Piston Pump Troubleshooting Guide - ITW Dynatec DYNAMINI Operation And Service Manual

Page 7-10
Revised 1/05

Piston Pump Troubleshooting Guide

Some of the procedures in the following Troubleshooting Guide require working
near hot adhesive. Be sure to wear protective gloves, safety glasses and clothing
and use proper tools for handling hot melt components.
Problem
Pump Will Not Stroke
Relief
Valve
Regulator
Air Tubes
Solenoid
Air fittings
Air
valve
WARNING
HOT SURFACE & ADHESIVE
Possible Cause
1. No air pressure.
2. 3-way solenoid valve is
closed.
3. Fault in compressed air
fitting on ASU.
4. Hopper temperature
not ready.
5. Inoperative air valve (on
back end of pump air
cylinder).
6. Inoperative air cylinder
4-way solenoid valve.
7. System is not ready.
ITW Dynatec c. 2004
DYNAMINI ASU Manual #20-25
Solution
1. Verify system has been provided
with at least 0.5 SCFM of air at
20-100 PSIG (.014 std. cubic meters/
minute at 6.8 bar).
2. Verify that valve is properly con-
nected (electrically) inside ASU.
Verify that valve is properly con-
nected to Air Control/ Filter Unit.
Disconnect valve electrical leads
and verify that air is passed through
when 240 VAC is applied to the
valve terminals. Replace valve if
defective.
3. Inspect the system for improper
connections, loose tubing or fit-
tings, or kinked tubing. Repair or
replace tubing or fittings as
necessary.
4. Air valve cannot pass air until hopper
has reached setpoint window. Wait until
this has occurred. Check also the
programming of the ready time delay.
The default for this is "0".
5. Remove air valve from pump.
Inspect, clean and repair as neces-
sary.
6. Remove 4-way valve. Inspect,
clean and repair as necessary.
7. Wait until temperature scale (F/C) light
is steady ON (not flashing).