AltaPail II Bulk Melters Product Manual - 第30页

1 2 Principle drawing Introduction 2-7 Part 1121836_03 E 11/2014 Nordson Corporation Heating and Temperature Control The bulk melt er electronically co ntrols the temperatu re of various components of the bu lk melter it…

Air

Deaerate

Aerating

Compressed Air

Introduction

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Function / Concepts

Raising and Lowering Platen

The pneumatic cylinders raise and lower the platen. When lowering the

platen, a two-hand control must be operated for safety reasons until the

platen is in the container. The selector Raise/lower platen then lights up

green.

Deaerating Container

The air relief valve must be opened manually to allow air to escape when the

platen is lowered into the container.

Aerating Container

To prevent a vacuum from forming when the platen is lifted out of the

container, the container must be aerated manually.

Platen Position

WARNING: Risk of squash! Make sure that switch 1 is not actuated until the

platen is inside the container.

A switch rod activates the switches (1 and 2) one after the other, triggering

the following switching functions:

Switching functions when lowering:

Switches from two-hand lowering mode to normal lowering mode

when the platen sealing ring is completely submerged in the container

(switch 1)

Activates the Container empty indication (switch 2).

Switching functions when raising:

Switches off container aeration (switch 1).

1 2

Principle

drawing

Introduction

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Heating and Temperature Control

The bulk melter electronically controls the temperature of various

components of the bulk melter itself (e.g. heating punch) as well as

connected components of an entire application system.

Over temperature shutdown

The over temperature shutdown feature protects the bulk melter and the

material from overheating. For over temperature shutdown, the heater and

motor are switched off.

Under temperature Interlock

The under temperature interlock prevents the bulk melter motor from being

switched on as long as the material is too cold and thus too thick. This could

damage the pumps.

Standby

Standby serves to protect the hot melt material and to save energy during

breaks in production. The temperature set points are reduced by a standby

value.

Melting Process and Material Flow

The material is melted only directly below the melting plate. A pump feeds

the melted material to the hose connection.

Safety Valve

A safety valve (2) limits the material pressure generated by the pump (1).

The standard safety valve (2) is fixed at

100 bar 10000 kPa 1450 psi

When the pressure is exceeded, the safety valve opens, allowing the

material to circulate within the adapter plate.

Material Pressure

Pressure Control Valve

The mechanical pressure control valve can be manually adjusted up to

75 bar 7500 kPa 1100 psi

Also refer to page 4-8, Setting Material Pressure.

Introduction

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Modes

AltaPail bulk melters operate in the following modes:

Normal Mode (Auto Scan)

When the bulk melter is first switched on, it is in normal mode. In normal

mode the bulk melter checks the current temperature of the platen, the hoses

and the applicators to verify that they are within the set temperature ranges.

Standby

The temperatures of the platen, the hoses and the applicators are lowered

from their operating temperature (hereafter referred to as set point

temperature) by a set number of degrees.

Fault

The bulk melter alerts the user when a fault occurs, e.g. a sensor fault (RTD)

or a temperature that is not within the permitted range.