{"product_id":"woodward-8901-457-cpc-ii-digital-speed-controller-module","title":"Woodward 8901-457 CPC-II Digital Speed Controller Module","description":"\u003ch3\u003eWoodward 8901-457 CPC-II Digital Speed Controller Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 8901-457\u003c\/strong\u003e is a \u003cstrong\u003eCPC-II (Current-to-Pressure Converter II) digital speed controller module\u003c\/strong\u003e that serves dual critical functions in turbine and engine control systems: as a \u003cstrong\u003efrequency-to-voltage signal converter\u003c\/strong\u003e for speed sensing applications, and as an \u003cstrong\u003eelectro-hydraulic servo driver\u003c\/strong\u003e (PGPL457) for precise valve positioning. It converts magnetic pickup or tachometer signals into standardized control outputs while also driving dual-coil servo valves with high-precision current, making it a versatile core component in power generation, oil \u0026amp; gas, and marine propulsion systems.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8901-457\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Model:\u003c\/strong\u003e PGPL457\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e CPC-II Digital Speed Controller \/ Frequency-to-Voltage Converter \/ Electro-Hydraulic Servo Driver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e CPC-II \/ PGPL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Woodward, Inc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e--- Speed Control Function (CPC-II) ---\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Signal:\u003c\/strong\u003e AC voltage from magnetic pickup or tachometer, 0.5–20 V peak-to-peak; 60–12,000 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Frequency Range:\u003c\/strong\u003e 1 Hz to 10 kHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Signal:\u003c\/strong\u003e DC voltage proportional to input frequency (0–10 VDC typical); 4–20 mA, ±20 mA, PWM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Load Capacity:\u003c\/strong\u003e Minimum 1 kΩ, standard 10 kΩ recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.25% steady-state speed accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResponse Time:\u003c\/strong\u003e Adjustable 0.1–20 seconds; \u0026lt;10 ms for frequency conversion\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e--- Servo Driver Function (PGPL457) ---\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Signal:\u003c\/strong\u003e 4–20 mA or 0–10 V DC (selectable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e \u0026gt;100 kΩ (voltage); \u0026lt;500 Ω (current)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Current:\u003c\/strong\u003e ±40 mA maximum (adjustable), bidirectional constant current source\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Dual-coil servo valve drive (push-pull)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad Type:\u003c\/strong\u003e Dual-coil servo valves (Moog DDV, Woodward VP series)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e--- Electrical \/ Environmental ---\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 24 V DC nominal (+10%\/-15%); 10–35 V DC range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Consumption:\u003c\/strong\u003e \u0026lt;15 W (servo driver); ~5 W (converter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Input \/ Output \/ Power triple isolation (500 V AC from digital common and chassis)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e Gain and Zero potentiometers (field-adjustable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicators:\u003c\/strong\u003e POWER (green), FAULT (red), OUTPUT (yellow) LEDs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -40°C to +85°C (converter); -30°C to +70°C (servo driver)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e -50°C to +100°C (converter); -40°C to +85°C (servo driver)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelative Humidity:\u003c\/strong\u003e 0% to 95% non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 512 × 325 × 129 mm (controller enclosure); 120 × 80 × 40 mm (compact module)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.4 kg (converter module); 1.2 lbs (controller); 1.35 kg (some configurations)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Panel or chassis-mounted; DIN rail (TS-35) or panel mount (servo driver variant)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Rating:\u003c\/strong\u003e IP20 (servo driver); IP52 \/ NEMA 4X optional (controller)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e CE, UL Recognized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMTBF:\u003c\/strong\u003e \u0026gt;50,000 hours\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Function Versatility:\u003c\/strong\u003e Combines frequency-to-voltage conversion for speed sensing with electro-hydraulic servo driving for valve control—reducing component count and simplifying system architecture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Precision Speed Measurement:\u003c\/strong\u003e Converts magnetic pickup or tachometer signals into accurate DC voltage or current outputs with ±0.25% steady-state accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Current Output:\u003c\/strong\u003e ±40 mA bidirectional drive with low drift ensures accurate servo valve positioning for steam and fuel valve control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Coil Push-Pull Drive:\u003c\/strong\u003e Optimized for dual-coil servo valves, providing faster response and improved linearity compared to single-coil drivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField-Adjustable Calibration:\u003c\/strong\u003e Gain and Zero potentiometers allow on-site matching to specific sensor and servo valve characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple Isolation:\u003c\/strong\u003e Input, output, and power circuits are galvanically isolated (500 V AC), eliminating ground loop issues and protecting sensitive electronics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Protection:\u003c\/strong\u003e Output short-circuit, overcurrent, reverse polarity, and ESD protection safeguard the module and connected equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual Diagnostics:\u003c\/strong\u003e LED indicators provide instant status verification: POWER (green), FAULT (red), OUTPUT (yellow).