Wulftec WRTA-150 - Troubleshooting WRTA 150; Clamp, Heat Wire, and Motor Tension Problems

Wulftec / M.J. Maillis Group Page 35 of 36 Version 1.7.1 /November 2014
Problems Causes Solutions
Clamp does
not open after
1-1/2 turns
•Air cylinder does not retract.
•Carriage bottom limit stop may be too
low and the film is wrapping too low
onto the clamp preventing it from
opening.
• Look for kink in the hose. If none,
adjust the valve flow controls
• Move the stop block higher for the film
to wrap approx. 5 inches over the clamp
jaws.
Heat wire does
not cut the
film
•The push arm may not have engaged
completely.
•The fuse may be burned.
•The cut wire may have broken.
•The flow controls on the cylinders may
need adjusting.
•There may be a lack of air pressure to
the system.
•The cylinder may be defective.
• Look for the reed switch to make sure
the PLC receives the signal when the
arm is out.
• Check for short, if none, change the
fuse using the appropriate rating
• Change the cut wire with .032 gage
nychrome wire.
• Look for kink in the hose. If none are
found adjust the flow control on the
cylinder.
• Look for the air pressure gage it should
not be below 80PSI
• Change the defective cylinder.
Heat wire does
not go back
home
•The flow controls on the cylinders may
need adjusting.
•There may be a lack of air pressure to
the system
•The cylinder may be defective.
• Look for kink in the hose. If none,
adjust the valve flow control.
• Look for the air pressure gage should
not be below 80 PSI.
• Change the defective cylinder.
Machine stops
in the middle
of a cycle
•An alarm is activated. • Look for the alarm on the touch
screen, take the corrective measure;
then accept the alarm and restart the
cycle.
Motor on film
tension never
stops turning
•The steel cam is not touching the analog
sensor when the dancer bar is at rest
position.
•The minimum speed trim pot on the
pre-stretch drive is not set to minimum.
•The tension adjustment spring on the
side of the carriage is set too light.
•The clamp is open.
•Turn the steel cam closer to the analog
sensor or move the analog sensor
toward the cam. The analog sensor and
the cam are situated under the red
cover on the film carriage.
• Turn the minimum speed trim pot
counter clockwise on the pre-stretch
drive.
• Increase pressure on the spring by
turning the knob clockwise.
• Close the clamp.
Motor on film
tension never
turns
•The motor fuse is burned.
•The motor fuse is off.
•The fuse on the analog board is burned.
•Analog sensor may be defective.
• Check for short, if none, change the
fuse using the appropriate rating
• Turn on the motor fuse.
• Check for short, if none, change the
fuse using the appropriate rating
• Call technical service at Wulftec.