User's Manual

SBS
-
900 Shore
Ba
Ba
sed
Radar Systems
Chapter
10
10
:
Corrective maintenance
KH
KH
-
1602 2
issue 1
:
Standard SBS900 Systems Operator & Maintenance Handbook
Page
182
of
240
10.8.4
Breakers
The Radar Distribution Unit
is fitted with three
user accessible DIN rail mounted earth leakage trips/
breakers located in the base of the RDU behind the main access door.
The output of the breakers is fed to the
rest of the
system via contactors that are controlled by the
RDU as shown below.
RDU Single phase AC input schematic
RDU
single and 3
-
phase AC input
and breaker
schematic
AC power indication:
When AC supplies are connected to the RDU, LED indicators illuminate on
the
breakers regardless of their state indicating that AC mains is present
within the system.
Earth leakage
Due to the use of EMC filters on all AC supply inputs, earth leakage current
to a
maximum of
100mA
will exist on the
3
-
phase input.
All parts of the
system must be fully and correctly earthed prior to connecting
any source of AC power.
RCD trips:
I
f an RCD trip is fitted in the supply outlet it must be a
1
00mA RCD Type A or
similar.
Spare:
If replaced, the breakers within the RDU must be of the exact
same type
PL
PL
1:
3
-
phase
input
Filter and
indicator
6.0
A
breaker
Contactor
Motor
inverter
Safety switch
Antenna RPM control
Motor ON/ OFF control
SK4:
3
-
phase
output to
a
ntenna motor