Woodward CPC-DX User manual

Product Manual 26758
(Revision B, 3/2017)
Original Instructions
CPC-DX
Current to Pressure Converter
Dual Transfer Skid
(For hydraulic pressure systems)
CPC-DX SKID 10 BAR PN: 8918-116
CPC-DX SKID 25 BAR PN: 8918-118
Installation and Operation Manual
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General
Precautions
Read this entire manual and all other publications pertaining to the work to be
performed before installing, operating, or servicing this equipment.
Practice all plant and safety instructions and precautions.
Failure to follow instructions can cause personal injury and/or property damage.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual
26455 , Customer
Publication Cross Reference and Revision Status & Distribution Restrictions, on
the publications page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
Proper Use
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or
property damage, including damage to the equipment. Any such unauthorized
modifications: (i) constitute "misuse" and/or "negligence" within the meaning of
the product warranty thereby excluding warranty coverage for any resulting
damage, and (ii) invalidate product certifications or listings.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual
26455 , Customer Publication
Cross Reference and Revision Status & Distribution Restrictions, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions— A bold, black line alongside the text identifies changes in this publication since the
last revision.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken.
Manual 26758
Copyright © Woodward, Inc. 2017
All Rights Reserved
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Contents
WARNINGS AND NOTICES ...............................................................................................................3
ELECTROSTATIC DISCHARGE AWARENESS......................................................................................4
REGULATORY COMPLIANCE............................................................................................................5
CHAPTER 1. GENERAL INFORMATION..............................................................................................7
Introduction ................................................................................................................................................... 7
System Description ....................................................................................................................................... 7
Design Characteristics .................................................................................................................................. 9
Construction .................................................................................................................................................. 9
CHAPTER 2. SYSTEM SPECIFICATIONS ..........................................................................................16
CHAPTER 3. INSTALLATION...........................................................................................................19
Receiving Instructions ................................................................................................................................. 19
Mounting Instructions .................................................................................................................................. 20
Hydraulic Connections ................................................................................................................................ 21
Electrical Connections................................................................................................................................. 21
Input Power ................................................................................................................................................. 21
Shielded Wiring ........................................................................................................................................... 25
Wiring .......................................................................................................................................................... 25
CPC-DX Calibration .................................................................................................................................... 25
CHAPTER 4. OPERATION...............................................................................................................26
CPC-DX performance ................................................................................................................................. 32
Online Change-Out of a Pressure Gauge................................................................................................... 40
CHAPTER 5. REPAIR AND TROUBLESHOOTING...............................................................................42
General........................................................................................................................................................ 42
Troubleshooting .......................................................................................................................................... 43
CHAPTER 6. PRODUCT SUPPORT AND SERVICE OPTIONS ..............................................................46
Product Support Options............................................................................................................................. 46
Product Service Options ............................................................................................................................. 46
Returning Equipment for Repair ................................................................................................................. 47
Replacement Parts...................................................................................................................................... 48
Engineering Services .................................................................................................................................. 48
Contacting Woodward’s Support Organization ........................................................................................... 48
Technical Assistance .................................................................................................................................. 49
CHAPTER 7. ASSET MANAGEMENT AND REFURBISHMENT SCHEDULING PERIOD ............................50
CHAPTER 8. LONG-TERM STORAGE REQUIREMENTS.....................................................................51
REVISION HISTORY.......................................................................................................................52
DECLARATIONS ............................................................................................................................53
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Illustrations and Tables
Figure 1-1. Basic CPC-DX Application and Configuration............................................................................ 8
Figure 1-2. CPC-DX Main Components........................................................................................................ 9
Figure 1-3. CPC-DX Installation Drawing Front view.................................................................................. 10
