FlexSeam Dispensing System Customer Product Manual.pdf - 第37页

Flexseam Dispensing System 33 Part 1127900_01 E 2019 Nordson Corporation Problem Possible Cause Corrective Action 4. Bead not obvious Low input air supply Ensure that the input air pressure is greater than 5 bar (72.5 ps…

Flexseam Dispensing System

Part 1127900_01

E 2019 Nordson Corporation

Troubleshooting

Troubleshooting begins when the flow of adhesive from the applicator stops

or diminishes unexpectedly or when a control system alerts you of a problem

through an alarm or visual display. This section covers only the most

common problems you may encounter. If you cannot solve a problem with

the information given here, contact your local Nordson representative for

help.

For additional troubleshooting information, refer to the manuals provided with

the other equipment used in the hot melt system.

General Troubleshooting

Refer to this table for general system troubleshooting.

Problem Possible Cause Corrective Action

1. Applicator does not

heat

System power not on Verify that the system power is turned

on.

Loose electrical connection Verify that all electrical connections

(cordsets and cables) at the controller

and the applicator are secure.

Broken or missing electrical pins Check for broken or missing pins at all

electrical connections. Repair or replace

damaged components.

Applicator temperature setpoint

too low

Adjust the temperature setpoint as

necessary.

2. Applicator

underheats or

overheats

System in setback (standby)

mode

Take the system out of the setback

mode.

Applicator temperature

setpoints too low or too high

Adjust the temperature setpoints as

necessary.

Failed heater or RTD Check the applicator heater or RTD.

Refer to Checking the Applicator Heater

or Checking the Applicator RTD later in

this section.

3. Erratic bead width

(from part to part)

Lip size incorrect Change the lip size to the appropriate

diameter for the bead width.

Applicator too cold Adjust the temperature setpoint as

necessary.

Old PUR adhesive in system Clean or replace the lip, clean the

adhesive path, and/or replace the

module.

Adhesive leaking under the

syringe flange

Check the syringe seal and clean the

interface as needed.

Top of adhesive

syringe/cartridge plugged

Remove the cured layer of adhesive

from the top of the adhesive

syringe/cartridge.

Flexseam Dispensing System

Part 1127900_01

E 2019 Nordson Corporation

Problem Possible Cause Corrective Action

4. Bead not obvious Low input air supply Ensure that the input air pressure is

greater than 5 bar (72.5 psi).

Old PUR adhesive in system Clean or replace the nozzle, clean the

adhesive path, and/or replace the

module.

Applicator too cold Adjust the temperature setpoint as

necessary.

Change the lip to a larger size.

5. Bead width changes

on the part

Robot speed inconsistent Check the program speed settings.

Applicator position too high/low Check the program height settings

and/or check the height of the product.

6. No adhesive output Low or no input air supply Ensure that the input air pressure is

greater than 5 bar (72.5 psi).

No signal from robot Test the signal using the robot purge

switch. If the applicator purges, the

problem is in the robot. Refer to the robot

product manual to troubleshoot the

robot. If the applicator does not purge,

check the setup.

Solenoid connection lost Check the red light on the solenoid

valve. If the red light is not illuminated,

replace the solenoid.

Old PUR adhesive in system Clean or replace the lip, clean the

adhesive path, and/or replace the

nozzle.

7. Leaks at bleed hole

on module

Adhesive seal failure Replace the module.

Flexseam Dispensing System

Part 1127900_01

E 2019 Nordson Corporation

Check the Applicator Heater

NOTE: Cordsets for applicators with a platinum sensor are

customer‐supplied. Refer to other documentation as needed.

1. Disconnect and lock out electrical power to the system.

2. Disconnect the applicator cordset.

3. See Figure 13. Use an ohm meter to check the heater resistance and

continuity at the heater pins on the cordset:

S If you measure low resistance, the heaters are operating normally.

Return to the procedure that referenced this check.

S If you measure high resistance or if an open circuit is indicated, there

may be a broken wire, a loose connection, or a defective heater.

Continue to the next step.

Figure 13 Pin positions on the applicator cordset

4. Remove the appropriate cordset connector hood and inspect the heater

wiring. Make sure there are no broken wires or loose connections and

that the heaters are wired correctly.

S If any wiring problems are found, correct the problems and restore the

system to normal operation.

S If no wiring problems are found, the heater is probably defective.

Replace the heater.