Nordson EFD 745NC Manual de usuario

Square Wave 745NC Non-Contact Dispense Valve

Operating Manual

™

Electronic pdf ﬁles of Nordson EFD

manuals are also available at

www.nordsonefd.com

Square Wave 745NC Non-Contact Dispense Valve

2www.nordsonefd.com [email protected] +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.

Contents

The Nordson EFD Pledge

We pledge that you will be completely satisﬁed with our products. We endeavor to ensure that every

EFD product is produced to our no-compromise quality standards.

If you feel that you are not receiving all the support you require, or if you have any questions or

comments, I invite you to write or call me personally.

Our goal is to build not only the ﬁnest equipment and components, but also to build long-term customer

relationships founded on superb quality, service, value and trust.

Contents..........................................................................................................................................................................2

Introduction .....................................................................................................................................................................3

Speciﬁcations .................................................................................................................................................................3

Installation .......................................................................................................................................................................4

Valve Disassembly and Reassembly Procedures ...........................................................................................................8

Replacement Parts........................................................................................................................................................10

Troubleshooting Guide..................................................................................................................................................11

Tara Tereso, Vice President

Tara

Square Wave 745NC Non-Contact Dispense Valve

3www.nordsonefd.com [email protected] +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.

Introduction

The Square Wave™745NC high speed non-contact valve applies low-viscosity water soluble and

solvent-based liquid ﬂuxes in accurate, repeatable amounts on cell bus bars and solder-coated ribbon

used in cell string attachment.

Specifications

Dimensions: (24 W solenoid) 70.11 x 21.84 x 33.27 mm

(2.76 x 0.86 x 1.31")

(4 W solenoid) 80.48 x 21.84 x 33.27 mm

(3.17 x 0.86 x 1.31")

Minimum cycle time: 24 W solenoid — 2 ms (open and close once)

4 W solenoid — 6 ms (open and close once)

Maximum cycle time: 24 W solenoid — 15 ms (open and close once)

4 W solenoid — Continuous

Minimum dispensing frequency: 24 W solenoid — 50Hz

4 W solenoid — Continuous

Maximum dispensing frequency: 24 W solenoid — 500Hz

4 W solenoid — 150Hz

Maximum ﬂuid pressure: 6.8 bar (100 psi)

Actuating operating pressure: 4.8–6.2 bar (70–90 psi)

Electrical inputs: 24 VDC — 24 W

24 VDC — 4 W

Volume output: 101.6 μm (0.004") nozzle — 0.030 μL — 0.30 μL @ 0.345 bar (5 psi)

127 μm (0.005") nozzle — 0.040 μL — 0.48 μL @ 0.345 bar (5 psi)

Material with ﬂuid contact: Fluid body: Type 303 stainless steel

Shaft: 17-4 PH stainless steel

Ball cage: 303 stainless steel

Fluid seal: PTFE carbon ﬁlled type with 304 SS spring energized seal

Valve ball: Tungsten carbide

Valve seat: Cobalt stainless steel

Nozzle: Type 303 stainless steel with ruby insert

Fluid inlet thread: M5 x 0.8

Mounting: M4 x 0.7

Weight: 114 grams (4.02 oz)

Square Wave 745NC Non-Contact Dispense Valve

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Installation

1. Mount valve utilizing the M4 mount hole on actuation body.

2. Connect ﬂuid supply line to ﬂuid inlet ﬁtting using 0.125" ID tubing.

3. Connect ﬂuid supply line to reservoir.

4. Connect valve control air to a constant air source between 4.8–6.3 bar (70–90 psi).

The Square Wave 745NC valve is recommended to be actuated using a spike and hold driver circuit.

The valve requires a 24 VDC pulse for 1 ms minimum to actuate the valve. This is then reduced to

5VDC for the remaining period that the valve is open.

CAUTION

Failure to reduce the voltage will result in permanent damage to the actuation solenoid if the valve is left

on longer than 30 ms.

To avoid damaging the actuation solenoid, do not cycle the valve at continuous high frequencies for

periods greater than 30 minutes. The actuation solenoid requires periodic dwell time to protect coil

integrity and performance.

