Nexen WEB CONTROL EN40 User manual

FORM NO. L-20097-F-0605
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WEB CONTROL PRODUCTS
User Manual
Electro-Pneumatic Transducer
EN40
FORM NO. L-20097-F-0605

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FORM NO. L-20097-F-0605
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this
manual are subject to change without notice. Technical data listed in this manual are based on the latest information
available at the time of printing and are also subject to change without notice.
Technical Support: 800-843-7445
[phone]
www.nexengroup.com
Copyright 1999 Nexen Group, Inc.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
Read this manual carefully before installation and operation.
Follow Nexen's instructions and integrate this unit into your system with care.
This unit should be installed, operated and maintained by qualified personnel ONLY.
Improper installation can damage your system or cause injury or death.
Comply with all applicable codes.
DANGER

FORM NO. L-20097-F-0605
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TABLE OF CONTENTS
Introduction ----------------------------------------------------------------------------------------------------------- 4
Installation ------------------------------------------------------------------------------------------------------------ 4
Electrical Connections --------------------------------------------------------------------------------------------- 5
Air Line Connections ----------------------------------------------------------------------------------------------- 6
Adjustment ----------------------------------------------------------------------------------------------------------- 7
Maintenance --------------------------------------------------------------------------------------------------------- 8
Troubleshooting ----------------------------------------------------------------------------------------------------- 8
Parts List -------------------------------------------------------------------------------------------------------------- 8
Product Numbers --------------------------------------------------------------------------------------------------- 9
Warranty -------------------------------------------------------------------------------------------------------------10

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FORM NO. L-20097-F-0605
INTRODUCTION
FIGURE 1
Nexen’s EN40 Electro-Pneumatic Convertor converts current input signals into corresponding pneumatic signals.
Normally the “EN40” is used as part of a Nexen Tension Control System, or as an independent Electro-Pneumatic
Convertor, controlled by an external signal from a Process Controller.
EN40 is designed to balance the force of a moving coil with the force of a poppet valve, and amplify the air flow and
pneumatic pressure passing through a fixed orifice by means of the booster relay . Pneumatic pressure proportional
to the electric signal is thus obtained.
When current flows through the moving coil, a downward force is induced proportional to the current value. This
reduces the clearance between the poppet and seat, and back pressure rises. Since back pressure force must
balance with the moving coil force, a back pressure proportional to the current value results (See Figure 1).
This back pressure is too low to be used as an output, but, is used as the pilot pressure for the Booster Section,
which increases both pressure and volume to provide a usable output.
INSTALLATION
NOTE: “EN40” must be mounted vertically within
±15° in a shock and vibration free area. Locate
“EN40” as close to controlled element as possible
to guarantee quick precise control (See Figure 2).
Read this manual carefully. Make use of its instructions
and explanations. Pay particular attention to all NOTES,
CAUTIONS, and WARNINGS to avoid the risk of
personal injury or property damage. The “Know How”
of safe, continuous, trouble-free operation depends on
the degree of your understanding of the system, and
on your willingness to keep all parts in proper operating
condition.
FIGURE 2
WALL MOUNTING
1. Drill two 9/32 diameter holes 4.57 inches
(166mm) apart in mounting panel.
2. Secure “EN40” to mounting panel using Cap
Screws provided in parts bag.
Permanent
Magnet
Moving Coil
Poppet
Seat
Pilot Pressure
Chamber
Booster
Output
Spring
Plate
Fixed
Orifice
Air In
Panel
Bolts
±15°

FORM NO. L-20097-F-0605
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ELECTRICAL CONNECTIONS
1. Remove cover from EN40, then remove
WARNING Tag “INPUT” terminals (See Figure 7.)
CAUTION
Always short “INPUT” terminals when
transporting or storing “EN40.”
2. Using customer supplied 18AWG wire, connect
EN40 to controller (See Figure 8), routing wire
through threaded conduit hole on side of “EN40.”
CAUTION
Always observe polarity of terminals.
FIGURE 7
BASE MOUNTING
1. Remove “EN40” Wall Mounting Bracket.
2. Secure “EN40” to base using Brackets and M5
Cap Screws provided in parts bag (See Figure 3.)
FIGURE 3
MANIFOLD MOUNTING
1. Remove “EN40” Wall Mounting Bracket.
2. Plug “INLET” and “OUTLET” ports with Plugs
provided in parts bag.
3. Remove Plugs from underside of EN40 and install
O-rings provided in parts bag (See Figure 4).
4. Secure “EN40” to Manifold using Brackets and
M5 Cap Screws provided in parts bag (See Figure
5 & 6).
FIGURE 4
FIGURE 5
FIGURE 6
Remove
Plugs &
Install
O-rings.
Remove
WARNING
Tag.
4.645
[118]
5.04
[128]
0.48
[12.2]
2.638
[67]
1.319
[33.5]
[4] Brackets &
[4] 5mm Screws
Provided (or use
[4] #10 Screws)
125
MANIFOLD
PLUG
2 Provided
2.362
[60]
OUT
0.250
[6.35] Dia. Max.
IN
0.250
[6.35]
Dia. Max.
0.13
[3.3]
1.57 [39.9] Min. should be maintained
when installing two or more converters.
OUTPUT
EN40-IS
IN
SUPPLY
OUT
MANIFOLD