Figure 1-4. CPC-DX Installation Drawing, Top view................................................................................... 11
Figure 1-5. CPC-DX customer interface ..................................................................................................... 12
Figure 1-6. CPC-DX Main Terminal Box, Wiring Diagram.......................................................................... 13
Figure 1-7. CPC-DX Main Terminal Block Connections List ...................................................................... 14
Figure 1-8. Internal CPC wiring diagram..................................................................................................... 15
Figure 2-1. Internal Leakage, CPC-DX Skid, 10 bar supply pressure, oil viscosity 20 cSt; ....................... 18
Figure 2-2. Internal Leakage, CPC-DX Skid, 25 bar supply pressure, oil viscosity 20 cSt; ....................... 18
Figure 3-1. CPC-DX Lifting eyebolt location. .............................................................................................. 20
Figure 3-2. Power Supply Input Connections ............................................................................................. 22
Figure 3-3. Wiring Connections for Master Designation ............................................................................. 23
Figure 3-4. PE ground connection localization and details......................................................................... 24
Figure 4-1. Isolation Valve OPEN / CLOSED Lever Position ..................................................................... 27
Figure 4-2. CPC-DX Unit with All Isolation Valves in CLOSED Position.................................................... 28
Figure 4-3. CPC-DX Unit CPC-II Unit #1 with Supply and Control Isolation Valves in Open Position....... 29
Figure 4-4. CPC-DX Unit With All Isolation Valves in OPEN Position........................................................ 30
Figure 4-5. CPC-DX Skid with CPC-II Unit #1 Control Isolation Valve in CLOSED Position ..................... 30
Figure 4-6. CPC-DX Status Link Disconnection Inside Main Terminal Box ............................................... 31
Figure 4-7. CPC-DX Unit to Unit Control Switchover – Switchover Action Typical Performance............... 32
Figure 4-8. CPC-DX Unit Control Takeover (Second Unit Shutdown Simulation)...................................... 33
Figure 4-9. CPC-DX Skid Pressure between CPC-II Units (Pressure Offset) at 20 cSt Oil Viscosity ........ 34
Figure 4-10. Tuning Runs Showing the Effect of Adjusted Primary Gain Example Parameter Values...... 35
Figure 4-11. Tuning Runs Showing the Effect of Adjusted Proportional Trim Example Parameter Values36
Figure 4-13. 38
Figure 4-14. Low LLC Parameter – Sluggish Response, Visible Controlled Unit Position Variation, and
Unit-To-Unit Performance Difference..................................................................................... 39
Figure 4-15. Low LLC Parameter – Slightly Sluggish Response, Still Visible Controlled Unit Position
Variation, and Unit To Unit Performance Difference.............................................................. 39
Figure 4-16. High LLC Parameter – Visible Controlled Unit Position Overshoot, Acceptable Unit-To-Unit
Performance Difference ......................................................................................................... 40
Figure 4-17. Pressure Gauge Untightening from Manifold ......................................................................... 40
Figure 4-18. Pressure Gauge Untightening From Adapter ......................................................................... 41
Table 1-1. Terms and Definitions.................................................................................................................. 7
Table 1-2. Woodward Reference Literature.................................................................................................. 7
Table 2-1. Environmental ............................................................................................................................ 16
Table 2-2. Physical...................................................................................................................................... 16
Table 2-3. Electrical .................................................................................................................................... 16
Table 2-4. Hydraulic .................................................................................................................................... 16
Table 2-5. CPC-DX Maximum Input/Supply Pressure................................................................................ 17
Table 2-6. Hydraulic parameters................................................................................................................. 17
Table 3-1. Fuse/Breaker Requirements...................................................................................................... 22
Table 5-1. List of available Replacement Kits............................................................................................. 42
Table 5-2. Troubleshooting ......................................................................................................................... 43
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Warnings and Notices
Important Definitions
This is the safety alert symbol used to alert you to potential personal injury hazards. Obey all
safety messages that follow this symbol to avoid possible injury or death.
DANGER - Indicates a hazardous situation, which if not avoided, will result in death or serious injury.
WARNING - Indicates a hazardous situation, which if not avoided, could result in death or serious
injury.
CAUTION - Indicates a hazardous situation, which if not avoided, could result in minor or moderate
injury.
NOTICE - Indicates a hazard that could result in property damage only (including damage to the
control).
IMPORTANT - Designates an operating tip or maintenance suggestion.
Overspeed /
Overtemperature /
Overpressure
The engine, turbine, or other type of prime mover should be
equipped with an overspeed shutdown device to protect against
runaway or damage to the prime mover with possible personal injury,
loss of life, or property damage.
The overspeed shutdown device must be totally independent of the
prime mover control system. An overtemperature or overpressure
shutdown device may also be needed for safety, as appropriate.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage.
Always wear the appropriate personal protective equipment (PPE) for
the job at hand. Equipment that should be considered includes but is
not limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Overspeed /
Overpressure
Never close the drain line when supply pressure is present on the
CPC unit, otherwise the control output pressure can increase
suddenly and cannot be controlled by the input setpoint. This could
cause the turbine to overspeed. The supply pressure isolation valve
and the control pressure isolation valve should always be closed
prior to closing the drain line.
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Never disconnect the redundancy linkage between CPCs when
BOTH units are powered.
