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A 2-2
Overview
2. Functional Operation
Startup Mode
Operating Mode
A2EN-02-[3-OVER]–2
The melter has three basic modes of operation: startup, operating, and
standby. Each heated component (each hose, each gun, and the tank) is
referred to as a zone.
There are two types of startup mode: cold startup and warm startup.
Cold Startup
When the melter is turned on, the control system checks the temperature
of all zones. If the controller detects that the temperature of any zone
that is turned on is more than 19 °C (35 °F) below its setpoint
temperature, the melter will perform a cold startup. First the tank and
hoses begin to heat. When the temperature of the tank and the hoses is
within 19 °C (35 °F) of the setpoint temperature, the guns begin to heat.
When all zones are within 3 °C (5 °F) of their setpoint temperatures, a
time delay begins. The time delay provides additional time for the
adhesive in the tank to melt. The default time delay setting for gear
pump melters is 46 minutes. At the end of the time delay, the green
SYSTEM READY light turns on to indicate that the system is ready for
operation and the parent machine interlock (PMI) (if used) is enabled.
Warm Startup
When the melter is turned on, the control system checks the temperature
of all zones. If the temperature of all zones that are turned on is within
19 °C (35 °F) of the setpoint temperature, the melter performs a warm
startup. Steady power is applied to each zone until the tank, hoses, and
guns are within 3 °C (5 °F) of their setpoint temperatures. When this
occurs, the green SYSTEM READY light turns on to indicate that the
system is ready for operation and the PMI (if used) is enabled. There is
no time delay during a warm startup.
When a gun is triggered, the pump draws in the melted adhesive and
pushes it through a manifold, filter, and hose to a dispensing gun. The
gun applies the adhesive to the product or package surface.
Figure A 2-2 shows the path that melted adhesive follows as it flows
through the system.
41-3000
Issued 11/00
E 2000 Nordson Corporation
All rights reserved
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