Nordson EFD 745NC User manual

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] [phone] 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] [phone] 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
4www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
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
5www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
Block Diagram of Circuit Operation Input Signal
Hold Voltage 5 VDC Spike Voltage 5 VDC
Spike and Hold
Driver Circuit
a
b
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
6www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
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
7www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
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
8www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
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.
2
1
3
4
5
2
1
3
4
5 6
7

Square Wave 745NC Non-Contact Dispense Valve
9www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
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.
2
1
3
4
5
7
6
7

Square Wave 745NC Non-Contact Dispense Valve
10 www.nordsonefd.com [email protected] [phone] 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

Square Wave 745NC Non-Contact Dispense Valve
11www.nordsonefd.com [email protected] [phone] Sales and service of Nordson EFD dispensing systems are available worldwide.
Troubleshooting Guide
Trouble Solution
No fluid flow If valve operating air pressure is too low, the valve
will not open. Increase air pressure to 4.8 bar (70 psi)
minimum.
The reservoir air pressure may not be high enough.
Increase pressure.
The valve stroke adjustment may be closed. Open
stroke adjustment.
Material may have clogged the fluid body or outlet
nozzle orifice. Clean the valve / nozzle plate.
Inspect cable wires from bullet solenoid to make sure
they are not loose or damaged.
Bullet solenoid may not be actuating. Replace
solenoid.
Steady drip A steady drip can be caused by a worn needle and
seat, or a particle holding the needle off the seat.
Clean and inspect the needle and seat for wear.
Replace worn or damaged parts.
Fluid leaks out
drain hole
Fluid leaking out the drain hole on the side of the valve
indicates that the spring energized fluid seal is worn.
Replace seal.
Inconsistent
deposits
Inconsistent deposits can result if the air pressure
controlling the valve and / or supplying the reservoir
is fluctuating or is less than 4.8 bar (70 psi). Check
that air pressures are constant and valve operating
pressure is 4.8 bar (70 psi).
The time the valve is open must be constant. Check
to be sure the valve controller is providing consistent
output.
If trouble cannot be corrected or if you need further assistance, please contact us.

For Nordson EFD sales and service in over
40 countries, contact Nordson EFD or go to
www.nordsonefd.com.
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800-556-3484; [phone]
[email protected]
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[email protected]
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The Wave Design is a trademark of Nordson Corporation.
©2021 Nordson Corporation 7028719 v012221
NORDSON EFD ONE YEAR LIMITED WARRANTY
This Nordson EFD product is warranted for one year from the date of purchase to be free
from defects in material and workmanship (but not against damage caused by misuse,
abrasion, corrosion, negligence, accident, faulty installation, or by dispensing material
incompatible with equipment) when the equipment is installed and operated in accordance
with factory recommendations and instructions.
Nordson EFD will repair or replace free of charge any defective part upon authorized return
of the part prepaid to our factory during the warranty period. The only exceptions are those
parts which normally wear and must be replaced routinely, such as, but not limited to, valve
diaphragms, seals, valve heads, needles, and nozzles.
In no event shall any liability or obligation of Nordson EFD arising from this warranty exceed
the purchase price of the equipment.
Before operation, the user shall determine the suitability of this product for its intended use,
and the user assumes all risk and liability whatsoever in connection therewith. Nordson EFD
makes no warranty of merchantability or fitness for a particular purpose. In no event shall
Nordson EFD be liable for incidental or consequential damages.
This warranty is valid only when oil-free, clean, dry, filtered air is used, where applicable.