Only trained personnel are allowed to work on this device during
operation.
Battery Charging
Device
To prevent damage to a control system that uses an alternator or
battery-charging device, make sure the charging device is turned off
before disconnecting the battery from the system.
If necessary to comply with site safety procedures secure the control
and supply isolation valves with a padlock and tag to lock out the
CPC-DX system.
Electrostatic Discharge Awareness
Electrostatic
Precautions
Electronic controls contain static-sensitive parts. Observe the
following precautions to prevent damage to these parts:
Discharge body static before handling the control (with power to
the control turned off, contact a grounded surface and maintain
contact while handling the control).
Avoid all plastic, vinyl, and Styrofoam (except antistatic
versions) around printed circuit boards.
Do not touch the components or conductors on a printed circuit
board with your hands or with conductive devices.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715 , Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.
Follow these precautions when working with or near the control.
1. Avoid the build-up of static electricity on your body by not wearing clothing made of synthetic
materials. Wear cotton or cotton-blend materials as much as possible because these do not store
static electric charges as much as synthetics.
2. Do not remove the printed circuit board (PCB) from the control cabinet unless absolutely necessary.
If you must remove the PCB from the control cabinet, follow these precautions:
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, the connectors, or the components with conductive
devices or with your hands.
When replacing a PCB, keep the new PCB in the plastic antistatic protective bag it comes in
until you are ready to install it. Immediately after removing the old PCB from the control cabinet,
place it in the antistatic protective bag.
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Regulatory Compliance
European Compliance for CE Marking:
EMC Directive Declared to Directive 2014/30/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization of the laws of the
Member States relating to electromagnetic compatibility (EMC)
ATEX – Potentially
Explosive
Atmospheres
Directive:
Directive 2014/34/EU on the harmonisation of the laws of the Member States
relating to equipment and protective systems intended for use in potentially
explosive atmospheres
Zone 2, Category 3, Group II G, Ex nA IIC T4 Gc IP66
Other European and International Compliance:
Machinery Directive: Compliant as partly completed machinery with Directive 2006/42/EC of the
European Parliament and the Council of 17 May 2006 on machinery.
Pressure Equipment
Directive: Compliant as “SEP” per Article 4.3 to Pressure Equipment Directive
2014/68/EU on the harmonisation of the laws of the Member States relating
to the making available on the market of pressure equipment.
IECEx: Certified for use in hazardous locations: IECEx CSA 11.0017X (Ex nA) for
Zone 2, Category 3, Group II G, Ex nA IIC T4 Gc IP66 or Zone 2, Category 3
G, Ex nA IIC T4 Gc IP66
North American Compliance:
CSA: CSA Certified for Class I, Division 2, Groups A, B, C, & D, T4 at 85 °C
Ambient. For use in Canada and the United States.
Special Conditions for Safe Use
Wiring must be in accordance with North American Class I, Division 1 or 2, or European Zone 1,
Category 2 or Zone 2, Category 3 wiring methods as applicable, and in accordance with the authority
having jurisdiction.
Field wiring must be suitable for at least 85 °C and 10 °C above the maximum fluid and ambient
temperatures.
The CPC-DX must be used in an ambient temperature range from –40 to +85°C (-40 to + 185⁰F).
The working fluid temperature must be in range +15 to +70°C (+59 to 158⁰F).
Connect external safety ground terminal to earth ground.
Compliance with the Machinery Directive 2006/42/EC noise measurement and mitigation requirements
is the responsibility of the manufacturer of the machinery into which this product is incorporated.
The external ground lugs shown on the installation drawing must be properly connected to ensure
equipotential bonding. This will reduce the risk of electrostatic discharge in an explosive atmosphere.
AND
Any cleaning by hand or with water spray must be performed while the area is known to be non-
hazardous to prevent an electrostatic discharge in an explosive atmosphere.
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Explosion Hazard—Do not connect or disconnect while the circuit is
live unless the area is known to be non-hazardous.
Substitution of components may impair suitability for Class I, Division
1 or 2 or Zone 2 applications.
Risque d’explosion—Ne pas raccorder ni débrancher tant
que l’installation est sous tension, sauf en cas l’ambiance
est décidément non dangereuse.
La substitution de composants peut rendre ce matériel
inacceptable pour les emplacements de Classe I,
applications Division 1 ou 2 ou Zone 2.
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Chapter 1.
