PDF User Manual

Instruction Sheet

Part 331276B

02

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 2010 Nordson Corporation

P/N 331276B

02

Series EPC-30 Current-to-Pressure (I/P)

Transducer

WARNING! 

Allow only personnel with appropriate training and experience

to operate or service the equipment.  The use of untrained or inexperienced

personnel to operate or service the equipment can result in injury, including

death, to themselves and others, and damage to the equipment.

Introduction 

This instruction sheet contains the procedure for installing the

current-to-pressure (I/P) transducer (kit P/N 772033).

If the Eclipse

t

 EPC-30 pattern control is equipped with an optional

input/output (I/O) board, the I/P transducer can be installed to provide

run-up control for the system. Refer to the Eclipse EPC-30 pattern control

manual for setting the run-up control.

Specifications 

The following table lists specifications for the I/P transducer.

Item

Specification

Note

Air supply input pressure

8.6 

−

 10.3 bar (125 

−

 150 psi)

A

Air supply output pressure

0.2 

−

 8.3 bar (1 

−

 120 psi)

A

Input impedance

260 ohms (nominal)

Input signal

4 

−

 20 mA VDC

B

NOTE A: The transducer was calibrated using a 6.6

−

6.9 bar (95

−

100 psi) air supply.

B: With a 6.6

−

6.9 bar (95

−

100 psi) air supply, the output should be 0

−

0.3 bar (0

−

5 psi) with a 4 mA signal or

6.0

−

6.4 bar (87

−

93 psi) with a 20 mA signal.

Series EPC-30 Current-to-Pressure (I/P) Transducer

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I/P Transducer Installation 

Use this procedure to install the I/P transducer.

CAUTION!

 Mount the transducer with the UP arrow pointing directly up.

Mounting the transducer in any other position will change the

current-to-pressure ratio.

1. Use one of the following methods to mount the transducer-and-bracket

assembly within 30 feet of the hot melt unit’s pump. For the best

performance, mount the transducer as close to the pump as possible.

Make sure the UP arrow is pointing directly up.

S

If you are mounting the transducer on a wall or similar location, use
the mounting bracket.

S

See Figure 1. If you are mounting the transducer on a DIN rail, install

the two mounting clips in the top two bracket holes and attach the

clips to the DIN rail.

5742120A

Figure 1 Mounting the transducer on a DIN rail

1. DIN rail
2. Mounting clips

3. Bracket

2. See Figure 2. Install the two 

1

/

4

 NPT elbows from the kit in the

transducer’s air inlet and outlet ports.

Series EPC-30 Current-to-Pressure (I/P) Transducer

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3. Use 

5

/

16

-in. diameter (minimum) air line tubing to connect a clean, dry

air supply to the transducer air inlet port.

4. Connect 

5

/

16

-in. diameter (minimum) air line tubing between the

transducer’s air outlet port and the hot melt unit.

5. Set the hot melt unit’s air pressure regulator at the maximum setting

(turn the regulator fully clockwise).

6. Route the transducer cable to the Eclipse EPC-30 pattern control. Refer

to the Eclipse EPC-30 pattern control manual for instructions on:
A. Connecting the transducer cable to the pattern control unit

The transducer cable wire color code information

:

S

natural lead wire is common or negative

S

black lead wire is positive

B. Setting up and using the run-up control

5742119A

1

3

2

5

6

4

Figure 2 Transducer connections

1. Eclipse EPC-30 pattern control
2. Transducer cable

3. Elbow (air inlet port)
4. Elbow (air outlet port)

5. Air line tubing (air supply to

transducer)

6. Air line tubing (transducer to unit)

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Troubleshooting 

The following troubleshooting guide allows for a quick check in the field to

help reduce down time. For additional troubleshooting information, refer to

the manuals provided with the other equipment used in the hot melt system.

If you cannot solve a problem with the information given here, contact your

local Nordson representative for help.

Pneumatic Section 

The pneumatic section of the transducer consists of three basic parts. See

Figure 3.

A. Pilot section
B. Diaphragm set
C. Inlet

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Figure 3

Pneumatic components of the transducer

  1. Orifice assembly

2. Zero and span protector assembly
3. Strain relief
4. Protector diaphragm assembly

5. Spring
6. Spacer
7. Control diaphragm assembly
8. Half ball

9. Body assembly

10. In port

11. Gauge port

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Troubleshooting the Pneumatic Section 

NOTE:  

If the diaphragm fails, the transducer will leak internally.

Problem

Possible Cause

Corrective Action

Supply air on and the signal is set

to 4 mA

S

Make sure that the air supply is
clean and oil free

Diaphragm failure

No output regardless of the input

signal

clean and oil free

S

Unplug the bleed orifice screw

S

Unblock the bleed orifice screw

Diaphragm failure

Sluggish response to an input

signal

S

Unblock the bleed orifice screw

Bleed orifice screw may be

plugged or partially blocked

Electronic Section 

The electronic section of the transducer consists of three basic parts. See

Figure 4.

