Technical data

Troubleshooting
6-9
P/N 7135049A
E 2007 Nordson Corporation
VBC_Siemens
Others
Problem Possible Cause Corrective Action
Leakage at pump shaft seal
Pump shaft seal is worn Tighten the gland bolt
− Replace pump
Material pressure too low,
output quantity too low
Gear pump is worn Replace pump
Gear pump blocked Processed material too cold Correct temperature setting
(observe data sheet of material
manufacturer)
Foreign material in gear pump Replace pump
Leakage at gun during
heatup phase
Safety valve does not open
(expansion pressure)
Replace safety valve
Overflow protection
(option) is activated,
although level has fallen
below sensor
Overflow signal was not
acknowledged
As soon as the level falls below the
sensor, disconnect the level control
interface plug, wait 10 s and plug in
again.
Alarm caused by material residue
stuck to sensor
The sensor must be cleaned to
prevent material residue from
immediately triggering another
alarm.
Check rod probe performance.
Melter always switches to
the state Shutdown
One or more control components
on the CAN bus have failed
Check, replace if necessary
CAN bus terminating resistors not
connected properly
Terminate CAN bus on both ends
(Temperature control board −
motor controller or Temperature
control board − pressure sensor)
with resistance as shown in the
wiring diagram.
Control panel always
shows 0 (analog pressure
sensor)
No sensor is connected, and 0 volt
means ”no pressure.”
Connect sensor and assign on
control panel (Refer to section
Operation)