Product of the Month: ADB335 Series Actuator

The universal electric actuator is a rotary output, proportional servo.  Easy to install, built with precision bearings and no maintenance required, this electromechanical actuator is typically used for mechanical actuation of fuel system control levers for diesel and gaseous fueled engines.   An internal spring provides fail safe operation by forcing the actuator to the fuel shut off position when the actuator is de-energized. The design combines rapid transient response with a wide rotational angle for extended linear travel and proven reliability in the field.

  • 24 V DC
  • 3.3 lbf.ft (4.5 N m) Net Torque
  • 65° Shaft Rotation
  • Die-Cast Housing
  • Military Style Connector
  • Available Options:
    • Position Feedback Sensor
    • Mating Connectors, Straight and 90°
    • 12′ (3658 mm) Cable Harness Assemblies with Straight or 90° Connectors
    • Mounting – Vibration Dampeners

Application of the Month

BioWorks Energy LLC of Grand Blanc, MI built a custom biogas fueled co-generation unit using a 21.9L, V12 MAN E2842 engine.  Cogeneration (cogen) through combined heat and power is the simultaneous production of electricity with the recovery and utilization of heat. 

Cogeneration is a highly efficient form of energy conversion and achieves a primary energy savings of approximately 40% compared to the separate purchase of electricity from a utility company’s electrical grid and a separate gas boiler for onsite heating.


Gaseous fueled cogen units are typically used for commercial, residential, and industrial applications and can easily be configured with a GAC ATB (integrated actuator/throttle body assembly) controlled by a variety of digital or analog governors with an ‘Anti-Wind-Up’ PID feature that minimizes RPM over-shoot and/or under-shoot.  The ‘Anti-Wind-Up’ PID is specifically designed for gaseous fueled engines


BioWorks Energy LLC has specially configured their MAN engine combining GAC’s EEG7500 Enhanced Electronic Governor, operating in the positioning control mode, with an ATB552T2F14-24 integrated actuator/throttle body equipped with a position feedback sensor for the gaseous fuel control valve system.  The EEG7500 receives a 4-20 mA input signal from the PLC, controlling the ATB’s position to properly regulate the gas flow rate for all operating conditions.  Engine speed is regulated with the ESD5330 controller that features a unique power drive circuit specifically for large, higher current actuators.

Tip of the Month : How do I know if my speed sensor is working?

If you suspect the magnetic pickup is not functioning properly, measure its resistance by disconnecting the pickup leads and check the sensors with an ohmmeter. See the manufacturer’s specifications for acceptable values.

The output voltage of a magnetic pickup is affected by three factors.

  • Output voltage increases with increases in the surface speed of the flywheel teeth.
  • Voltage decreases as the air gap between the magnetic pickup and the flywheel teeth increases.  (The optimum air gap is typically 0.020” to 0.025” {0.5 to 0.65mm})
  • The voltage waveform is determined by the size and shape of the gear tooth in relation to the size and shape of the sensors pole piece.
Approximate MSP Resistance
Long Standard Model250 Ὡ max
Short Standard Model220 Ὡ max
Standard Metric Models250 Ὡ max
  1. Measure between the pickup case and leads with an ohmmeter for near infinite resistance.
  2. Confirm there are no open circuits, including the wiring harness and all connectors.
  3. Inspect the sensor for mechanical damage and remove any debris that might have accumulated on the pole piece. 
  4. Reset the air gap to 0.020” to 0.025” (0.5 to 0.65mm) and confirm that the sensor outputs a minimum of 1.0 VAC at cranking across the inputs to the speed control.

See GAC videos and playlists on You Tube for details!