Generated scale

[James Net]

I'm viewing a satellite map of a large area and my mapserver generated scale 
seems a little wrong. Viewing a whole state (of Australia) mapserver 
generates a scale ranging from 0 --->  0.001km (see attached). And when I 
zoom-in the scale bar goes to 0 ---> 0. Any ideas? I thought my scale should 
be like 1 ---> 1000km. Am I not reading it right? Am I missing or have I 
stuffed up a map file config option / setting?

My Map file:

MAP
   NAME        WEX
   IMAGETYPE   jpeg
   EXTENT      140 -41 150 -33
   SIZE        600 600
   DEBUG       ON
   TRANSPARENT ON
   IMAGECOLOR  239 242 248 # The background Color.

   WEB
      LOG         "mylog.log" # The Debug Log.
      TEMPLATE    "template.html"
      IMAGEPATH   "/var/web/tmp/"
      IMAGEURL    "/tmp/"
      METADATA
         wms_title   "WEX"
         wms_srs     "EPSG:4283"
         wms_onlineresource   "http://myserver/cgi-bin/mapserv?map=wex.map"
      END
      MAXSCALE 50.0
      MINSCALE 0.1
   END

   PROJECTION
      "init=epsg:4283"
   END

...

   SCALEBAR
      IMAGECOLOR 0 0 0
      LABEL
         COLOR 255 255 255
         SIZE  TINY
      END
      STYLE 1
      SIZE  100 2
      COLOR 255 255 255
      UNITS kilometers
      INTERVALS   1
      TRANSPARENT TRUE
      STATUS      ON
   END

...
LAYER stuff
...
END # EOF


Thanks in advance!

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