2301E Load Sharıng Speed Controller

Drop-ın replacement for the popular 2301D controller


Woodward’s 2301E provides load sharing and speed control of generators being driven by diesel or gaseous engines. With built-in flexible configuration software, application variations can now be selected using an external computer (PC). Changing the application to accommodate engine speed range, gear teeth, and selection of forward or reverse acting is simply a matter of software setup.

The 2301E controller is backward compatible with existing 2301D products, since it has the same footprint and mounting configuration. The new controller insures the ongoing availability of a proven, versatile product with enhanced features:


  • Separate RS-232 and RS-422 serial ports, both with 9-pin connectors
  • Additional status LEDs for power and RS-422 communications
  • Fault data logging capability with 16 seconds of data collected every 10 milliseconds on the event of a shutdown, peak speed and load detection
  • Low-current PWM output for driving Woodward’s L-Series, F-Series, P-Series and PISC actuators
  • New terminal blocks accommodate additional I/O, with a majority of the terminals located in the same position as the 2301D models.
  • Major compliance certifications

Power Supply Rating

18–36 Vdc (SELV)

Power Consumption

Less than or equal 20 W nominal

Maximum Altitude

3000 m / 10 000 feet

Input Supply Voltage /
Typical Input Supply Current

18 V / 589 mA
24 V (nominal) 431 mA
32 V / 319.6 mA

Inrush Current

7 A for 0.1 ms

Steady State Speed Band

±0.25% of rated speed

Magnetic Pickup

100–25 000 Hz (300–3600 rpm)

3-Phase Current Transformer

3-7 A rms at full load, CT input burden at full load is 0.1 VA per phase

3-Phase PT Burden

100–240 Vac line-to-line, 50–400 Hz. PT input burden is between 1.5 VA and 1.7 VA per phase at 240 Vac, and between 0.4 VA and 0.5 VA per phase at 120 Vac.

Discrete Inputs (8)

3 mA at 24 Vdc, impedance approximately 5.2 kA

Remote Reference Input

4–20 mA, 1–5 Vdc

SPM-A Input

±2.5 Vdc, externally powered

Analog Output #1

0–20 mA, 4–20 or 0–200 mA to actuator, software configurable

Analog Output #2

0–20 or 4–20 mA, internally powered, configurable, power by external +12 Vdc or +24 Vdc source, max output current 200 mA

Discrete Output Ratings

Low-side drivers with overvoltage protection, 200 mA maximum

Communication Ports

RS-232: 9-pin connector, RS-422: 9-pin connector, 9600 to 115 200 baud, full duplex

Ambient Operating Temperature

–40 to +70 °C (–40 to +158 °F)

Storage Temperature

–40 to +105 °C (–40 to +221 °F)


Lloyd’s Register of Shipping, Test Specification No. 1, 1996, Humidity Test 1, 95% at +20 to +55 °C (+68 to +131 °F) condensing

Mechanical Shock

US MIL-STD 810C, Method 516.2, Procedure I (basic design test), Procedure II (transit drop test, packaged), Procedure V (bench handling)

Equipment Classification

Class 1 (grounded equipment)

EMC Immunity Environment

Marine Type Tests & EN 61000-6-2
IEC 61000-4-2, ESD ±6 kV/±8 kV
IEC 61000-4-3, RS 10V/m + AM 80-3000 MHz
IEC 61000-4-4, EFT ±2 kV Power & I/O
IEC 61000-4-5, Surge ±1 kV I/O CM, ±0.5/±1.0 kV dc power
DM/CM, & ±1.0/±2.0 kV ac power DM/CM
IEC 61000-4-6, CRF 10 VRMS + AM 0.150-80 MHz
Marine Type Test CLFI 3.6 VRMS or 2W, 50 Hz to 20 kHz
WWD (Marine) CLFI 3.6-0.36 VRMS or 2.0–0.2 W, 20 kHz to 150 kHz.

EMC Emission Environment

Marine Type Tests & EN 61000-6-4
Marine General Distribution Zone per CISPR 16
EC EN 61000-6-4 Industrial Limits (Class A)
Operating Modes

The 2301E has four operating modes:

Speed Control

Has multiple dynamics flexibility. Will work on pumps or compressors. Has capability for remote 4–20 mA speed reference through a configurable analog input.

Isochronous Load Sharing

Is compatible with most existing analog load sharing speed control systems. Now with soft load and unload capability.

Droop Base Load

Adjustable load control using discrete raise and lower contact

Isochronous Base Load

Provides constant load level operation against a utility bus. The load setting may be fixed orchanged using discrete raise and lower inputs or a remote 4–20 mA input.


Key features of the 2301E controller include:

  • Engine / generator or pump applications
  • Multiple dynamics
  • Manifold Air Pressure (MAP) limiter
  • Torque limiter
  • Low-speed sensing functionality
  • Remote speed and load reference
  • Soft load transfer
  • Automatic idle-to-rated switching
  • Load rejection / load pulse option
  • Idle droop function
  • Optional Modbus® serial communications
  • Adaptive speed sensing algorithm
  • Two serial ports
  • Data-logging capability
  • 2301E ToolKit service tool or Control Assistant programmable [Note that the technical manual is embedded in the Service Tool]
  • Ordinary or hazardous location chassis

® Modbus is a trademark of Schneider Automation Inc.




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