Variable Speed Electronic Governor for Telecom Gensets (EG1299)

SEDEMAC's variable speed solution comprises of an Engine controller EG1299 and an actuator. SEDEMAC's EG1299 controller is a modern engine controller for telecom genset applications with user-friendly HMI and full graphics LCD. The EG1299 controller provides variable speed governing feature along with the option to switch over 0% droop governing with paralleling support.

The EG1299 controller also offers over-speed and under-speed protection, and load metering. RS485 port is provided for supporting remote communication. Features such as real time clock (RTC), extensive event logging and magnetic pick-up sensing (for RPM) are also provided to support special customer requirements.

The actuator is designed and customized for precision motion control applications for engines with mechanical fuel systems. The actuator sits on the engine and controls the stop/throttle lever of the fuel injection pump (FIP) to control the engine speed.


EG 1299 enables variable speed action of genset engines. Variable speed genset action involves changing the speed of the engine (and therefore the frequency at which power is generated) depending on the load. This makes sense in telecom towers for two reasons.

  • Most gensets used in this application operate for significant periods of time under part-load operation. Variable speed capability allows lower speed, higher torque operations under part-load conditions leading to fuel saving. See figure

  • Microwave electronics of telecom towers are DC powered. Typically, an SMPS is used to convert AC power (from the grid or DG) into DC primarily to charge battery banks. The SMPS is (largely) agnostic to input frequency negating the need to produce DG power which is synchronous with the frequency of the grid


  • Provides variable speed governing as per load versus RPM configuration
  • Easy shift from variable speed governing feature to fixed speed governing through key/digital input
  • Full graphics backlit LCD display with power saving mode
  • Monitors engine safety parameters, over-speed and under-speed
  • Supports the magnetic pick-up unit interface for engine speed sensing
  • Versatile software capable of handling "events" during operation; event log for 100 events with real time clock (RTC) stamps
  • Built-in electronic governor module; directly connects to SEDEMAC's rotary actuators* to guarantee ISO8528:G3 class performance for 0% droop mode; accepts target speed bias input (0 – 5V) from an external load sharing module (LSM)
  • Incremental counters for engine starts, running hours, kWh, kVAh
  • RS485 port for communication through MODBUS with other devices
  • Supports end-of-line parameter flashing at OEMs; offers multiple level passwords
  • Access to each parameter through PC software or keypad


Environmental Specification
  • Operating / Storage Temperature: -20°C to 65°C / -30°C to 70°C as per IEC 60068-2-1, 2
  • Vibration: 2G in X, Y, Z axis as per IEC 60068-2-6
  • Humidity: 0% to 95% RH as per IEC 60068-2-78
  • EMI / EMC: Compliance as per IEC 61000-6-2, 4
  • Power Supply: 8V – 32V DC continuous
  • Ingress Protection: IP65 for front face with optional gasket as per IEC 60529
  • Shock: 15g for 11 mS, compliance as per IEC 60068-2-27
Technical Specifications
  • Maximun Standby Current: ~0.08A @ 12 or 24V DC
  • Digital Output: 6 x 1A high-side drivers configurable for over speed, under speed, engine running etc.
  • Digital Input: 5 switch-to-ground inputs configurable for engine start, engine stop, emergency stop
  • Analog Input: 1 analog input (0V - 5V) for E – Gov speed bias
  • E-governor Module Interface: 
    1A, 2-phase output for Rotary Actuator
    0V – 5V input for target speed bias; 2.5V for zero bias
  • Load Current Measurement: 0 - 5A AC RMS for Current Transformer (CT) secondary
  • Magnetic Pickup Measurement: 0.2V – 45V AC RMS @10 Hz – 10 kHz
  • EG1299 Controller Dimensions: 
    External dimensions: 139 mm x 114 mm x 37.5 mm 
    Mounting panel cut: 118 mm x 93 mm
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