Filling Valve (Option) - Nordson VersaBlue VBN 50 Manual

6-6
Troubleshooting

Filling valve (option)

Problem
No material
Filling valve does not heat
Filling valve does not reach
set temperature
Solenoid valve does not
switch
Others
Problem
Leakage at pump shaft seal
Material pressure too low,
output quantity too low
Gear pump blocked
Leakage at gun during
heatup phase
Overflow protection
(option) is activated,
although level has fallen
below sensor
P/N 7146386A
Possible Cause
No compressed air to control
module or compressed air set too
low
Control module defective
Temperature not set
Plug not connected
Temperature sensor(s) defective
Heater cartridge(s) defective
Solenoid valve is not triggered or is
defective
Possible Cause
Pump shaft seal (VarisealR) is
worn
Pump shaft seal is worn
−
Gear pump is worn
Processed material too cold
Foreign material in gear pump
Safety valve does not open
(expansion pressure)
Alarm caused by material residue
stuck to sensor
VBN w/o Control System
Corrective Action
Connect compressed air and set to
correct value
Replace control module
Set on temperature controller of
VersaBlue melter or on filling unit
Regulating via VersaBlue
Connect to corresponding hose
receptacle
Regulating via filling unit
Connect to hose receptacle
Replace
Replace
Trigger via customer's PLC or
replace solenoid valve
Corrective Action
Replace pump shaft seal
When present: Retighten gland
Replace pump
Replace pump
Correct temperature setting
(observe data sheet of material
manufacturer)
Replace pump
Replace safety valve
If overflow protection is triggered,
the fault must be acknowledged.
As soon as the level has fallen
below the sensor, it must be
cleaned to prevent material residue
from immediately triggering another
alarm.
E 2008 Nordson Corporation