Diagraph PA/4000, Service Manual, Page: 102 / 213

PA/4000 User’s Manual
Section 10, Troubleshooting
Page 7
Problem: Cylinder extends but retracts before reaching products.
Possible Cause: Tamp dwell time set too small
ACTION:
1. The dwell time must be greater than 30 ms to extend the
cylinder. If it is less than 30 ms, increase the value no more
than 10 ms at a time.
2. Adjust the tamp dwell-time using the procedure as
described in Section 5.4.2.
Possible Cause: Tamp dwell time with auto-retract ON is set too small for
slow-descent cylinder stroke.
ACTION: The auto-retract sensor cannot detect an object farther away than ¼-
inch. A slow-descent cylinder stroke does not sustain enough
momentum to reach the sensed product. If this is the case, increase the
tamp dwell by no more than 10 ms. at a time until the tamp pad
consistantly applies labels to all products.
Possible Cause: Cylinder air pressure set too low.
ACTION: Set the tamp air pressure regulator to 20-40 psi.
Possible Cause: Cylinder airflow control is set incorrectly.
ACTION: Review Section 5.4.1.
Problem: Label does not adhere properly
Possible Cause: Tamp-pad is not parallel to the product surface.
ACTION: Set the tamp pad so it can make parallel contact with the product by
adjusting the chassis yoke. See Step 4 in Section 5.4.1.
Possible Cause: Tamp dwell time set too low.
ACTION:
The tamp dwell time must be greater than 30 ms to extend the
cylinder. If the dwell time is less than 30 ms, increase the value no
more than 10 ms at a time. Adjust the dwell-time using the
procedure described in Section 5.4.2.
Possible Cause: Irregular product surface.
ACTION: Adjust the product orientation or the system orientation to apply labels
on a flat and solid surface of the product.
Possible Cause: Cylinder air pressure set too low.
ACTION: Adjust the tamp air regulator to 20-40 psi.
Possible Cause: Cylinder airflow control is set incorrectly.
ACTION: Review Section 5.4.1.