Vigilant MICROVAC, Owner'S Manual

Page: 14 / 36

Vigilant MICROVAC Owner's Manual Document: LT0109
Installation, Wiring, Setup, and Commissioning
Page 2-2 5 April 2000 Issue 1.31
2.2.4 FAULT RELAY OUTPUT
The fault relay output is available on screw terminals J21, J22 and J23. It is normally
energised and drops out on the existence of one or more fault conditions in the MICROVAC
control unit or its monitored lines. The relay contacts can be used to send the fault condition
to a monitoring system or other annunciation device.
The contacts are rated at 1A @ 30Vdc and any external relay or inductive load must be
clamped for transient suppression.
J21 Fault Relay Normally Open
J22 Fault Relay Normally Closed
J23 Fault Relay Common
Note The relay is normally energised so the NC terminal will be connected to common
when a fault is present.
2.2.5 STROBE OUTPUT
The strobe output must be terminated with either a 2k7 resistor (factory fitted) or with an
STBT9008 Strobe Terminator module (Part number PA0668) if strobe lights are to be used.
The strobe line is monitored for short and open circuit faults, thus the need for the end of line
device.
The wiring for the strobe output is shown in Fig 2.2.
The cable size should be selected so that minimal voltage loss occurs in the cable during
strobe activation. The maximum current is 0.9A and cable voltage drops should be kept
below 1V.
J11 Strobe Line -
J12 Strobe Line +
J12 O
──────┐
┌┴┐ 2k7
└┬┘ Resistor
J11 O
──────┘
NO STROBE LIGHTS FITTED
┌──────────────────────────────┐
│ - ├────┐
│ AMBER │ O ALERT
J12 O
─── // ─────┤ + STBT9008 + ├────┘ +
│ LINE STROBE │
J11 O
─── // ─────┤ - TERMINATOR + ├────┐ +
│ RED │ O EVACUATE
│ (PA0668) - ├────┘ STROBE
└──────────────────────────────┘
STROBE LIGHTS FITTED
FIG 2.2
STROBE OUTPUT WIRING