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdaptive Tuning:\u003c\/strong\u003e Built-in algorithms dynamically compensate for load changes and transient conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-Redundant Processing:\u003c\/strong\u003e Optional TMR configuration for critical safety applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Module Hot Standby:\u003c\/strong\u003e Ensures uninterrupted operation during maintenance or fault conditions.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Generation:\u003c\/strong\u003e Industrial steam turbine, gas turbine, and hydro turbine speed\/load control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; Gas:\u003c\/strong\u003e Pipeline compressor speed regulation, offshore platform turbo-compressor control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine:\u003c\/strong\u003e Ship propulsion system valve control, auxiliary generator synchronization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical \u0026amp; Petrochemical:\u003c\/strong\u003e Reactor agitator speed control, pump and compressor automation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCogeneration (CHP):\u003c\/strong\u003e Steam valve regulation for combined heat and power plants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Treatment:\u003c\/strong\u003e Large pump variable speed control with hydraulic coupling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Woodward Controllers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWoodward 505 \/ 505E Digital Governor\u003c\/li\u003e\n\u003cli\u003eWoodward 2301 \/ 2301A Analog Governor\u003c\/li\u003e\n\u003cli\u003eWoodward 9905 Control System\u003c\/li\u003e\n\u003cli\u003eWoodward MicroNet Plus\u003c\/li\u003e\n\u003cli\u003eWoodward CPC-II Series (9907-1200, etc.)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePGPL457:\u003c\/strong\u003e Equivalent generic designation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8901-458 (PGPL458):\u003c\/strong\u003e Single-coil servo driver variant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8901-459:\u003c\/strong\u003e Three-channel servo drive module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5403-000:\u003c\/strong\u003e DDV servo valve (requires 8901-457 driver)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2421-855:\u003c\/strong\u003e VP series servo valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9907-101:\u003c\/strong\u003e Hydraulic actuator position transmitter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4407-001:\u003c\/strong\u003e Magnetic pickup speed sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the 8901-457 a speed controller or a servo driver?\u003c\/strong\u003e\u003cbr\u003eA: The 8901-457 serves \u003cstrong\u003eboth functions\u003c\/strong\u003e depending on configuration and system architecture. As a CPC-II module, it functions as a \u003cstrong\u003efrequency-to-voltage speed signal converter\u003c\/strong\u003e. As a PGPL457, it operates as an \u003cstrong\u003eelectro-hydraulic servo driver\u003c\/strong\u003e for valve positioning. Verify your application requirements before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 8901-457 and PGPL457?\u003c\/strong\u003e\u003cbr\u003eA: They are \u003cstrong\u003eidentical\u003c\/strong\u003e. \"8901-457\" is Woodward's internal part number; \"PGPL457\" is the generic series designation for the servo driver function.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can 8901-457 drive single-coil servo valves?\u003c\/strong\u003e\u003cbr\u003eA: The 8901-457 is optimized for \u003cstrong\u003edual-coil servo valves\u003c\/strong\u003e. For single-coil applications, use the \u003cstrong\u003e8901-458 (PGPL458)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What servo valves are compatible with 8901-457?\u003c\/strong\u003e\u003cbr\u003eA: Compatible with \u003cstrong\u003eMoog DDV series\u003c\/strong\u003e and \u003cstrong\u003eWoodward VP series\u003c\/strong\u003e dual-coil servo valves. Verify coil impedance and current requirements match the ±40 mA output rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I calibrate the 8901-457?\u003c\/strong\u003e\u003cbr\u003eA: Use the front-panel \u003cstrong\u003eGain\u003c\/strong\u003e and \u003cstrong\u003eZero\u003c\/strong\u003e potentiometers. Start with Gain at mid-position and Zero centered. Apply a test signal and adjust until valve\/sensor response matches input linearly. For CPC-II pressure control, verify 4 mA = minimum pressure (e.g., 0.15 bar) and 20 mA = maximum pressure (e.g., 10 bar).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the discrete inputs and outputs on the CPC-II variant?\u003c\/strong\u003e\u003cbr\u003eA: The CPC-II includes \u003cstrong\u003e2 discrete inputs\u003c\/strong\u003e (Master Designation, Redundant Mate In Control) and \u003cstrong\u003e3 discrete outputs\u003c\/strong\u003e (Alarm\/Shutdown Status, redundant indication). Inputs accept dry contacts or open-drain switches to isolated ground. Outputs require external 24 V supply and can be configured as normally open or normally closed.\u003c\/p\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":53763854139576,"sku":"8901-457","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/8901-457.png?v=1783925614","url":"https:\/\/www.globalpetroparts.com\/products\/woodward-8901-457-cpc-ii-digital-speed-controller-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}