Nexen EN40-IS User manual
(i)
Electro-Pneumatic Converter
Model EN40-IS
FORM NO. L-20113-E-0501
WEB CONTROL PRODUCTS
User Manual
(ii)
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
(651)484-5900
www.nexengroup.com
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
Copyright 2000 Nexen Group, Inc.
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.
WARNING
(iii)
TABLE OF CONTENTS
Introduction---------------------------------------------------------------------------------------------------------------------------------------- 1
Theory of Operation--------------------------------------------------------------------------------------------------------------------------- 2
Installation ---------------------------------------------------------------------------------------------------------------------------------------- 2
Electrical Connections------------------------------------------------------------------------------------------------------------------------ 4
Air Line Connections -------------------------------------------------------------------------------------------------------------------------- 5
Adjustment ---------------------------------------------------------------------------------------------------------------------------------------- 6
Maintenance ------------------------------------------------------------------------------------------------------------------------------------- 7
Troubleshooting---------------------------------------------------------------------------------------------------------------------------------- 7
Parts List ------------------------------------------------------------------------------------------------------------------------------------------- 8
Field Wiring Intrinsic Safety----------------------------------------------------------------------------------------------------------------- 8
Warranties --------------------------------------------------------------------------------------------------------------------------------------- 10
1FORM NO. L-20113-E-0501
INTRODUCTION
Read this manual carefully, making full use of its explanations and instructions. The “Know How” of safe, continuous,
trouble-free operation depends on the degree of your understanding of the system and your willingness to keep all
components in proper operating condition. Pay particular attention to all NOTES, CAUTIONS, and WARNINGS to avoid
the risk of personal injury or property damage. It is important to understand that these NOTES, CAUTIONS, and
WARNINGS are not exhaustive. Nexen cannot possibly know or evaluate all conceivable methods in which service may
be performed, or the possible hazardous consequences of each method. Accordingly, anyone who uses a procedure
that is not recommended by Nexen must first satisfy themselves that neither their safety or the safety of the product will
be jeopardized by the service method selected.
2FORM NO. L-20113-E-0501
THEORY OF OPERATION
Nexen’s EN40-IS Electro-Pneumatic Converter converts
current input signals into corresponding pneumatic
signals. Normally the EN40-IS is used as part of a
Nexen-Nireco Intrinsically Safe Tension Control System,
or as an independent Electo-Pneumatic Converter,
controlled by an external signal from a Process Controller,
using an appropriate Zenier Barrier.
EN40-IS balances the force of a moving coil with the
force of a poppet valve, and amplifies the air flow and
pneumatic pressure passing through a fixed orifice by
means of the booster relay, resulting in a pneumatic
pressure proportional to the electric signal.
When current flows through the moving coil, a downward
force is induced proportionally to the current value. This
reduces the clearance between the poppet and seat,
causing back pressure to rise (See Figure 1).
Back pressure is too low to use as an output, but is used
as the pilot pressure for the Booster Section, increasing
both pressure and volume to provide a usable output. FIGURE 1
Spring
Plate
Fixed
Orifice
Moving
Coil
Permanent
Magnet
Poppet Seat
Pilot Pressure
Chamber
INSTALLATION
NOTE The EN40-IS must be mounted vertically within ±
15 degrees in a shock and vibration free area.
Locate the EN40-IS as close as possible to the
controlled element to guarantee quick precise
control (See Figure 2).
FIGURE 2
WALL MOUNTING
1. Drill two 0.28 In. [10 mm] diameter holes 4.57 In.
[166 mm] apart in the Mounting Panel. 2. Secure the EN40-IS to the Mounting Panel using the
cap screws provided in parts bag.
3FORM NO. L-20113-E-0501
BASE MOUNTING
1. Remove the EN40-IS wall mounting bracket from the
EN40-IS.
2. Secure the EN40-IS to the base using the Brackets
and M5 cap screws provided (See Figure 3).
FIGURE 3
MANIFOLD MOUNTING
1. Remove the EN40-IS wall mounting bracket from the
EN40-IS.
2. Plug the INLET and OUTLET ports with the provided
Plugs.
3. Remove the Plugs from the underside of the EN40-
IS and install the provided O-rings (See Figure 4).
4. Secure the EN40-IS to the Manifold using the
provided Brackets and M5 cap screws (See Figures
5 and 6).
Remove Plugs
and
install
O-rings
FIGURE 4
FIGURE 5
FIGURE 6
4FORM NO. L-20113-E-0501
ELECTRICAL CONNECTIONS
1. Remove the cover from the EN40-IS and remove the
WARNING Tag from the INPUT terminals (See
Figure 7).
CAUTION
Always short the INPUT terminals when
transporting or storing the EN40-IS.
2. Using customer supplied 18AWG wire, connect
EN40-IS to Zenier Barrier, routing wire through
threaded conduit hole on side of EN40-IS.
3. Connect the EN40-IS Ground to a suitable ground.
CAUTION
Always observe the polarity of the
EN40-IS terminals. The Driving Design
is the logic diagram used with the
TC240-IS System (See Figure 8). If the
TC240-IS is not used, refer to the
Sinking Design (See Figure 9).