Signal parameters:

Minimum on time: 1 ms

Minimum off time: 1 ms

Spike voltage (supply): 24 VDC

Hold voltage: 5 VDC

High current magnitude: 1.0 Amp

Maximum hold current: 300 mA

Minimum operating frequency:

100Hz (see Figure #1 below for frequency/duty cycle capability of 24W valve)

Maximum operating frequency: 500Hz

Frequency

(Hz)

Duty Cycle

30% 40% 50% 60% 70%

100

150

200

250

300

350 n/a

400 n/a n/a

450 n/a n/a

500 n/a n/a n/a

Figure 1

Square Wave 745NC Non-Contact Dispense Valve

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Block Diagram of Circuit Operation Input Signal

Hold Voltage 5 VDC Spike Voltage 5 VDC

Spike and Hold

Driver Circuit

c d

Operation of a Spike and Hold Driver Circuit

a. The input signal source controls the valve actuation timing. The on-time, duty cycle, and

operating frequency of the valve are determined from the input signal. When the input signal is

low (0 VDC) the circuit is not energized. When the input signal goes high (5–24 VDC) the circuit

will energize the spike and hold driver circuit.

b. The spike and hold driver circuit controls which voltage is supplied to the valve. When the spike

and hold driver circuit receives a high input signal, the spike and hold driver circuit will apply the

spike voltage to actuate the valve. The spike and hold driver circuit will apply the spike voltage

from 1 to 30 ms before transitioning to the hold voltage.

CAUTION

Not using a spike and hold driver circuit as recommended may cause permanent damage to the

actuation solenoid.

c. The hold voltage should be set to 5 VDC to provide a safe voltage proﬁle to prevent permanent

damage to the actuation solenoid.

d. The spike voltage is set to 24 VDC for a minimum of 1 ms and no longer than 30 ms to actuate

the valve to its open state.

CAUTION

Failure to reduce the voltage will result in permanent damage to the actuation solenoid if the valve is left

on longer than 30 ms.

To avoid damaging the actuation solenoid, do not cycle the valve at continuous high frequencies for

periods greater than 30 minutes. The actuation solenoid requires periodic dwell time to protect coil

integrity and performance.

Important note: We recommend use of a Zener bi-directional diode to ensure 24 VDC spike

voltage dissipates quickly to maximize actuation solenoid performance.

(Step 5 starts on page 6)

Square Wave 745NC Non-Contact Dispense Valve

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5. Connect the 745NC Square Wave valve with a 4 watt solenoid to a

ValveMate™8000 controller.

*IMPORTANT NOTE: Only a 745NC valve installed with a 4 watt

solenoid can be used with the ValveMate 8000 controller.

a. Follow steps 1 through 4 on page 4.

b. Connect the 745NC valve to the ValveMate 8000 controller

using the solenoid wires supplied. See Figure 2.

NOTE: Installing the Dispense Valves

The ValveMate 8000 is supplied with an installation manual. The

manual will explain the operation of the ValveMate 8000 and input /

output connections for 745NC valve initiate.

6. Purge valve:

a. Set reservoir pressure to 0.275 bar (4 psi) as a minimum starting point.

b. Remove retaining nut to release nozzle plate.

c. Set valve stroke between 10–20 on reference ring.

d. Cycle valve at 50Hz minimum at 50% duty for purging.

CAUTION

CAUTION for 24 watt solenoid only: Minimum dispensing frequency is

50Hz. Operating frequencies lower than the minimum requirement will cause

solenoid failure.

e. Cycle valve until ﬂuid lines are free from air.

f. Replace nozzle plate / retaining nut onto valve.

7. Set desired ﬂow rate:

a. Set reservoir pressure to 0.275 bar (4 psi) as a minimum starting point.

b. Set valve stroke control to 1 hash mark (one click from zero) on stroke

reference ring as starting point.

c. Set frequency / duty cycle to 100Hz and 50% duty to establish initial

dispense volume. Adjust frequency/duty cycle to achieve desired ﬂow

rate.

