Polychem GP44, Operation And Maintenance Manual, Page: 24 / 105

GP44 Semi-Automatic Strapping Machine
OPERATION - 24-
TROUBLESHOOTING PROCEDURE
Strap Feed
NOTE: If there is a short feed, the green strap feed complete light should not be illuminated. If it is, clean out
the lever to make sure it is not stuck. Also check the switch to make sure it works properly. Check switch
plug for corrosion.
Symptom Cause Solution GP
Sluggish Feed Feed Solenoid is
bottoming out and not
contacting the strap
sufficiently Adjust feed solenoid per procedure
X
Sluggish Feed Spring pressure on
feed solenoid is not
sufficient Increase spring pressure on feed solenoid.
Check to make sure the sprig is the proper type
X
Sluggish Feed Plunger is not engaging
in the feed solenoid Inspect plunger and solenoid for dirt, pitting, or
other obstructions
X
Sluggish Feed Feed bearings are dirty,
wet or greasy. Eliminate the cause of the contamination.
X
Sluggish Feed Feed bearings do not
rotate freely Replace feed roller bearings
X
Sluggish Feed Too much strap or too
little strap in the
accumulator Adjust sensor spring in the accumulator. Make
sure the accumulator feed roller/motor are
working properly and adding strap to the
accumulator. Make sure the sensors detecting
the amount of strap entering the accumulator
(retract wheel and accumulator feed wheel) are
functioning properly. Make sure the parameters
in the PLC program are set properly. Check for
adequate spring tension on the initial feed
rollers. On MR machines check clutch on
accumulator fill roller.
X
Sluggish Feed Right or Left guide are
set too tight and
causing drag on the
strap Adjust guides to approx. strap width + 1mm
X
Sluggish Feed There is a slight
obstruction in the strap
path Inspect strap path, guides and arch for debris
and obstructions. Check all guides have
adequate clearance. Look for damaged arch
track.
X
Sluggish Feed The strap is getting
damaged during the
cutting and/or
tensioning cycle. See Weld and Cut and Tensioning section
X
Sluggish Feed Poor quality strap
(camber) Replace with another roll of strap
X
Sluggish Feed High tension wheel is
damaging the strap and
creating a weak point in Make sure the slip clutch is on the high tension
wheel is slipping 1/4 – 1/3 turn during high
tension cycle.