Nordson 3930 Manuale utente

E2000 Nordson Corporation

Issued 9/00 B3EN-03-[3-TANK]-3

Part B, Section 3

Tank and Manifold

This section covers the following unit configurations.

Model 3930

3960

Voltage 1, 2

Pump Piston (F)

AC gear (K or L)

DC gear (O, R, S, T, U, or W)

Manifold 4-Port (A or J)

6-port (B, C, K, L, O, or P)

2-port (R, U, S, or T)

Control MultiScan (3)

Tank and Manifold

B 3-0

E2000 Nordson Corporation

41-3000

Issued 9/00

B3EN-03-[3-TANK]-3

Tank and Manifold B 3-1

E2000 Nordson Corporation

Issued 9/00 B3EN-03-[3-TANK]-3

Section B 3

Tank and Manifold

WARNING: Allow only qualified personnel to perform the

following tasks. Follow the safety instructions in this document

and all other related documentation.

This section describes how to disassemble and reassemble the tank and

manifold. It also includes procedures for replacing the pressure relief

valve, drain valve, and, if applicable, the circulation control valve,

pressure control valve, or air-piloted pressure control valve.

Refer to the following sections for additional information on the tank and

manifold:

STechnical Data provides tank specifications, including the tank

capacity, the tank volume, and the dimensions of the tank lid

opening.

SOperation includes the procedure for filling the tank with adhesive.

SMaintenance includes procedures for flushing the tank and

manifold and for draining adhesive from the tank.

SControl System includes procedures for replacing the tank

resistance temperature detector (RTD) or thermostat.

SParts includes illustrated parts lists for the melter and all major

assemblies. Refer to this section for the part number of any

component that needs to be replaced.

1. Introduction

Tank and Manifold

B 3-2

E2000 Nordson Corporation

41-3000

Issued 9/00

B3EN-03-[3-TANK]-3

Before beginning any tank or manifold repairs, you should be familiar with

the major components of the tank.

The tank holds a supply of adhesive and melts it before it is pumped to

the hoses and guns. The tank is made up of a hopper, grid, and

reservoir. Figure B 3-1 shows the key parts of the tank.

4130644

Fig. B 3-1 Key Parts of the Tank (Series 3960 tank shown)

1. Hopper

2. Grid 3. Reservoir

4. Heater connectors

Hopper and Grid

The hopper holds a supply of adhesive. It is supported by the grid, which

connects the hopper to the reservoir. The grid melts the adhesive, which

then falls between blades and into the reservoir below. The grid has a

cast-in heating element. An RTD and overtemperature thermostat sense

the grid temperature and provide input to the control system.

Reservoir

The reservoir maintains the melted adhesive at application temperature

and directs it to the pump inlet. Like the grid, it has a cast-in heater and

an RTD and overtemperature thermostat that sense the tank temperature

and provide input to the control system.

2. Overview of the Tank

Tank

Tank and Manifold B 3-3

E2000 Nordson Corporation

Issued 9/00 B3EN-03-[3-TANK]-3

Because the tank and manifold have no moving parts, you should not

need to replace them. However, if you need to remove them from the

melter for any reason, follow these procedures. Refer to the Parts

section for the part numbers of any components that need to be replaced.

You can use the parts list illustrations as a guide as you perform the

following disassembly and reassembly procedures.

To replace both the tank and manifold, you must complete all of the

following procedures:

SPreparing to Replace the Tank or Manifold

SRemoving the Hopper

SRemoving the Grid

SDisassemlbing the Reservoir and Manifold

SReassembling the Reservoir and Manifold

SInstalling the Grid

SInstalling the Hopper

SRestoring the Melter to Normal Operation

These instructions can also be used to replace just one part of the tank

assembly.

Complete this procedure before you perform any tank repairs.

1. Heat the melter to operating temperature to aid disassembly and to

prepare for draining as much adhesive as possible from the tank.

2. Drain the tank. For information about different ways to drain the tank,

refer to Cleaning the System in the Maintenance section.

3. Piston pump and MPC melters: Turn the pump air pressure

regulator to 0; then disconnect the air regulator from the melter.

4. Remove the pump from the melter. Refer to the Pump section for the

pump removal procedure.

5. Turn off the melter; disconnect and lock out electrical power to the

melter at the branch circuit disconnect switch, and disconnect and

lock out electrical power supplied through any I/O wiring.

3. Tank and Manifold

Replacement

Preparing to Replace the Tank

or Manifold

Tank and Manifold

B 3-4

E2000 Nordson Corporation

41-3000

Issued 9/00

B3EN-03-[3-TANK]-3

Follow this procedure to remove the hopper from the melter.

1. If you have not already done so, complete Preparing to Replace the

Tank or Manifold.

2. Carefully remove all insulation from the hopper.

3. See Figure B 3-2. Remove the screws, nuts, washers, and lock

washers that attach the hopper (1) to the grid (3).

4. Carefully separate the hopper from the grid and set it aside.

5. Remove the O-ring (2) from the groove in the grid and discard it. You

should replace the O-ring any time the hopper is removed from the

grid. Refer to the Parts section for the O-ring part number.

4130711A

Fig. B 3-2 Removing the Hopper from the Grid

1. Hopper

2. O-ring 3. Grid

6. Check the gasket on top of the hopper. If it is not damaged, you do

not need to replace it.