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FORM NO. L-20097-F-0605
FIGURE 8
AIR LINE CONNECTIONS
Nexen’s EN40 requires clean, pressure regulated air for maximum performance and long life. Nexen offers a filter
that is ideally suited for the needs of the EN40 (See PRODUCT NUMBERS section).
A pre-filter, rated at 5.0 micron or less is used to remove large particles from the air supply. The coalescing filter,
rated at .1 micron or less, is then used to final filter the air before it enters the EN40 (See Figure 9).
NOTE: Airline lubricators must be installed after EN40.
FIGURE 9
AIR IN PRE-
FILTER COALESCING
FILTER
EN40
IN OUT BRAKE
OR
CLUTCH
A+B+C=30 ft. long max.
1/4" Dia.
+
_
4 - 20ma. CURRENT LOOP
15V/750 +SIGNAL
SIGNAL COMMON
EN40

FORM NO. L-20097-F-0605
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ADJUSTMENT
Nexen’s EN40 has been factory adjusted and should
not require further adjustment with appropriate supply
pressure (See Table 1).
NOTE: If less than rated pressure is available for
“Psup,” the output of the EN40 will be proportionately
lower.
EN40 is available in four models. The model designation
can be found on the serial number tag, located on the
front of the EN40. If adjustment is required, determine the
model and refer to Table 1 for the correct values called
out in the adjustment procedure.
TABLE 1
ZERO ADJUSTMENT
1. Remove Gauge Port Plug and install a suitable air
pressure gauge.
2. Apply Imin input signal (See Table 1).
3. Remove Zero Adj. cover from “EN40.”
4. Using a screwdriver, adjust “EN40” output to
Pmin(rotate clockwise to increase, counter
clockwise to decrease) (See Figure 12).
NOTE: Do not adjust pressure to “0” psi. There must
be positive pressure at the poppet and seat.
5. Replace Zero Adj. cover.
FIGURE 12
Rotate to adjust
output to “Pmin”.
zero
gauge
GAUGE PORT
SPAN ADJUSTMENT
NOTE: Supply pressure must be Psup.
1. Perform ZERO ADJUSTMENT (previous
section).
2. Apply Imax input signal (See Table 1).
3. Remove Top Cover from “EN40.”
4. Using a screwdriver, adjust Span Pot to obtain
Pmax output (See Figure 13).
NOTE: Repeat “ZERO ADJUSTMENT” & “SPAN
ADJUSTMENT” to ensure settings have not drifted
during calibration.
FIGURE 13
Span Pot
5. Remove air pressure gauge and install plug.
6. Replace Top Cover.
Model EN40-1B EN40-2B EN40-1A EN40-1D
Imin
(mADC)
4 10 4 4
Imax
(mADC)
20 50 20 20
Pmin (psi) 1.5 1.5 1.5 1.5
Pmax (psi 85 85 57 15
Psup (psi) 100 100 71 20