NOTE: Refer to Figure 3 on opposite page as a guide for dispensing

volume as a function of frequency and ﬂuid pressure.

Figure 2

NOTE: Use the blue and

brown wires of the bullet

solenoid cable for BackPack

valve actuation. The wires are

not polarized.

Operation of a Spike and Hold Driver Circuit

Square Wave 745NC Non-Contact Dispense Valve

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Figure 3

Dispensing volume as a function of frequency and

pressure 101.6 μm (0.004") nozzle

Bullet solenoid

cable

NOTE: Use the blue and

brown wires of the bullet

solenoid cable for BackPack

valve actuation. The wires are

not polarized.

ValveMate 8000

Controller

Output to

Spike and Hold

Driver Circuit

24 VDC

To Alarm

Alarm

Electric

Fluid

Constant air

Air to tank

*Use with 4 W

solenoid only.

Square Wave 745NC Non-Contact Dispense Valve

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To replace piston and needle assembly

1. Remove (4) screws to release stroke control assembly.

2. Remove return spring.

3. With small pliers on spring pilot, pull piston and

needle assembly out of air cylinder.

NOTE: The piston and needle assembly is one unit

and cannot be disassembled.

4. With small pliers, remove U-cup seal.

5. Clean air actuation body wall. Replace with new U-cup seal,

ensuring that seal groove is facing upwards and expanded

fully in its groove.

6. Replace with new needle assembly. Insert into actuation

body, ensuring that piston seal is not damaged.

7. Reassemble the upper stroke control plate and secure

with (4) screws.

Valve Disassembly and Reassembly

Procedures

Before valve maintenance is performed, shut off valve

actuation and fluid air pressures.

To thoroughly clean fluid body and replace fluid seal

1. Remove nozzle retaining nut and nozzle plate.

2. Remove (4) screws and remove chamber plate.

3. Remove ﬂuid body from actuation body, and then remove spring-

energized PTFE seal.

4. Clean needle with cloth dampened in solvent.

5. Replace with new spring-energized PTFE seal and reassemble valve in

reverse order of disassembly.

5 6

Square Wave 745NC Non-Contact Dispense Valve

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Valve Disassembly and Reassembly

Procedures (continued)

To replace bullet solenoid

1. Remove spiral wrap (if used) around solenoid wires and air hose.

2. Unplug air line from valve.

3. Unthread the cable connector from the bullet solenoid.

4. Engage wrench ﬂats on bullet solenoid and rotate counterclockwise to

remove. When loose, pull bullet solenoid up slowly to release.

5. Place a light ﬁlm of PTFE grease on O-rings of new bullet valve.

CAUTION

Installing and threading solenoid into actuation chamber too quickly may

cause damage / breakage of O-rings, leading to air leaks and bullet solenoid

malfunction.

6. Install the replacement bullet solenoid by rotating the solenoid

clockwise until it is fully tightened.

7. Reconnect the bullet solenoid cable and the air line.

8. Turn air pressure ON.

Square Wave 745NC Non-Contact Dispense Valve

10 www.nordsonefd.com [email protected] +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.

Replacement Parts

Stroke control

assembly

7028724

Piston assembly

7028726

U-cup seal

Buna N

7028737

Fluid seal PTFE

7028727

Fluid body SS

7028729

Chamber

seat plate

7028728

Nozzle, 0.004" 7028731

Nozzle, 0.005" 7028732

Nozzle, 0.006" 7028733

Nozzle, 0.007" 7028734

Actuator body

7028735

Fluid inlet ﬁtting

7020671

Fluid body O-ring

Buna N

7028738

Bolts, M2 8X

7028736

Nozzle retaining nut

7028730

Air inlet ﬁtting

7361412

Bullet solenoid,

24V, 4 W, 3 pin

7361123

Bullet solenoid,

24V, 24 W, 3 pin

7361121

NOTE: Use the blue

and brown wires of the

bullet solenoid cable for

BackPack valve actuation.

The wires are not polarized.

Bullet solenoid cable,

3 pin, M8

7361124

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