Removing the Hopper

Tank and Manifold B 3-5

E2000 Nordson Corporation

Issued 9/00 B3EN-03-[3-TANK]-3

Follow this procedure to remove the grid.

1. Remove the melter’s front and back panels. To do so, you will need

Sremove the electrical enclosure lid

Sdisconnect any ground wires

2. Piston pump and MPC melters: See Figure B 3-3. Remove the

screws (2) that hold the air-line adapter (3) to the hose-end panel (1).

4130816

Fig. B 3-3 Removing the Air Line Adapter Screws

1. Hose-end panel

2. Screws 3. Air-line adapter

3. Remove the screws that attach the center front support bracket to the

left and right support brackets. Remove the center front support

bracket and then remove the left and right support brackets.

4. Remove the screws on the bottom of the hose-end panel. Swing the

panel and wire harness away from the melter.

Removing the Grid

Tank and Manifold

B 3-6

E2000 Nordson Corporation

41-3000

Issued 9/00

B3EN-03-[3-TANK]-3

5. See Figure B 3-4. Remove the RTD, thermostat, and ground wire

from the grid.

4130929A

ÎÎÎÎ

ÏÏÏÏÏ

ÎÎÎÎÎ

ÎÎ

ÎÎÎÎÎ

Fig. B 3-4 Removing an RTD and Thermostat (typical)

1. RTD 2. Retainer plate

6. Carefully remove the insulation from the grid.

7. Remove the screws, nuts, washers, and lock washers that attach the

grid to the reservoir.

8. Carefully separate the grid from the reservoir and set it aside.

9. Remove the grid insulator from the reservoir and set it aside.

Follow this procedure to remove the reservoir and manifold and to

disassemble them.

1. If the melter is attached to a support platform, remove any anchoring

bolts.

2. See Figure B 3-4. Remove the RTD, thermostat, and ground wire (if

present) from the tank.

3. Tilt the melter back at an angle to gain access to the base and

remove the screws and washers that attach the manifold to the base.

Return the melter to the level position.

NOTE: Ask an assistant to help you tilt the melter and support it while

you remove the screws and washers.

Removing the Grid (contd.)

Disassembling the Reservoir

and Manifold

Tank and Manifold B 3-7

E2000 Nordson Corporation

Issued 9/00 B3EN-03-[3-TANK]-3

4. Pull the tank and manifold away from the melter. The spacers

between the manifold and the base may come loose at this time. If

they do not, remove them by hand.

5. Disconnect the tank heater wires.

6. Carefully remove all insulation.

7. Remove the screws and washers that secure the manifold to the tank;

then separate the manifold from the tank.

8. Remove the two O-rings from the grooves in the manifold and discard

them. You should replace the O-rings any time the manifold is

separated from the tank. Refer to the Parts section for the O-ring part

number.

Follow this procedure to reassemble the reservoir and manifold and to

reinstall them on the melter.

1. Turn the reservoir upside down and place it on a flat surface.

2. See Figure B 3-5. Lubricate two new O-rings with O-ring lubricant

and place the O-rings in their grooves on the manifold.

4130830A

Fig. B 3-5 Installing New O-rings

3. Turn the manifold upside down and align it correctly on the reservoir.

NOTE: If the O-rings are lubricated, they will stay in the grooves

when you turn the manifold upside down.

Reassembling the Reservoir

and Manifold

Tank and Manifold

B 3-8

E2000 Nordson Corporation

41-3000

Issued 9/00

B3EN-03-[3-TANK]-3

4. Insert the manifold washers and screws in the bottom of the manifold

and tighten them finger tight only. Then tighten the screws in the

sequence shown in Figure B 3-6. Tighten the screws to

5.4–6.8 NSm(4–5 ft-lb).

4130604A

Fig. B 3-6 Correct Sequence for Tightening Manifold Screws

5. Turn the reservoir and manifold over so that the reservoir’s open side

is up and wrap the insulation around the reservoir and manifold. Use

high-temperature duct tape to secure the insulation.

6. Reconnect the heater wires to the reservoir heater connections.

7. Hold the spacers in place and attach the reservoir and manifold to the

base of the melter with the screws and washers removed earlier. It

may be necessary to tilt the melter to gain access to the bottom of the

base. Tighten the screws to 10.9–13.6 NSm (8–10 ft-lb).

NOTE: Be sure you do not pinch the heater wires when you are

securing the reservoir and manifold to the base.

NOTE: To ease assembly, you can cut the heads off of four M8

screws that are longer than the spacers (do not use the screws

supplied with the service kit). Loosely thread the cut screws into the

tapped holes in the bottom of the manifold. Slip the spacers over the

screws. This will keep the spacers in line until you are ready to install

the supplied screws. When you are ready to install the supplied

screws, remove the cut screws. Ask an assistant to help you tilt the

melter and support it while you replace the screws and washers.

8. Apply thermal compound to the RTD and thermostat and install them

on the side of the reservoir. Make sure the RTD retainer plate is

installed as shown in Figure B 3-4.

9. Reconnect the ground wire (if present) to the reservoir.

10. If the melter was attached to a support platform, anchor it to the

platform now.

Reassembling the Reservoir

and Manifold (contd.)

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