General Information
Introduction
Table 1-1. Terms and Definitions
CPC-DX Current to Pressure Converter Dual Transfer Skid
CPC-II Current to Pressure Converter
DCS Distributed Control System
In Control The unit actually controlling the position of the servo system
LLC Load Leakage Compensation
Master / Slave The unit designated as the Master has yielded control to the other unit (Slave) by link
between the two CPC-IIs. The Unit designated, as the Master will take control during
CPC-DX startup.
Not In Control The unit acting as the backup to the In Control unit
SW wrench size [mm]
To aid with calibration, pressure gages are provided on the skid assembly (see Figure 1-2). These gages
indicate which unit is in control. The unit in control will show an operating value (typically 0.8 bar) higher
than the slave unit during normal operation.
Table 1-2. Woodward Reference Literature
Product Manual 26615 CPC-II Current-to-Pressure Converter with Enhanced
Dynamics
CPC-II Unit replacement Procedure 26824 CPC-DX Current to Pressure Converter Dual Transfer
Skid, CPC-II Unit replacement procedure
Manual 25071 Oils for Hydraulic Controls
Reference Manual26455 Woodward Energy Segment Customer Publications:
Cross-Reference by Application Revision Status &
Distribution Restrictions
Manual 82715 Guide for Handling and Protection of Electronic
Controls, Printed Circuit Boards, & Modules
Manual 25075 Commercial Preservation Packaging for Storage of
Mechanical-Hydraulic Controls
System Description
The Woodward CPC-DX Dual Transfer Skid is a dual redundant, Current-to-Pressure Converter system.
Its typical application is to control steam valves by interfacing redundant turbine controllers or signals to a
single steam control valve servo mechanism.
The system offers redundant operation of a steam valve servo assembly in applications where it is not
desirable for failure of the turbine control system and/or pressure converter to interrupt the operation of
the turbine.
CPC-DX Dual Transfer Skid can be used also in other applications.
Contact with Woodward for more information and guidance for use in
different systems other than that described within this document.
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The “Master/Slave” indication shows only which unit is designated for
primary operation from the control system. Because it is possible for
the slave to be in control, it is necessary to confirm which unit is
controlling the skid output via the external gages and the “In Control”
discrete output status.
For a full description of the CPC-II, see Woodward manual 26615 .
For the online CPC-II replacement procedure, see Woodward manual
26824
The CPC-DX Dual Transfer Skid supplies a precise and stable hydraulic control pressure proportional to
the (4 to 20) mA input current signal. The system described in this manual consists of a skid-mounted
arrangement of two CPC-II’s operating through a transfer valve assembly as shown in Figure 1-1.
Figure 1-1. Basic CPC-DX Application and Configuration
The electronics and software design of the CPC-II provides continuous communication between two
CPCs to communicate their health and control status between units. Should there be a failure of the In
Control converter or loss of signal its turbine control, the Not In Control unit will detect the fault condition
automatically and assume control of the skid output pressure. This occurs without required intervention by
the turbine control system.
The two outputs from the turbine control system(s) provide the setpoint inputs to the two CPC-II
converters 1 and 2.
The user can also switch between converters at any time to verify unit operation or to distribute run time
among the two converters.
Additionally the system allows for the field replacement of CPC-II unit in the event of a failure, without the
need to stop the turbine or control system.
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While running, the Not in Control unit continuously biases its pressure output to track at a fixed level
below the In Control unit. This fixed pressure differential applied across the internal high signal select
valve holds the switching valve in the position allowing the In Control unit full authority to raise and lower
the control pressure based on its setpoint. If the In Control unit or its controller fails, the failsafe
configuration causes the converter output pressure to fall, allowing the high signal select valve to shift to
the operational unit. When this occurs, the Not In Control unit eliminates its pressure bias, which switches
the high signal select valve to the opposite position quickly. Since the transitioning converter only needs
to change pressure by the bias amount, this tends to maintain the skid output pressure, with minimum
transient impact to the operated steam valve position. An additional benefit of the continuous tracking
feature of the Not In Control unit is continuous demonstration of its availability to assume control when
needed.
The CPC-DX uses a specially designed fast-switching high signal select valve to ensure minimal control
switchover time and minimal system control pressure disturbance.
Design Characteristics
The skid assembly has been designed to offer maximum reliability, especially for critical steam turbine
applications, and features include:
Ease of installation
Minimum hydraulic connections, reducing the potential for oil leakage
Compact design
Rapid control switchover (transfer) time
4 (four) Isolation valves which allow each CPC-II to be fully calibrated and checked before switching it
to on-line service
Dirt tolerant shuttle valve
Online diagnostics and automatic switchover logic
On-line replacement capability to safely and reliably disable, remove or replace the one of the CPC-II
without the need to stop the turbine or control system.
