Vigilant MICROVAC, Owner'S Manual

Page: 15 / 36

Document: LT0109 Vigilant MICROVAC Owner's Manual
Installation, Wiring, Setup, and Commissioning
Issue 1.31 5 April 2000 Page 2-3
If multiple strobe lamps are fitted, a strobe terminator module should be used for each lamp.
Remove the 2k7 resistor R4 from all the strobe terminator modules except the last on the
line.
2.2.6 BGM OVERRIDE RELAY OUTPUT
A BGM override relay output is provided to control remote level attenuators that may be
used to reduce the volume when background music is active.
These attenuators must be by-passed when the Alert, Evacuate, PA Speech, or (non-
emergency) Paging functions are selected.
The relay contacts are rated at 1A @ 30Vdc and any external relay or inductive load must be
clamped for transient suppression.
J15 BGM Override Normally Open
J16 BGM Override Normally Closed
J17 BGM Override Common
Note The relay is normally energised so the NC terminal will be connected to common
when any of the Alert, Evacuate, PA Speech, or Paging functions is selected.
Possible wiring of a remote level attenuator and the BGM override relay is shown in Fig 2.3.
J17 O
─────────────────────┐
J15 O
──────────────┐ │
J16 O
────────┐ │ │
J47 O
────────┤ │ └─────────────── O
┌┴┐ │
│ │ │
│ ├
<
────┘ Autotransformer level control
100V
└┬┘
Line
──┴── SPEAKERS
──┬── 1 00µF 1 0V Bipolar
│
J46 O
────────┴──────────────────────────── O
FIG 2.3
BGM LEVEL ATTENUATOR WIRING
2.2.7 ALARM RELAY OUTPUT
An Alarm relay output is provided to indicate that an active FIP or BGA alarm input has been
detected.
The relay contacts are rated at 1A @ 30Vdc and any external relay or inductive load must be
clamped for transient suppression.
J18 Alarm Normally Open
J19 Alarm Normally Closed
J20 Alarm Common
Note The relay is normally not energised so the NO terminal will be connected to common
when one or both of the FIP or BGA inputs is in alarm.