Troubleshooting
6-2
Part 1120277_01
E 2012 Nordson Corporation
Melter Faults
Table 6 -1 lists the four types of melter faults, potential causes, and expected
corrective actions.
Table 6-1 Melter Faults
Display
Code/Sub-code
Name Affect on Melter Cause Corrective Action
F1/None RTD Heaters turn off
The RTD for the
component indicated
has failed or the
component was
disconnected from
the melter.
Replace RTD
Check hose/gun
connections
See flowchart T.2
F2/None
Under
temperature
Heaters turn off
The actual t emperature
of the component
indicated has dropped
below the under
temperature delta,
which was set using
parameter 22.
Check for conditions
that may cause a drop
in ambient temperature
Replace RTD
See flowchart T.2
F3/None Over temperature Heaters turn off
The actual t emperature
of the component
indicated has increased
beyond the over
temperature delta, set in
parameter 21.
Change parameter 21. If
the problem persists,
replace the RTD.
See flowchart T.2
F4/1 RAM test
Melter stops
functioning
Internal RAM failure Replace CPU
F4/2
Internal Clock
time
Heaters remain on,
but fault condition
persists
Internal clock failure Replace CPU
F4/3
RAM backup
battery
Clock does not
function
Insufficient voltage from
RAM backup bat tery
Replace CPU
F4/4
Internal clock
battery backed
RAM
Heaters remain on,
but fault condition
persists
Battery-backed R AM
failure
Replace CPU
Continued...
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