ITW Dynatec DynaFiber UFD - Chapter 6 Troubleshooting; Hot melt is coming out of the module’s “weep” holes.; Applicator is too hot; Application pattern is erratic

ITW Dynatec
Chapter 6
Troubleshooting
Page 52 UFD Applicator, Manual 40-43, Rev. 6.16
Problem Possible Cause Solution
Hot melt is coming out of the
module’s “weep” holes.
1. Module seals are
damaged.
1. Replace seal cartridge or
module, see instructions in
Ch. Maintenance.
Applicator does not reach
operating temperature
1. Hopper temperature
setpoint is too low.
2. Heater cartridge defective.
3. Temperature sensor
defective.
1. Change setpoint, see ASU
manual.
2. Check/ replace heater
cartridge, see instructions in
Ch. Maintenance.
3. Check/ replace sensor, see
instructions in Ch.
Maintenance.
Applicator is too hot
1. Applicator temperature
setpoint is too high.
2. Temperature sensor
defective.
1. Change setpoint, see ASU
manual.
2. Check/ replace sensor, see
instructions in Ch.
Maintenance.
Air escapes from module
1. Piston O-ring defective.
2. O-rings located between
module and service block
are defective.
1. Replace O-ring, see
instructions in Ch.
Maintenance.
2. Remove module from block
(see instructions in Ch.
Maintenance) and replace O-
rings.
Application pattern is erratic
1. Adhesive pressure is too
low.
2. Adjust pattern controller.
1. a. For units without speed
control: increase adhesive
pressure at ASU.
b. For units with speed control
(tach follower): adjust pump
speed control.
2. See pattern controller manual
for proper adjustment.