21
JAMMING
Should a press trips out on overload because it has become jammed, a series of
steps can be taken to un-jam the press. Generally, the easiest thing to do is to
reverse the leads on the electric motor drive. This will cause the screw to feed
material backward into the inlet hopper.
Generally jamming is caused by over-pressing excessively dry material. Running
the press backwards will break up this material. If the jamming was caused by
tramp material, hopefully this can be found and retrieved from the inlet hopper
following operation in the reverse direction.
Having a reversing starter greatly facilitates this operation. These cost little more than a
standard starter; they come with a forward-reverse switch. (Having a VFD with a reverse
button can be even handier.)
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