Construction
The CPC-DX is a complete packaged and tested assembly which consists of two Woodward current-to-
pressure converters (CPC-II’s) connected together to a single manifold with all interconnect piping,
gauges and wiring included and factory tested.
The two CPC-II’s are mounted to an anodized aluminum manifold containing the transfer valve, isolation
valves and pressure test points. The manifold and CPC-II’s are mounted to a steel support frame.
ELECTRICAL
TERMINAL
BOX
CPC-II UNIT #2
SUPPORT FRAME
CONTROL ISOLATION VALVE
FOR CPC-II UNIT#2
SUPPLY ISOLATION VALVE
FOR CPC-II UNIT #2
PRESSURE GAUGE FOR CPC-II
UNIT#2
CPC-II UNIT #1
CONTROL PRESSURE
GAUGE
SUPPLY ISOLATION VALVE
FOR CPC-II UNIT #1
CONTROL ISOLATION
VALVE
FOR CPC-II UNIT #1
PRESSURE GAUGE FOR
CPC-II UNIT #1
Figure 1-2. CPC-DX Main Components.
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The complete assembly is designed for use in a hazardous environment, see the Regulatory Compliance
specifications for more details.
Integrated oil pressure gauges allow the user to visually verify which CPC-II is in control and verify the
CPC-DX output oil header pressure level. The CPC II discrete output status contacts can also be used to
provide verification of operation or shutdown via status lamps and/or the plant DCS to assist with system
health monitoring.
The CPC-DX ports are represented as SUPPLY for the supply oil port, DRAIN CPC 1 and DRAIN CPC 2
for the drain (tank) lines, and CONTROL for the CPC-DX control oil connection to the control system as
shown in Figure 1-5.
Figure 1-3. CPC-DX Installation Drawing Front view
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Figure 1-4. CPC-DX Installation Drawing, Top view
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Figure 1-5. CPC-DX customer interface
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The wiring for the CPC-DX skid is shown in Figures 1-6 and 1-7. The required minimum wiring for proper
operation is as follows:
Supply Power (18 to 32) V (dc), 24 V (dc) nominal for each converter
Analog Setpoint1 (4 to 20) mA into 200 . 70 dB CMRR. Common
Mode Voltage Range: ±100 V for each converter
Master Designation Discrete Input + & - for each converter (described in chapter 3)
Redundant Link Input and Output for each unit (factory provided)
The remaining signals shown on the wiring diagram are optional.
1. It is important that during operation, the setpoint signals to both converters are nearly identical.
WIRES FROM CPCs
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 15 20 20
16 17 18 19 21 22 23 24 25 26 27 28 29 30 31 32 33 34
4 5 6 7 8 9 10 11 12 13 14 21 22 23 24 25 26 27 28 29 30 31 32 33 34
1 2 3
SIGNALS FROM CPC-II
UNIT #1
SIGNALS FROM CPC-II
UNIT #2
CUSTOMER SIGNALS TO
CPC-II UNIT #2
CUSTOMER SIGNALS
TO CPC-II UNIT #1
15 20
16 17 18 19
TERMINAL #
Figure 1-6. CPC-DX Main Terminal Box, Wiring Diagram
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Figure 1-7. CPC-DX Main Terminal Block Connections List
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WIRES TO J-BOX
WIRES TO J-BOX
4 5 6
7 8 9 10 18 20
11 12 13 15 14 16 2 3
31 30 29
28 27 26 25 17 15
24 23 22 20 21 19 33 32
34
1
CPC-II Unit #2
TERMINALS CPC-II Unit #1
TERMINALS
Figure 1-8. Internal CPC wiring diagram
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Chapter 2.
System Specifications
Table 2-1. Environmental
Ambient Temperature –40 to +85°C (-40 to + 185⁰F)
Humidity 95 % relative humidity
Oil Temperature +15 to +70°C (+59 to 158⁰F)
Oil Viscosity 10 to 55 centistokes
Max. Surface Temperature 85 °C
Vibration US MIL-STD 810F, M514.5A, Cat. 4 (0.015 G²/Hz, 10 to 500 Hz, 1.04
Grms)
Shock US MIL-STD-810C method 516.2, procedure 1 (10 G Peak, 11 ms
duration, saw tooth)
Ingress Protection IP66 per IEC EN 60529 with IECEx conditioning as described by IEC
60079-0:2011 and IEC 60079-15:2010
Table 2-2. Physical
Height x Width x Depth Approx. (696 x 619.3 x 385.1) mm /(27.40 x 24.38 x 15.16) inch
Weight Approx. 81.6 kg (180 lbs) without oil
Mounting 6x8 holes Ø.609-.625 (15.47-15.87 mm) (for M14 screws), see Figure 1-3.
