Troubleshooting Guide

3
PROBLEM POSSIBLE CAUSE ACTION
Bender does not
stop at selected
bend size (angle).
Bend limit switch is not being actu-
ated by shoe post
Remove shoe indicator plate. Observe the tabs as they
pass the bend limit switch. Adjust switch until tabs cor-
rectly contact the posts.
Bend limit switch is not functioning Unplug the bender power cord. Attach leads to orange
and green wires at the switch. Continuity should exist.
Push the actuator tab (on the switch). Continuity should
be broken. If not, replace the switch.
Breaking resistor is not functioning Unplug the bender power cord. Perform resistance mea-
surement on breaking resistor. Attach leads across termi-
nals. A 9-11 ohms (+ 1 ohm) resistance is normal. Other
readings are unacceptable. Replace breaking resistor,
Part Number - DA7034380.
Brake circuit (P.C. board) not func-
tioning
If all other tests are positive, replace P.C. board, Part
Number - DA7034380.
During return func-
tion, bender shoe
does not stop at zero
point.
Plunger on return limit switch is not
being tripped by the trip ring tab
Remove limit switch assembly. Observe tab to return lim-
it switch contact. If switch is not contacting tab, adjust
switch position.
Bend limit switch is not
functioning
If post to switch contact is correct, perform bend limit
switch continuity check. Attach leads to orange and
green wires. Press limit switch tab. Continuity should
result. If not, replace switch.
Return limit switch not
functioning
Perform return limit switch continuity check. Attach leads
to white and blue wires. Continuity must exist when
pressing actuator tab. If not replace return limit switch.
Brake resistors not functioning Unplug power cord. Perform resistance measurement on
each resistor. Place ohm meter leads on gray and brown
wires. Meter should read 9-11 ohms. If reading is over 11
ohms, replace resistors.
Bend function works,
return function
results in bending
direction.
Direction circuit, on P.C. board not
functioning
Replace P.C. board.
Return function
works, bend func-
tion results in shoe
moving in return
direction.
Brake circuit on P.C. board not
functioning
If all other tests are positive, replace P.C. board.
Return function
works. Depressing
bend switch, shoe
moves in return.
Direction circuit, on P.C. board, not
functioning
Replace P.C. board