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
213
of
240
10.8.14
Three
-
phase
inverter
VF
VF
-
S15
Manufactures part number:
VF
VF
-
S15
Kelvin Hughes part number:
45
45
-
690
-
0084
002
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.
Maintenance:
The maintenance or the inverter is restricted to replacement
of the cooling fan if it becomes faulty.
The manufactures recommend that the fans are changed every 10
years
which coincides with the recommended replacement of the complete
inverter assembly.
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 app
lied to the system, three phase
voltages are generated and the antenna WILL ROTATE even if no RUN command is
present.
WARNING:
Unauthorised adjustment of the inverter parameters can potentially damage
the antenna motor or stop the operation/ output of the inverter.
Basic schematic
The inverter voltage
s
and speed
s are
set during manufacture, apart from the tasks detailed in planned
maintenance;
no operator action is required for 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