Table 2-3. Electrical
Connections Junction box terminals suitable for (0.8 to 3) mm² / (12 to 18) AWG
stranded wire
Cable Entries Entry power supply wires via 2 x 1/2 NPT CONDUIT HUB and signal
wires via 2 x 3/4 NPT CONDUIT HUB
Supply Voltage (18 to 32) V (dc), 24 V (dc) nominal (use cable 3 mm² / 12 AWG)
Power Consumption 25 W steady state Transient 90 W (2 s maximum)
Setpoint Signal (4 to 20) mA into 200 . 70 dB CMRR. Common Mode Voltage
Range: 100 V
Redundant Input or
Feedback Signal (4 to 20) mA into 200 . 70 dB CMRR. Common
Mode Voltage Range: 100 V
Analog Output Signal (4 to 20) mA. Maximum external load: 500 Accuracy ±0.5 % of full
scale
Discrete Output Signal Configurable for NO or NC,
0.5 A at 24 V (dc), max. 32 V (dc)
0.5 A inductive at 28 V (dc) 0.2 Henry
Note: For more electrical information, see CPC-II manual 26615.
Table 2-4. Hydraulic
HYDRAULIC SUPPLY connection 1.062-12 UN straight thread port
HYDRAULIC CONTROL connection 1.062-12 UN straight thread port
HYDRAULIC DRAIN CPC-II Unit #1 connection 1.312-12 UN straight thread port
HYDRAULIC DRAIN CPC-II Unit #2 connection 1.312-12 UN straight thread port
Note: For more details, see Figure 1-5.
Note: Hydraulic ports per Woodward Inc. SS-145 (MS 16142 except minor diameter to accept “J”
threads)
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Table 2-5. CPC-DX Maximum Input/Supply Pressure
CPC-DX Models Maximum Input/Supply Pressure
SKID 10 BAR 10 bar / 145 psi
SKID 25 BAR
25 bar / 363 psi
Hydraulic supply pressure stability must be within ±5 % of the
minimum control pressure.
Tank Pressure 2 bar maximum or 30 % of the minimum control pressure whichever is
lower
Recommended Fluid Mineral or synthetic based oils may be used. Woodward oil
recommendations per manual 25071.
Oil Cleanliness ISO 4406:99 code 22/20/16 max fluid cleanliness or better is
recommended for optimum reliability, code 19/17/14 preferred
Table 2-6. Hydraulic parameters
NAME CPC-DX SKID
10 BAR Model CPC-DX SKID 25 BAR Model
Maximum Input / Supply Pressure 10 bar / 145 psi 25 bar / 363 psi
Minimum Output / Control Pressure at setpoint 4 mA
(1)
1.5 bar ( 22 psi) 1.5 bar ( 22 psi)
Maximum regulating Output/Control Pressure at
setpoint 20 mA
(2)
7 bar ( 101 psi) 17.5 bar (254 psi)
Max Output / Control flow
(3)
23 l/min (6 US gpm) 23 l/min (6 US gpm)
Max Internal leakage
(4)
31 l/min (8.2 US gpm) 49 l/min (13 US gpm)
(2)
The maximum control pressure setting must be less than 70% of the
supply pressure for optimum dynamic performance.
(3)
The default offset value of 0.8 bar is sufficient to ensure CPC-DX
operation with flow to the control line up to 23 l/min (6 US gpm) at
oil viscosity up to to 55 cSt. If the application requires higher flow
rates to the control line or higher oil viscosity usage, the offset
pressure between units will need to be increased.
(4)
The maximum internal leakage determined with Max control
pressure and oil viscosity 20 cSt.
Internal leakage and control pressure correlation – see Figure 2-1 and 2-2 below.
Released

Manual 26758 CPC-DX Current to Pressure Converter
Woodward 18
Figure 2-1. Internal Leakage, CPC-DX Skid, 10 bar supply pressure, oil viscosity 20 cSt;
Figure 2-2. Internal Leakage, CPC-DX Skid, 25 bar supply pressure, oil viscosity 20 cSt;
Released