Vigilant MICROVAC, Owner'S Manual

Vigilant MICROVAC Owner's Manual

Document: LT0109

Operation

Page 3-4

5 April 2000

Issue 1.31

3.4 

INTERNAL FAULT DISPLAY & MUTE SWITCH

The 7 segment display on the Main PCB is used to indicate any fault or alarm conditions that
are or have been present. The display value indicates the source as follows :

1

BGA Input in alarm

2 

FIP Input in alarm

3 

Networked mode selected but no communication with ECM

4 

In networked mode, a network fault exists.  Details of the fault may be
displayed at another panel, or the ECM may be interrogated with a terminal.

6

BGA Input in fault

7

FIP Input in fault

A

Amplifier or line transformer fault

b

Battery voltage low

C

Battery charger voltage low

F

Battery voltage below a battery fail level

H

Battery charger voltage high

L

Speaker line in fault

S

Strobe line in fault

E

Mains failure

When more than one of the above conditions is or has been active, the display will cycle
through the conditions in no particular order. To clear the display (or at least those conditions
which have been cleared), select MANUAL and hold the MUTE button on the PCB  for 2
seconds. When all faults or abnormal conditions have been cleared the display will cycle
around its seven segments.

When a fault is detected the type of fault is shown on the front panel and the 7 segment
display, the buzzer beeps and the fault relay de-energises (it is normally energised).  If the
fault returns to normal then the buzzer will stop and the relay will energise but the display will
latch the cause of the fault.

The MUTE button on the PCB has the same function as the SILENCE button on the front
panel, but with the added effect of clearing the latched fault codes on the 7 segment display
when it is held for 2 seconds.

If the 7 segment display is slowly scanning through all its segments then the system is
operating normally with no faults present or latched.

Note that charger voltage low monitoring is disabled when Alert, Evacuate, or PA Speech
are selected, however battery low voltage monitoring is continued. This is because the total
load placed on the Microvac may exceed the PSU capacity and the batteries will be
discharging rather than charging.