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CHAPTER 7 - TROUBLESHOOTING GUIDE
There are only 3 serviceable components in the PosiGround system: the
controller, the clamp module, and the pneumatic switch. Each part can be
tested independently.
To test the pneumatic switch, disconnect the terminals and connect a
continuity tester across the terminals. When there is no pressure to the
switch, there should be continuity. Applying more than about 4 PSI of air
pressure should cause the switch to open.
To test the clamp module, connect the red wire to the yellow ground sense
wire of a PosiGround controller (one that you know is good), and the black
wire to the black ground wire of the controller. The controller should show
6O
"
", if not then the module is defective.
To test the controller, connect test lights between +12 volts and the warning
horn and final alarm wires. Connect a known good clamp module (CM red
to controller yellow, CM black to controller black). The display should
read "6O E" and the final alarm light should be on and the warning horn
or light should be off. Note that it may take 1 to 2 seconds for the display
to respond. Shorting the ground sense and ground wires together should
" and the final alarm light should stay on and the warning
SH E
show "
horn or light should flash for a set time, and then both lights should go
out. Shorting the final alarm and ground wires together should turn on
the final alarm light, and the display should show "
SH d
". Removing this
short should start the warning horn or light flashing and the final alarm
light should stay on for a set time. Remove the short between the ground
6O E
sense and ground wires, the display should read "
" again. Removing
" and the final alarm light should
OP E
the clamp module should show "
stay on and the warning horn or light should flash for a set time, and then
both lights should go out.
If all components check out but problems are still encountered, check the
wiring for faults by starting at the controller and working out from there.
Page 26
672-H Manual
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