User Manual

Axell Wireless Limited
Technical Literature
L.A. M.T.A. Remote Sites
Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 39 of 148
20-001602 Specification
PARAMETER SPECIFICATION
Operating voltage 8 to 30V (floating earth)
Alarm Threshold Vcc - 1.20 volt +15%
Alarm output relay contacts:
Max. switch current 1.0Amp
Max. switch volts 120Vdc/60VA
Max. switch power 24W/60VA
Min. switch load 10.0µA/10.0mV
Relay isolation 1.5kV
Mechanical life >2x10
7
operations
Relay approval BT type 56
Connector details Screw terminals
operational -10°C to +60°C Temperature
range
storage -20°C to +70°C
3.4.5.11. 24V Relay Assembly (80-008902)
The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is
equipped with a single, dual pole, change-over relay RL1 with completely isolated wiring, accessed
via screw terminals.
The relay is provided with a polarity protection diode and diodes for suppressing the transients
caused by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring
circuits. It’s common use is to amalgamate all the alarm signals into one, volts-free relay contact pair
for the main alarm system.
80-008902 Specification
Parameter Specification
Max. switch current 1.0Amp
Max. switch volts 120Vdc/60VA
Max. switch power 24W/60VA
Min. switch load 10.0µA/10.0mV
Relay isolation 1.5kV
Mechanical life >2x10
7
operations
Relay approval BT type 56
Connector details 15-way 0.1" pitch
operational -10°C to +55°C Temperature
range
storage -40°C to +70°C
3.4.5.12. Dual Diode Assembly (94-100004)
The purpose of these dual diode assemblies is to allow two DC voltage sources to be combined, so
that the main DC rail within the equipment can be sourced from either a mains driven PSU, or
externally through an XLR connector or from dual mains driven PSUs . They are very heavy-duty
diodes and they prevent any reverse current from flowing back to their source or the alternative
supply rail. Combining diodes such as these will also be used if the equipment is to be powered from
external back-up batteries.