Remove
WARNING
Tag
FIGURE 7
FIGURE 8
Driving Design
FIGURE 9
Sinking Design
5FORM NO. L-20113-E-0501
AIR LINE CONNECTION
Nexen’s EN40-IS requires clean, pressure regulated air
for maximum performance and long life. Your Nexen
Distributor carries filters and regulators specifically
designed to operate with Nexen products.
A Pre-filter (rated at 5.0 micron) removes large particles
from the air supply. The Coalescing Filter (0.04 micron or
less) is then used to filter the air before it enters the
EN40-IS (See Figures 10 and 11).
FIGURE 10
FIGURE 11
CAUTION
When lubrication is required for the final
control element, a pilot operated regula-
tor (or booster) must be used to segre-
gate the EN40-IS from the lubricated
air during exhaust or pressure reduction
phases (See Figure 11).
6FORM NO. L-20113-E-0501
ADJUSTMENT
Nexen’s EN40-IS has been factory adjusted and should
not require further adjustment.
The EN40-IS is available in three models. The model
designation can be found on the serial number tag,
located on the front of the EN40-IS. If adjustments are
required, determine the model and refer to Table 1 for the
correct values called out in the adjustment procedure.
TABLE 1
Rotate to adjust
output to Pmin
Gauge Port
Plug
FIGURE 12
SPAN ADJUSTMENT
NOTE: Supply pressure must be Psup.
1. Perform Zero Adjustment.
NOTE: Do not remove air pressure gauge.
2. Using the Manual Control Pot located on Controller,
adjust the Controller output to Imax.
3. Remove the top cover.
4. Using a screwdriver, adjust the Span Pot to obtain
Pmax output (See Figure 13).
FIGURE 13
Span Pot
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)CDAm(nimI 444
)CDAm(xamI020202
)isp(nimP5.15.13
)isp(xamP755851
)isp(pusP0700102
ZERO ADJUSTMENT
1. Remove the Gauge Port Plug and install a suitable air
pressure gauge.
2. Set Controller Mode Switch to Manual.
3. Using the Manual Control Pot located on Controller,
adjust the Controller output to Imin.
4. Remove the Zero Adj. Cover.
5. Using a screwdriver, adjust the EN40-IS 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.
6. Replace the Zero Adj. Cover.
7. Remove the air pressure gauge and reinstall the
Gauge Port Plug.
7FORM NO. L-20113-E-0501
PARTS LIST
FIELD WIRING INTRINSIC SAFETY
This barrier effectively isolates the Sensors and Electro-
Pneumatic Converter in the hazardous area from the
Controller in the nonhazardous area. These components
are used to build a tension control system for hazardous
areas, as certified by Factory Mutual (FM) to meet
NOITPIRCSED SA1-04NE SB1-04NE SD1-04NE
ylbmessAmgarhpaiDreppU027202720272
ylbmessAmgarhpaiDrewoL127222723272
etalPecifirO266226622662
teppoPhtiwylbmessAlioC666266626662
requirements for Intrinsically Safe Class I, II, and III,
Division 1, Groups A, B, C, D, E, F, and G, Nonincendive,
Class I, Division 2, Group A, B, C, and D. Suitable for
Class II, Division 2, Group G, when connected per
Horton Drawing SC-1395 (See Figure 16).
8FORM NO. L-20113-E-0501
MAINTENANCE
There is no scheduled maintenance required for Horton’s
EN40-ISElectro-PneumaticConverter.
TROUBLESHOOTING
OPERATIONAL CHECK
1. Remove the Gauge Port Plug and install a suitable air
pressure gauge.
2. Apply Psup to inlet port (See Table 1).
3. Vary the electrical signal to the EN40-IS within the
range of 4-20mADC.
CLEANING FIXED ORIFICE
NOTE: If dirt particles are present in the Fixed Orifice,
check the condition of Pre-filter and Coalescing
Filter. These filters must be kept clean and
properly maintained to prevent clogging of the
Fixed Orifice.
1. Remove the Fixed Orifice Housing (See Figure 14).
2. Remove the O-ring and Orifice Plate (See Figure 15).
3. Clean the Fixed Orifice Housing air passage.
4. Passing a thin wire through the hole in Orifice Plate,
clean the 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 the Orifice Plate and clean O-rings into the
Fixed Orifice Housing.
6. Install the Fixed Orifice Housing onto the EN40-IS.
a. If the pressure does not vary directly with
signal, reverse the electrical leads.
b. If the pressure is slow to react to changes in
signal, clean the Fixed Orifice.
FIGURE 14
Fixed
Orifice
Housing
FIGURE 15
O-ring
Orifice
Plate
9FORM NO. L-20113-E-0501
FIGURE 16
Field Wiring Intrinsic Safety (SC-1395)
10FORM NO. L-20113-E-0501
WARRANTIES
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
BEENADVISEDOFTHEPOSSIBILITY 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 whatso-
ever, 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.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, MN 55127
800.843.7445
Fax: 651.286.1099
www.nexengroup.com
ISO 9001 Certified
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