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        9905-021
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        • Lifecycle status

          Active / Available from OEM
          Current supply should be checked for the exact low-voltage, reverse-acting 2301A configuration before a governor replacement is approved.

        9905-021

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Woodward 9905-021 is a low-voltage 2301A load-sharing and speed control with a 0–200 mA reverse-acting output for one actuator.
        In Stock
        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
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        Technical specifications for 9905-021

        • Manufacturer:
          Woodward
        • Part Number:
          9905-021
        • Product Family:
          Woodward 2301A series
        • Product Type:
          2301A Load Sharing and Speed Control
        • Stock:
          1
        • Manufacturer:
          Woodward
        • Exact part number:
          9905-021
        • Control family:
          2301A Load Sharing and Speed Control
        • Power supply:
          20–40 V DC
        • Actuator output:
          0–200 mA, single actuator
        • Control action:
          Reverse acting
        • Ramp feature:
          No deceleration ramp
        • Speed input:
          Magnetic pickup
        • Operating modes:
          Isochronous or droop
        • Protection boundary:
          Independent overspeed shutdown required
        • Commissioning boundary:
          Actuator direction and load sharing verified
        • Weight:
          1.86 kg
        • Estimated shipping dimensions:
          38.7x18.2x6cm
        • Tariff Code:
          8537109090
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Control Adjustments Operating States Signal Chain Applications

        Features:

        • Low-voltage supply: uses the documented 20–40 Vdc input range.
        • Reverse-acting output: drives one 0–200 mA actuator.
        • Generator governing: supports speed control and load-sharing operation.
        The complete part number selects a specific 2301A hardware configuration rather than a generic governor family member.

        Reverse-acting behavior, actuator-current range and the absence of a deceleration ramp directly affect wiring and operating response.

        A controlled commissioning sequence proves pickup input, actuator response, speed stability and load-sharing signals while retaining independent overspeed protection.

        Apter Power can help review the actuator, supply and generator-governor context for Woodward 9905-021 enquiries.
        Woodward 9905-021 2301A Load Sharing and Speed Control Manuals,Datasheets,LinkImportant Notice: A qualified Woodward English manual covering exact model 9905-021 was identified; a branded PDF requires preview approval before attachment.
        • Speed-range selection: places the rated-speed set point inside the controller's usable adjustment span, leaving room for commissioning rather than forcing the control to an end stop.
        • Gain response: determines how strongly 9905-021 reacts to a speed or load error; excessive gain promotes hunting, while insufficient gain slows recovery.
        • Stability damping: works with gain to settle actuator movement after a disturbance, so the two adjustments are tuned as a pair at operating conditions.
        • Load-gain alignment: scales the load-sharing path to generator output, preventing a correctly governed machine from carrying the wrong share of parallel load.
        • Isochronous operation: holds the selected speed on an isolated generator or in a compatible load-sharing scheme instead of allowing steady-state droop.
        • Droop operation: creates a defined load-versus-speed relationship for operation against an independently governed source or an infinite bus.
        • Idle and rated references: provide separate operating targets for warm-up and normal generation, making the transition part of the governor sequence rather than a wiring-only event.
        • Reverse-acting control: matches 9905-021 to an actuator system whose required fuel-command direction is opposite that of a forward-acting 2301A configuration.
        • Magnetic-pickup input: supplies the shaft-speed feedback from which the controller forms speed error; a weak or lost pickup signal breaks that control path.
        • Actuator command: the single 0–200 mA path converts the controller's correction into fuel-actuator movement, so actuator direction and travel determine the physical response.
        • Load-sharing input: adds generator-load information to speed control when units operate in parallel, allowing the governor to coordinate loading rather than speed alone.
        • Low-voltage supply: the 20–40 Vdc version must remain on its intended supply class; a different 2301A supply variant is not created by changing settings.
        • Isolated generator sets: isochronous speed control where one governor establishes the frequency reference.
        • Paralleled generator sets: coordinated speed and load sharing in a compatible 2301A scheme.
        • Engine-driven generation: governing for documented diesel or gasoline prime-mover applications.
        • Turbine-driven generation: speed control for documented steam- or gas-turbine generator applications.
        Description
        9905-021 is a Woodward 2301A load-sharing and speed control configured for a 20–40 Vdc supply, one 0–200 mA actuator and reverse-acting operation. The exact configuration does not include a deceleration ramp.

        In a generator-governor application, 9905-021 can operate in isochronous or droop modes while participating in load sharing. Replacement planning must preserve the speed-range selection, load-signal wiring, actuator polarity and the independent overspeed shutdown provided by the prime-mover system.

        Before commissioning 9905-021, confirm the supply polarity and voltage, actuator current direction, magnetic-pickup signal, load-sharing connections and idle/rated references. Use the Woodward procedure to verify stable speed control before reconnecting the generator to load-sharing service.
        Alternative Names
        9905-021 Woodward 9905-021 WOODWARD 9905-021 9905 021 9905–021 2301A 9905-021 Woodward 2301A 9905-021
        Technical notes
        9905-021 is the 20–40 Vdc, single-actuator, 0–200 mA reverse-acting 2301A variant with no deceleration ramp. Confirm actuator direction, pickup wiring, speed range and independent overspeed protection before startup. Selecting a forward-acting or different-current variant can drive the fuel command in the wrong direction.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What makes 9905-021 different from another 2301A controller?
        It uses 20–40 Vdc power, a single 0–200 mA actuator output, reverse-acting control and no deceleration ramp.
        Why must actuator direction be checked before starting 9905-021?
        Reverse-acting hardware changes the relationship between controller output and fuel command; the wrong actuator or wiring assumption can produce unsafe speed response.
        Which protection must remain independent of 9905-021?
        Woodward requires an independent overspeed shutdown appropriate to the prime mover because the electronic governor is not the sole overspeed protective device.
        What should be saved before replacing 9905-021?
        Record terminal wiring, speed-range selection, magnetic-pickup data, actuator current and polarity, droop or isochronous settings, and load-sharing connections.
        How should 9905-021 be tested before load sharing is restored?
        Verify supply and pickup signals, prove correct actuator direction, establish stable idle and rated speed, then test droop or load-sharing response under the approved generator procedure.
        Can a 2301A with a deceleration ramp replace 9905-021 without review?
        No. The ramp feature changes operating behavior, so the exact hardware configuration and turbine or engine application must be reviewed before substitution.

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