User's Manual

Troubleshooting
3A0294G 73
Troubleshooting
NOTE: Troubleshooting covered in this manual is spe-
cific to the shot dispense kits. Refer to your Supply Sys-
tems Repair-Parts manual or pump packages
instructions-parts manual for system specific trouble-
shooting. For air motor or pump troubleshooting ques-
tions, refer to your NXT air motor instruction-parts
manual or pump instructions-parts manual. See
Related Manuals, page 3, for specific manual numbers.
1. Follow the Operation, page 62.
2. Disconnect all power to the supply system or pump
package before repairing.
3. Check all possible problems before disassembling
any part of the supply system, pump package, or
shot dispense kit.
Problem Cause Solution
Display volume matches pump vol-
ume but is consistently higher than
nominal shot size.
System has not finished compen-
sating for higher overshoot.
Dispense more shots. Shot volumes
should converge on nominal.
Display volume matches pump vol-
ume but is consistently lower than
nominal shot size.
System has not finished compen-
sating for lower overshoot.
Dispense more shots. Shot volumes
should converge on nominal.
Display volume does not match
actual volume pumped.
Changeovers are out of calibration. Perform calibration procedure; see
Errors, page 66.
Incorrect pump selected during
setup.
Chose correct pump and pump size
in setup screen 4.
Shots are consistently inaccurate. See Tips for Better Accuracy,
page 102.
See Tips for Better Accuracy,
page 102.
Display shows shot is active when
start button is pushed, but no mate-
rial is pumped.
No air supply to the air motor. Check air supply to air motor.
Dispense valve is stuck closed. Check the dispense valve to ensure
it is opening and closing correctly.
No air supply to dispense valve. Check the dispense valve to ensure
it is opening and closing correctly.
Shots that end near a changeover
are noticeably less accurate.
Not enough shots have taken place
within this area for the compensa-
tion factor to be accurate.
Continue dispensing shots. As more
shots take place in this area accu-
racy will improve.