67Bend-Tech Dragon A150
Troubleshooting Guide
Limit Switch Operation
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Limit Switch Operation
Limit Switch Operation
The Dragon A150 uses a normally closed limit switch system. There are three limit switches,
and one on the Trolley (X axis). When a limit switch is triggered it opens the loop. The switches
are normally closed, so when a switch is triggered it breaks the loop.
Symptom Cause Corrective Action
A limit switch broken
The machine lost power
and the Toolhead crashed
against the A axis limit
switch
Replace the A limit switch
Machine wouldn’t home
X axis limit switch has
failed
Replace X limit switch
Mach Connection Error
message
If the machine is parked
on a limit switch the
software will show a Mach
Connection Error that
reads Unable to Home All
Axes.
switch
Limit switch triggered but
all limit switches test OK
Possible failed Control Box
Replace Control Box; contact Bend-
Tech service tech
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