Maintenance Handbook

SBS-800 Series Operator & Planned Maintenance Handbook
Chapter 9: Planned Maintenance
KH-1601-2 Issue 6
Page 65 of 80
RADAR DISTRIBUTION UNIT (RDU)
Task
Description
Pass
Fail
Cleaning
External
surfaces
Clean with a soft, non-abrasive cloth lightly moistened
in a mild soap solution.
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Internal
surfaces
Open the door of the Radar Distribution Unit using a
screwdriver.
Clean the unit using blower and/or soft brush.
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Physical
inspection
External
Ensure that all mounting bolts are secure.
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Ensure all connectors are securely in place.
Inspect cabling for condition and wear.
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Check that all air vents are clear of obstructions and
dust.
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Internal
Ensure all PCBs and connectors are securely in place.
Inspect internal cabling for condition and wear.
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Check that all air vents and fans are clear of
obstructions and clear of dust accumulation.
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General
The system should be checked to ensure that there is
no obvious external damage or potential fault
conditions that could lead to a general failure of any
part of the system.
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Earth
bonding
and
continuity
On the underside of the RDU, visually inspect the earth terminal for
damage and corrosion. If corrosion is present, clean and re-
terminate as described in Section 9.4.
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Check that the earth bonding strap between the radar distribution
unit door and chassis is secure and has a good electrical
connection.
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Test the earth bonding conductivity by attaching one lead of the test
equipment
note
to earth/chassis and the other to an unpainted part of
the equipment under test.
Check the earth bonding for continuity, the resistance should not
exceed 0.1 ohms (see section 9.4). If a test fails, investigate the
bonding, rectify and repeat the test.
Note: Safety ohmmeter, Bridge Megger or Multimeter.
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Inverter
Fan
Condition
Check
Depending on the ambient temperature and loading conditions, the
fan within the static inverter has a predefined service life (e.g. 10
years).
The fan run time must be checked annually to see if the fan needs
replacement.
WARNING:
Lethal single and 3-Phase AC supplies are present within the RDU.
Check the Inverter fan run time (e.g. t0.50)
Run Time
Hrs.
Fan Inverter OK or Change Inverter?
FAN
OK
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Change
Inverter
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