Rockford Systems, LLC
17
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SECTION 4—TROUBLESHOOTING
Adjustable Stroke Detect-A-Finger
®
Drop-Probe Device
SYMPTOM 4
After depressing the foot switch, the sensing probe goes to bottom of stroke but the machine will not cycle.
SOLUTION
Open the door of the control box. Actuate the foot switch to the middle position if the machine has a two-stage operation, or all the way
down for single-stage operation. Check the DC voltage on terminal 9 and 11 on P2 connector. The voltage on terminal 11 should read
+24 volts DC. If not, completely release the foot switch and check the voltage on terminal 11 again. If the meter now reads +24 volts
DC when the probe is in the up position, one of the wires on the mini limit switch inside the drop-probe assembly is connected to the
NC contact. Turn off all electrical power to the machine, remove the door of the drop-probe assembly, and connect the mini limit switch
wire to the proper NO contact.
Once the above problem is corrected, actuate the foot switch to the middle position or all the way down. The device should now be
at the bottom of the stroke. Verify that the down stop locking collar is completely down and resting against the top of the air cylinder.
The down stop locking collar must be down against the top of the air cylinder before the machine can cycle.
If the down
stop locking collar is all the way down and touching the air cylinder, the mini limit switch may need to be adjusted slightly. Note: This
adjustment is very sensitive and should not require much movement. Slightly loosen the two 10-32 hex head screws on the back of
the drop-probe assembly and move the limit switch mounting block closer towards the clamp collar. Retighten the two 10-32 hex head
screws. When the limit switch mounting bracket is properly adjusted, you should hear a slight click sound just before the clamp collar is
completely down against the top of the air cylinder. If the limit switch is adjusted too far in, it will cause the normal cycle of the machine
to begin before the sensing probe is at its lowest point. This may be an unsafe condition for the operator.
If the machine still does not cycle, check that outputs (terminals 15-16 and 17-18 on P2 connector) are properly interfaced into your
machine cycle control circuit. These outputs are dry contacts and may be used with 24 V DC or 115/240 V AC.
