85202C

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A PPLICATION

The Woodward Current to PressureConverter (CPC) is designed forpositioning steam and fuel valves

and/or the associated servos. A 4-20mA in/out signal is linearly andproportionally converted into ahydraulic output pressure. The CPCcan thus interface with anyelectronic control, such asWoodward NetCon® systems andthe Woodward 505 Control. Itconnects to pressure-operated servosystems and single-acting powercylinders. The CPC is suited fornew as well as retrofit applications.

DESCRIPTION

The CPC is an electrohydraulic pressureregulating valve, which consists of a valve, anactuator, a pressure sensor, and on-boardelectronics.

The electronics perform the signalconditioning by comparing the actual outputpressure with the command, which results in areference signal for the valve position. Thisreference signal is then compared with theactual position, resulting in a drive signal. Thedriver circuit then outputs the appropriatesignal to the actuator, which positions thehydraulic valve to the required position. Thevalve consists of two ports; one from supply tooutput, and one from output to tank. Byopening one of these ports, the outputpressure decreases or increases.

Two output signals are provided: a 4-20 mAsignal, representing the actual output pressure,and a relay output, indicating a malfunction of the CPC.

FEATURES

The anodized aluminum housing of the CPC,coupled with the cast, anodized aluminum topcover forms an EEx-d explosion-proof enclosure. This enclosure contains the printedcircuit board, the pressure sensor, and theactuator. The rotor of the actuator is directlycoupled to the one-stage hydraulic valve.

The construction of the hydraulic valve in theCPC tolerates contaminant particles up to40 µm.

Upon loss of power a return spring will forcethe output pressure to the drain pressure (failsafe).

The supply connection of the CPC is providedwith a 70 µm nominal, 105 µm absolute last-chance filter.

A brass cable gland is provided for access of thecable with electrical signals.

The CPC mounts to a manifold with astandard instrument mounting hole patternaccording to DIN 19213.

� Precise Fluid Pres

Control

� Linear Operation

� Adjustable Outpu

Pressure Range

� Two Output Signa

� Contaminant

Tolerant

� Explosion-proof

Enclosure

� Standard Instrum

Mounting

Product Specificatio

85202C

CPC

Current to Pressure Converter

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ACCESSORIES

A standard stainless steel adapter plate (P/N 4349-231) withor without close-off valves can be supplied with the CPC.

To replace the obsolete I/H converter, use the adapter plate3689-097.

Power supplies can be provided, suitable for either 110 Vacor 230 Vac.

FLOW CHARACTERISTIC

OUTPUT PRESSURE VS. COMMAND INPUT

SPECIFICATIONS

EL ECTRIC ALConnections..................................................................9 screw terminals on the internal printed circuit board suitable

for 0.2-4 mm2solid or 0.2-2.5 mm

2stranded wire (24-12 AWG).

1.5mm2(16 AWG) is recommended for the power lines, and

0.75mm2(18 AWG) for all other connections.

Cable Entr y ....................................................................Via cable gland�Cable diameter. 9-12 mm

Suppl y Voltage ..............................................................18-32 Vdc (24 Vdc nominal)Power Consumption......................................................8 W during steady state, 120 W peak (3 seconds maximum)

Current Input Signal ......................................................4-20 mA into 250 ohms

Analog Output Signal....................................................4-20 mA - Maximum external load: 300 ohms. Accuracy= ±1%

Discrete Output Signal ..................................................relay - jumper selectable for NO or NC. Maximum rating 1 A at30 Vdc

Dither Frequency ..........................................................10-30 Hz�Default setting is 30 Hz

Dither Amplitude ..........................................................zero is minimum and default. Maximum depends on adjustedfrequency and dynamic characteristics of the entire system.

HY DRAULICConnections..................................................................flat mounting face, hole pattern according to DIN 19213.

Hydraulic connections via an adapter plate (optional).

Suppl y Pressure..............................................................17 bar (250 psi) maximum. At least 0.5 bar higher than themaximum output pressure.

Output Pressure ............................................................minimum level: 1 bar (14.5 psi)maximum level: 15 bar (217.5 psi)

......................................................................................minimum range: 1 bar (14.5 psi)Maximum range: 14 bar (203 psi)

Standard Pressure Range..............................................4-20 mA gives 1.5 to 4.5 bar (21.75 to 65.25 psi)

Recommended Filter Rating ........................................nominal 40 µm and 75 µm absolute (B40,=75)

V iscosit y ........................................................................20 to 100 cSt

Leakage ........................................................................depends on viscosity and supply pressure � see figure

Flow Capacit y ..............................................................depends on viscosity and pressure difference � see figure

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TYPICAL SYSTEM USING THE CPC

PERFORMANCEFrequency response ....................................................10-30 ms time constant, small step, blocked load (no servo

system attached to the CPC). Ultimate dynamic responsedepends on total servo system and dynamic adjustments tothe CPC.

Linearit y ..........................................................................0.2% of full range

Repeatabilit y ................................................................0.1% of full range

Temperature Drift ..........................................................0.01% full range / °C

ENV IRONMENTAL A mbient Temperature ..................................................-20 to +85 °C�For explosion-proof units, refer to the certificate

Oil Temperature ............................................................60 °C maximum, 80 °C peak

Max imum Surface Temperature ..................................85 °C, provided above temperature requirements are fulfilled

Vibration ........................................................................Lloyd�s LR type approval test specification 1, test 25-100 Hz at 4.0 g

EMC ..............................................................................EN 50 081-2 and EN 50 082-2. Compliance with CE-mark immunity and emissions requirements for heavy industry environments.

Ex plosion Safet y ............................................................EN 50 014 and EN 50 018 (CENELEC EEx-d, flameproof)

......................................................................................EEx d IIC T5,T6

......................................................................................KEMA 94.D.9629 X

Dust and Water Proof ....................................................1P65

PHY SIC ALDimensions....................................................................see outline drawing

Height x W idth x Depth ..................................................approximately 220 x 170 x 200 mm

Weight ..........................................................................approximately 10 kg without oil

Mounting ......................................................................four M10 threaded holes, 23 mm deep, on the face with thehydraulic ports, according to DIN 19213

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99/2/F

3800 N. Wilson Ave.P.O. Box 3800Loveland, CO, U.S.A.80539-3800Ph: 1 970-663-3900Ph: 1 800-835-5182Fax: 1 970-962-7050

www.woodward.com

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Distributors & Ser vice Woodward has a network ofdistributors and service facilities. For

your nearest representative call1 800-835-5182 or see the

Worldwide Directory on our web site.

CORPORATE HEADQUARTERS/

AIRCRAFT CONTROLS

Rockford, IL, U.S.A.

1 815-877-7441

This document is distributed

for informational purposes only.

It is not to be construed as

creating or becoming part of

any Woodward Governor

Company contractual or warranty obligation unless

expressly stated in a written

sales contract.

NetCon is a registered

trademark of Woodward

Governor Company.

© Wood w ard Governor

Company, 1996 All Rights Reser ved

For more information contact:

OUTLINE DRAWING

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85202C