A. Magnet
B. Coil/flexure assembly
C. Circuit board

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Figure 4

Electrical components of the transducer

  1. Bonnet

2. Magnet
3. Coil/spring assembly

4. Circuit board assembly
5. Orifice assembly
6. Zero and span protector

assembly

7. Strain relief
8. Gauge port
9. Housing assembly

10. Rain sheild assembly

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Troubleshooting the Electronic Section 

Use a multi-meter with both continuity and resistance to troubleshoot the

transducer’s electronic section. Follow the sequence below:

1. Connect the test leads to the black and white leads on the transducer

and check for continuity.

2. Check the initial resistance, then turn the 

SPAN 

potentiometer either

clockwise (CW) or counter clockwise (CCW). The resistance will change

and should be in the range of 150

−

250 ohms.

NOTE:  

If you have continuity and the resistance changes when you turn

the 

SPAN

 potentiometer, the electronic section of the transducer is in good

working order.

Basic Calibration 

ZERO Adjustment 

The 

ZERO 

adjustment potentiometer is located on the front of the

transducer. For mechanical adjustment of the nozzle, adjust the 

ZERO

potentiometer settings.

For forward acting transducers:

S

turning the settings CW decreases the output pressure on the 

ZERO

and 

SPAN 

adjustments.

S

turning the settings CCW increases the output pressure on the

ZERO 

and 

SPAN 

adjustments.

NOTE:  

If the 

ZERO 

potentiometer is turned CCW, the nozzle moves closer

to the coil/flexure assembly via a worm and pinion gear assembly. If the

nozzle contacts the coil/flexure damage may occur. If the pitch on the zero

assembly is okay it does not need any adjustment.

Series EPC-30 Current-to-Pressure (I/P) Transducer

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SPAN Adjustment  

The 

SPAN

 adjustment potentiometer is located on the front of the

transducer. It is used to set the maximum pressure output. The minimum

and maximum pressure outputs must be checked each time an adjustment

is made. Follow these steps to calibrate the transducer:

1. Set the input signal to 4 mA.
2. Adjust the 

ZERO 

potentiometer until a proper setting is attained.

3. Set the input signal to 20 mA.
4. Adjust the 

SPAN 

potentiometer until a proper setting is attained.

5. Repeat steps 1

−

4 until the transducer is calibrated.

Field Troubleshooting 

1. Verify that the supply air pressure is higher than the maximum output

pressure and the supply air is free to flow to the transducer.

2. Cycle the transducer from 4

−

20 mA several times and observe the

pressure output.

3. Apply 4 mA to the transducer and disconnect one or both of the leads.

After reconnecting the leads, make sure that there is a slight metallic

sound. This sound is caused when the coil jumps in the magnet, and it

indicates that the transducer has continuity.

4. Examine the 

SPAN 

potentiometer. If it does not show signs of damage,

then the electronic portion of the transducer is in good working

condition.

5. Apply 4 mA to the transducer and turn the 

ZERO 

potentiometer either

CW or CCW until the output pressure is 2 psi. The total deflection of the

coil from 4

−

20 mA is about .002”.

NOTE:  

If the 

ZERO 

potentiometer is turned CW (causing the nozzle to

move away from the flexure) to a point where the nozzle bottoms out

(approximately 1.00” away from the coil/flexure), it will take 30

−

50 turns

in the CCW direction before the pressure starts to climb.

Series EPC-30 Current-to-Pressure (I/P) Transducer

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Parts 

To order parts, contact the Nordson Customer Service Center or your local

Nordson representative. Use the following parts lists to describe and locate

parts correctly. See Figure 5.

Item

Part

Description

Quantity

Note

—

772033

Service kit, transducer, current-to-pressure

—

1

326947

S

Mounting clip, 35 mm DIN rail

2

2

101695

S

Transducer, current-to-pressure, 4

−

20 mA,

3

−

90 psi

1

A

3

332747

S

Screw, hex-head, slotted, w/lock washer, 

M4 x 8 mm

2

4

334875

S

Elbow, male, 

5

/

16

 in. tube x 

1

/

4

 NPT

2

5

900739

S

Bushing, strain relief, 

1

/

2

 NPT

1

B

6

155197

S

Cable, 2-conductor, shielded, 30 ft

1

B

NOTE A: This transducer includes a preassembled mounting bracket.

B: The cable and strain relief bushing are preassembled on the transducer.

5742121A

6

5

1

2

3

4

Figure 5 Transducer service kit parts

Issued 08/10

Original copyright date 1999.  Nordson and the Nordson logo are registered trademarks of Nordson Corporation.