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
218
of
240
10.8.16
Single phase inverter
VF
VF
-
nC3
Manufactures part number:
VF
VF
-
nC3
Kelvin Hughes part number:
45
45
-
690
-
0066
001
An optional inverter is available that has a single phase AC voltage input. This is used where a 3
phase supply is not available on site.
The
Radar Distribution Unit
can be fitted with different
three
phase inverter
s
designed to meet the site AC
requirements.
This converts the incoming single phase AC supply into a three
-
phase
voltage suitable for the supply and control of the antenna motor.
The unit is also configured
to
provide a soft start
,
a soft stop for the Motor
and antenna speed selection
(system dependent)
.
The inverter is not a retro fit item and must be specified at the point of order.
Note:
With the exception of the user accessible and replaceable fan, t
he inverter is a
factory sealed unit that contains no field serviceable parts.
WARNING
:
Lethal voltages are present within the RDU and the inverter.
The system must
be fully isolated from all sources of power prior to commencing any inspection or
maintenance proc
edures.
Antenna rotation warning:
When AC voltages are applied,
three phase voltages are
generated and the antenna WILL ROTATE even if no RUN command is present.
Basic schematic
The inverter voltage and speed is set during manufacture, apart from the tasks detailed in planned
maintenance, no operator action is required for the inverter.
Caution:
Unauthorised adjustment of the inverter parameters can potentially damage the
antenna motor or stop the operation/ output of the inverter.
PL
PL
1:
Single
phase input
Filter and
indicator
6.0
A
breaker
Contactor
Motor
inverter
Safety I
loop
Antenna RPM control
Motor ON/ OFF control
SK4:
3
-
phase
output to
a
ntenna motor