HESA HE400 Quick Start Manual

DOCUMENTAZIONE TECNICA
MODEL HE400 MICROWAVE BARRIER
INTRODUCTION
The HE400 is a microwave barrier system for external
protection that requires a simple and fast assembly.
The maximum distance of the beam between a
transmitter and a receiver is 200 meters. The HE400
barrier features four field selectable modulation fre-
quencies to allow the installation of barriers within clo-
se proximity and to reduce the possibility of cross link
modulation or mutual interference.
The HE400 barriers requires a low current absorption
(40mA RX, 38mA TX) thus allowing autonomy for a
long period of time with the use of the internal 12 Vcc
– 2,1Ah battery (in each TX and RX units) in case of
mains power failure. This battery gives an autonomy
of over 36 hours.
Description
Each model HE400 consist of one model HE400T
transmitter and one model HE400R receiver, each sup-
plied with universal mounting bracket for pole mod.
HE401 (diameter mm 70-100).
In order to satisfy more specific installation require-
ments, the following accessories for HE400 are avai-
lable as option:
Part
Model
number
HE402 HE402
HE403 HE403
HE405 HE405
HE410 HE410
HETS400 TS400
HE19-12 GP2.1-12
Model HE400 microwave barrier
(cod. HE400)
Description
Horizontal wall moun-
ting bracket
Pole mounting bracket for
diameter 70-110 mm
Transformer for powering
one HE400T or HE400R:
230Vac/19 Vac, 30 VA
Outdoor container for
HE405 transformer. For
pole mounting use
HE403 bracket
Test instrument for
HE400
12V 2,1 Ah backup
battery for HE400T and
HE400R.
TECHNICAL DOCUMENTATION
Fig. 1 - Detection pattern
Principles of operation
The transmitter radiates amplitude modulated X-band
energy to the receiver where the received energy is
amplified and processed so that it causes an alarm re-
lay to be energized. When an intruder approaches
the beam, the energy detected by the receiver causes,
if the predetermined level is reached, the relay to be
de-energized and therefore an alarm. Operation of
model HE400 is illustrated in Figure 1. A single model
HE400 may cover a distance up to 200m.
The Receiver incorporates an automatic gain control
circuit (AGC) that adequates the signal to the distance
needed to be covered. Furthermore there are phased
locked loop circuits (PLL) to detect the signal radiated
within a specified frequency band.
Another possibility is the possibility to synchronize the
transmitters: in case two or more TX units have to be in-
stalled on two or more parallel levels in the same di-
rection, a connector is available in order to synchro-
nize the start of the signals radiated to the different re-
ceivers.
Alignment and control
In order to perform a good alignment it is necessary
only a standard voltmeter. On both the receiver and
the transmitter it is available the J2 connector (10 PIN
header) for controlling all the signal and the power
supply levels. We suggest the use of the optional
TS400 Test Instrument Interface that has onboard a
connector, 3 LEDs and buzzer and the connection cab-
le for the J2 header. This interface simplifies the con-
nection of the voltmeter to the barrier. You can even
connect a oscilloscope in order to determine the level
of the received signal.
On the Receiver and the Transmitters boards there are
also 5 LEDs that show the status of the alarm relay, the
presence of the power supply, the correct oscillator
operation and the use of the correct channel between
the TX and the RX.
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