MUS01210202
07/01/2020
MELTON, S.L.U. - POLIGONO INDUSTRIAL AGUSTINOS CALLE G-34,31160 ORCOYEN, NAVARRA
TEL: 00 34 948 321580 Fax: 00 34 948 326584 e-mail: melton@melton.es
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4.1. INTRODUCTION:
The following adjustments should be made before the machine is switched on or
while it is working. They will ensure that the machine works properly and safely.
4.2. TEMPERATURE CONTROL:
4.2.1. Introduction:
The temperature of the tank, hoses and guns in the Hot
– Melt application
equipment is regulated by a digital electronic device controlled by microprocessor.
Regulation is proportional, with factory-set parameters for the separate heating
inertias of the tank, hoses and guns.
The temperature is measured by the RTD sensor on each of the heating devices.
These can be programmed individually and on each output channel between 30º - 240º
C (86ºF
– 464ºF).
The range ability (measurement range) of the controller is between -25ºC(-13ºF)
and 240ºC(464ºF).
Below -10 °C(40oF), the equipment will display a probe short circuit fault. Above
220 °C(454oF), the display will report on an open probe fault.
4.2.2. Brief description of how the unit operates:
The unit is equipped with proportional temperature control for the heating
resistances connected to 2 double hose-gun channels and a special channel for heating
the tank, with menus to access parameter programming and control of the operating
clearance for the main machine, alarms and different operating functions (PUMP,
ENERGY SAVING, etc.), which will be described later.
The control panel includes a 10-digit display with 7 ultra-bright segments showing
the uni
t’s operating data, plus the alarms that are produced by the sensor signals. There
are also LEDS displaying heating resistance output status, pressure pump, overheating
alarms, safety and energy saving status.
Preheat function:
Because the heat inertia of the glue tank is much greater than for all the
peripheral devices, these devices reach the programmed temperature much earlier than
the tank. This rapid heating process has an ageing effect on resistances and insulation.
This phenomenon also creates excessive fluid pressure in the hoses.
To offset this problem, the unit has been fitted with a preheat system that heats
all the peripheral devices (hoses and guns) in a sequential manner, while the tank is
heated at normal speed. When the tank reaches 75% of the programmed temperature,
heat is supplied to the hoses. When the hoses reach 75% of the programmed
temperature, heat is supplied to the guns.
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