User's Manual

TD 92082GB
PRELIMINARY
7 May 2012 / Ver. PB7
Installation Guide
LF Location Units
19
3.5 Locator Monitoring
The monitor output is a galvanically isolated relay contact (< 15 ohm) used for supervision
of the locators. The relay contact becomes open circuit (> 1 M ohm) if a fault is detected. It
can be a collapse of the magnetic field due to a discontinuity in the antenna loop, or the
tamper protection has been triggered.
The Antenna Units L951A1, L951A2, and L9
51A2/2 are monitored from the Locator or
Power Amplifier by measuring if the antenna is open circuit or short circuit. Loops are
monitored from the Locator by measuring if the loops are open circuit.
Supply
voltage
Input on
Alarm
Module
6
5
4
3
2
1
Supply
voltage
6
5
4
3
2
1
Monitor
out
Monitor
in
Supply
voltage
Monitor
out
Monitor
in
Monitor
out
Monitor
in
6
5
4
3
2
1
Power
Supply
+
–
Figure 26. Connection of locator monitoring for L951LP units.
1 Connect J01:3 on the Locator or J06:4 on the Power Ampl
ifier to the positive pole on
the external Power Supply (+12 or +24 V DC). Connect J01:4 on a Locator or J06:3 on
a Power Amplifier, and the negative pole on the external Power Supply to the Alarm
Module (T941AM8 or T941AM32 – see Installation Guide for the Alarm Modules).
See figure 26 above for more information.
2 The monitor outputs can be connected in seri
es. Connect J01:6 on a Locator or J06:1
on a Power Amplifier to J01:3 on a Locator or J06:4 on a Power Amplifier. The last
unit in the series has to be strapped. Strap J01:5–6 on a Locator and 
J01:1–2 on a Power Amplifier.