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With the pedal depressed, the voltage should read 110 to 120 volts between #21 and Ground.
There should be no voltage reading between #20 and Ground. If these readings are not
correct, continue on with the following steps.
A.
Turn the machine’s power off at the SHEAR/NOTCH station and turn off the disconnect switch.
Remove the cover on the foot pedal and check for any loose connections.
B.
Make sure that the switches are adjusted properly. (You should hear two distinct "clicks",
approximately 1/2 inch (12mm) apart, when depressing the pedal.) There is a set screw adjustment
on the pedal shaft to adjust the switches.
C.
Check the switches with an Ohm meter.
9. Damage to the foot pedal cord: Use an Ohm meter to check the continuity of the wires from the
foot pedal. Make sure that the power to the machine is off and locked. The wires must be
disconnected from the pedal and terminal block.
8.1B LIMIT SWITCH INSPECTION:
PUNCH/TOOL STATION
To determine if the limit switches are functioning properly, move the limit switches out to their farthest
position. Place the SHEAR/NOTCH selector switch in the START position and the disconnect switch in
the ON position to power the machine. Place the selector switch in the SHEAR position. Depressing the
foot switch should cause the machine to move and releasing it should cause it to return. This indicates the
control valve is working properly. While depressing the foot switch, use a pencil or similar device and
depress the limit switch that the metering boss is traveling towards. If the machine does not stop when
the switch is depressed, the limit switch is not functioning properly. Check both limit switches.
8.1C LIMIT SWITCH INSPECTION:
SHEAR/NOTCH STATION
To determine if the limit switches are functioning properly, place the run/jog switch in the JOG position
and move the limit switches out to their farthest position. Place the PUNCH/TOOL selector switch in
the START position and the disconnect switch in the ON position to power the machine. Place the selector
switch in the PUNCH position. The machine should move when the jog button is pushed and stop moving
when released. This would indicate the control valve is working properly.
While holding the jog control, use a pencil or similar device and depress the limit switch plunger that the
metering boss is traveling towards. If the machine stops when the switch is depressed, the limit switch is
functioning properly. This would also indicate the control valve is working properly as well. Check both
limit switches.
If the machine does not stop when the limit switch plunger is depressed, the limit switch is not functioning
properly.
Check the limit switch plunger to make sure that it is operating freely. The limit switch can be tested
with an Ohm meter. The limit switch wires must be disconnected from the terminal block to test it. The
switch should have continuity with the plunger out and open with the plunger depressed. Call the factory
for help if needed.
