Arm rotates up, but
will not rotate
down.
• Check LEDs on terminals 6, 7 and 9. Any of these ON will hold the
arm in the UP position. This indicates a shorted input.
• Check the LEDs on the loop detectors. Any ON will hold the arm in
the UP position. Possible loop or loop detector problem.
• If auto timer is not used (SW1, switch 7 off), check to be sure SW1,
switch 6 is in the ON position. This will cause terminal 6 to rotate
the arm down when it is activated.
• Check to be sure SW1, switch 4 is ON. This will cause terminal 8
activation, then deactivation to rotate arm down.
Arm rotates down,
but will not rotate
up.
• Possible direction problem. See section 4.2 to change direction of
arm. After changing direction, refer to previous troubleshooting.
Arm begins to
rotate down, and
then changes
direction.
• Check ERD LED. If it flashes, rotate the ERD sensitivity
potentiometer counter-clockwise 1/8 turn and re-check. If ERD
LED does not flash, go to next step.
• Check terminal 6, 7 and 9 input LEDs for false operation. If these
flash during the down movement, arm will reverse direction.
• Check loop detector LEDs for false operation.
Arm rotates down,
then immediately
rotates up.
• Check terminal 6, 7, 8 and 9 input LEDs. Any turned ON can
cause this problem.
• Check limit LEDs. If LED does not illuminate when magnet passes
by, turn power off and adjust magnet so that it is closer to the
control board as it passes by.
Down input / down
loop will not rotate
arm to down
position.
• Check to be sure SW1, switch 4 is in the ON position.
• Down input must be activated, and then deactivated to cause arm
to rotate down.
Loop detector LED
is on continuously.
• Activate the reset switch on the loop detector.
• Decrease loop detector sensitivity.
• Check loop wire for resistance to ground with meg-ohm meter.
Should be 100 meg-ohms or higher. If less than 50 meg-ohms,
replace loop wire.
• Be sure loop lead-in wire is twisted at least 6 turns per foot.
• Be sure all loop connections are soldered.
• Replace loop detector.
Loop detector LED
never activates.
• Increase loop detector sensitivity.
• Check continuity of loop wire. Should be 0 ohms. If continuity
check indicates anything other than 0 ohms, check all connections.
Replace loop wire.
• Move loop detector board to the other loop detector port on the
control board, and then check loop operation. If loop detector still
fails, replace loop board.
• If loop detector operates OK in the other loop port, replace control
board.
45
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