fitted with series parallel resistors,
is available to allow the connection from the relay to be monitored by external equipment. Both relays are
located on the base VAR4 unit Control Port 1. See connection details in Section “6.3.5 Fault Relay Output
Wiring Examples”.
To allow a remote indication and acceptance of faults, a connector is provided with the necessary inputs and
outputs to allow a remote fault panel to be used, see Section “3.7.4 Remote Fault Indication”.
4.3.5 Remote Diagnostics
The VAR Router supports a dial-in remote diagnostic interface allowing remote interrogation of fault status
from a remote site. Because all parameters are controlled digitally, it is also possible to adjust routing and
audio parameters remotely. See the ASL VAR Remote Diagnostics Software manual for details.
Issue: 03 complete, approved
Page 40 of 68