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FORM NO. L-20097-F-0605
MAINTENANCE
FIGURE 15
There is no scheduled maintenance required for Nexen’s EN40 Electro-Pneumatic Convertor.
TROUBLESHOOTING
OPERATIONAL CHECK
1. Remove Gauge Port Plug, and install a suitable
air pressure gauge.
2. Apply Psup to inlet port (See Table 1).
CLEANING FIXED ORIFICE
NOTE: If dirt or foreign particles are present in Fixed
Orifice, check condition of Pre-filter and Coalescing
filter. These filters must be kept clean and properly
maintained to prevent clogging of Fixed Orifice.
1. Remove Fixed Orifice Housing (See Figure 14).
2. Remove O-ring and Orifice Plate (See Figure 15).
3. Clean Fixed Orifice Housing Air Passage.
4. Passing a thin wire through hole in Orifice Plate,
clean Orifice Plate Air Passage.
CAUTION
Do not use cleaning solvents to clean o-
rings. Clean o-rings with a clean dry cloth,
then apply a thin coat of o-ring lubricant
to the o-rings.
5. Install Orifice Plate and clean O-rings into Fixed
Orifice Housing.
6. Install Orifice Housing onto EN40.
FIGURE 14
PARTS LIST
3. Vary electrical signal to “EN40” within the range of
4-20mA, DC.
a) If pressure does not vary directly with signal,
reverse electrical leads.
b) If pressure is slow to react to changes in
signal, clean Fixed Orifice.
Fixed
Orifice
Housing
O-ring
Orifice
Plate
Item Description EN40-1A EN40-1B EN40-2B EN40-1D
1 Upper Diaphragm Assembly 2720 2720 2720 2720
2 Lower Diaphragm Assembly 2721 2722 2722 2723
3 Orifice Plate 2662 2662 2662 2662
4 Coil Assembly with Poppet 2666 2666 2666 2666

FORM NO. L-20097-F-0605
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PRODUCT NUMBERS
Model Product Numbers Output Pressure Input Signal
EN40-1D 912001 10–100 kPa [1.5–15 psi] 4–20 mA
EN40-2B 912004 10–586 kPa [1.5–85 psi] 10–50 mA
EN40-1B 912028 10–586 kPa [1.5–85 psi] 4–20 mA
EN40-1A 912035 10–393 kPa [1.5–57 psi] 4–20 mA
EN40
Description Product Number
3 Micron and .1 Micron combination filter 912142
FILTER

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FORM NO. L-20097-F-0605
WARRANTIES
Nexen warrants that the Products will be free from any defects in material or workmanship for a period of 12 months
from the date of shipment. NEXEN MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL IMPLIED
WARRANTIES, INCLUDING WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. This warranty applies only if (a) the
Product has been installed, used and maintained in accordance with any applicable Nexen installation or maintenance
manual for the Product; (b) the alleged defect is not attributable to normal wear and tear; (c) the Product has not
been altered, misused or used for purposes other than those for which it was intended; and (d) Buyer has given
written notice of the alleged defect to Nexen, and delivered the allegedly defective Product to Nexen, within one
year of the date of shipment.
EXCLUSIVE REMEDY
The exclusive remedy of the Buyer for any breach of the warranties set out above will be, at the sole discretion of
Nexen, a repair or replacement with new, serviceably used or reconditioned Product, or issuance of credit in the
amount of the purchase price paid to Nexen by the Buyer for the Products.
LIMITATION OF NEXEN’S LIABILITY
TO THE EXTENT PERMITTED BY LAW NEXEN SHALL HAVE NO LIABILITY TO BUYER OR ANY OTHER PERSON
FOR INCIDENTAL DAMAGES, SPECIAL DAMAGES, CONSEQUENTIAL DAMAGES OR OTHER DAMAGES OF
ANY KIND OR NATURE WHATSOEVER, WHETHER ARISING OUT OF BREACH OF WARRANTY OR OTHER
BREACH OF CONTRACT, NEGLIGENCE OR OTHER TORT, OR OTHERWISE, EVEN IF NEXEN SHALL HAVE
BEEN ADVISED OF THE POSSIBILITY OR LIKELIHOOD OF SUCH POTENTIAL LOSS OR DAMAGE. For all of
the purposes hereof, the term “consequential damages” shall include lost profits, penalties, delay images, liquidated
damages or other damages and liabilities which Buyer shall be obligated to pay or which Buyer may incur based
upon, related to or arising out of its contracts with its customers or other third parties. In no event shall Nexen
be liable for any amount of damages in excess of amounts paid by Buyer for Products or services as to which a
breach of contract has been determined to exist. The parties expressly agree that the price for the Products and the
services was determined in consideration of the limitation on damages set forth herein and such limitation has been
specifically bargained for and constitutes an agreed allocation of risk which shall survive the determination of any
court of competent jurisdiction that any remedy herein fails of its essential purpose.
LIMITATION OF DAMAGES
In no event shall Nexen be liable for any consequential, indirect, incidental, or special damages of any nature
whatsoever, including without limitation, lost profits arising from the sale or use of the Products.
WARRANTY CLAIM PROCEDURES
To make a claim under this warranty, the claimant must give written notice of the alleged defect to whom the Product
was purchased from and deliver the Product to same within one year of the date on which the alleged defect first
became apparent.
WARRANTY
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, MN 55127
800.843.7445
Fax: [phone]
www.nexengroup.com