User's Manual

SBS-900 Shore Based Radar Systems
Chapter 10: Corrective maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 220 of 240
Reset the fan run-time counter
When the fan has been replaced, the run time counter in the inverter must be reset to zero as follows:
Caution: The following task is carried out with the inverter switched ON and must only be
undertaken by a qualified electrical engineer who understands the voltage hazards
present within the inverter and the Radar Distribution Unit.
Setup: The Radar Distribution Unit must be switched ON.
The Local/ Remote switch on the door of the RDU is set to Local.
The man aloft and antenna rotation switches are both in the FREE position.
WARNING: The following task is carried out with the Radar Distribution Unit switched ON
and powered. Lethal voltages are present within the unit so extreme care must be taken
when carrying out the adjustments detailed below.
I. On the inverter press the STOP button and wait until 0.0 is
displayed. This stops the inverter producing a three-phase output but
single and three-phase AC supplies are still present within the
system.
II. Press the Mode button once, the PRG lamp will illuminate.
III. Rotate the thumbwheel until typ is displayed.
IV. Press the thumbwheel and again rotate the wheel until menu 9 is
displayed.
V. Press ENT again. This reset the fan run-time counter to zero.
VI. Press MODE until 0.0 is displayed.
VII. Ensure the PRG lamp is no longer illuminated.
VIII.
Close and secure the RDU door then test the
system
Inverter replacement
After 5-years of use, the static inverter located within the radar distribution unit must be changed as
over time, the electrolytic capacitors within the inverter can dry out.
The inverter replacement procedure is detailed in the routine maintenance section 9.6.2 page 107.