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
215
of
240
10.8.15
Three
-
phase inverter
VF
VF
-
S11
Manufactures part number:
VF
VF
-
S11
Kelvin Hughes part number:
45
45
-
690
-
0065
001
NOTICE: This part has been
superseded by the VF
-
S15 (see previous section)
The
Radar Distribution Unit
can be fitted with different
three
phase
inverter
s designed to meet the site AC requirements.
This converts the incoming three
-
phase supply into a voltage suitable
for the supply and control of the antenna motor.
The unit is also configured
to
provide a soft start and a soft stop for the
Motor.
For systems where a three phase supply is not availab
le
and optional
factory fitted 22
0VAC
single phase input kit is available.
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 three
-
phase 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 to
the system, three phase
voltages are generated and the antenna WILL ROTATE even if no RUN command is
present.
Basic schematic for SBS
-
A1
A1
-
2 and SBS
-
A1
A1
-
3
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:
3
-
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