4
Figure 1— Controls and Indicators
2.4
Wheel Placement
Correct wheel placement is necessary for accurate weighing of vehicles. For best results, the ramp approach
of each weigher should be firmly seated against the tires and the weigher platform centered with the wheel
prior to driving the vehicle onto the weigher.
Occasionally the outside tire has such low air pressure that the inside tire of a dual set does not clear the
ground. This will give an erroneous reading since the inner tire is bearing part of the load. The PW 400/PW
500 weigher design is such that either tire may be used. To weigh inside tires, turn the weigher 180 degrees
and continue weighing. The sum of the wheel weights will still equal the axle weight.
Experience is the real key to successful portable weighing. Incorrect weighing results can usually be attrib-
uted to improper procedure. Following these basic rules of portable weighing will insure the best possible
results.
2.5
Controls and Indicators
Figure 1 shows the weigher display and controls conveniently located on the handle side of the weigher. The
display is a 1 line, 16 character, alphanumeric liquid crystal display (LCD) with a magnified character height
of 1/2 inch. The display is backlit for night time operation of the weigher.
Operational switches and connectors are shown in Figure 1 and function as follows:
RST-OFF/ON
This is a sealed, double-pole, double-throw momentary toggle switch.
Press the switch to the right and release to turn the weigher ON.
Press the switch to the right again and release to turn the weigher OFF.
ZERO
This is a sealed, momentary push-button switch.
Press the switch to ZERO the display before weighing.
LCL/TTL
This is a sealed, momentary push-button switch. Press the switch to toggle between the LOCAL and
TOTAL modes. (Requires two or more weighers be connected together via communication cable).
LCL/TTL
RST-OFF/ON
ZERO
COMM
CHGR
Display
