Description
2-5
Part 1120277_01
E 2012 Nordson Corporation
Modes of Operation
PURBlue 4 high-output melters operate in the following modes:
Automatic scan — The melter automatically checks and displays the
current temperature of the reservoir, hoses, and guns to confirm that they are
within their pre-defined temperature range. By default, the melter is always in
the automatic scan mode unless it is placed into another operating mode.
Melt-on-demand — The melter automatically melts the amount of adhesive
needed from the foil wrapped slug to keep the 0.5-kg reservoir full. When the
melt-on-demand sensor detects that the reservoir is not full, the melt plate
(grid) turns on and the pneumatic cylinder applies downward force (as set by
the melter air regulator) on the slug. When the melt-on-demand sensor
detects that the reservoir is full, the melt plate turns off and the cylinder force
is removed.
NOTE: To prevent unnecessary heating of PUR adhesive, the melter may
enter the standby mode in the following ways:
S If the melt plate is off for too long, the control system determines that
it is no longer in use and sets the system to standby. This time is
determined by parameter 24, Automatic Standby Timeout.
S If the melt plate is on for too long, the control system determines that
the MOD sensor has failed and sets an S1Cal condition, which places
the unit in standby. This time is determined by parameter 49,
PUR Timer.
Standby — The temperatures of the reservoir, hoses, and guns are reduced
down from their operating temperature (hereafter referred to as setpoint
temperature) by a preset number of degrees and the melt plate, which is
controlled by the melt-on-demand sensor, is turned off.
Setup — The setup mode is used to configure melter control options and
features and to review stored operating data. To prevent unauthorized
changes to the melter's configuration, the melter can be password-protected.
Fault — The melter alerts the operator when an abnormal event occurs. For
a list of faults and their impact, refer to Melter Faults in Section 6,
Troubleshooting.
Manual and gear-to-line — The melter allows you to manually set the
adhesive output rate or the melter can automatically adjust the adhesive
output based on production requirements.
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