ESD 5550E Electrical Generator Speed Control Governor Unit ESD5550E

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The ESD5550E Speed Control Unit is an all electronic device designed to control engine seed with fast and precise response to transient load changes. This closed loop control, when connected to a proportional electric actuator and supplied with a magnetic speed sensor signal, will control a wide variety of engines in an isochronous or droop mode. It is designed for high reliability and built ruggedly to withstand the engine environment.

Simplicity of installation and adjustment was foremost in the design. Non-interacting performance controls allow near optimum response to be easily obtained.

The primary features of the Speed Control Unit ESD5550E are the engine STARTING FUEL and SPEED RAMPING adjustment. The use of these features will minimize engine exhaust smoke experienced prior to attaining engine operating speed.


InputSupply12 or 24 VDC Battery System (Transient and Reverse Voltage)
PolarityNegative Ground (Case Isolated)
Power Consumption50 ma continuous plus actuator current
Actuator Current Range @77F
(25C) – (Inductive Load)
Min.2.5 Amps; Max. 10Amps continuous
Speed Sensor Signal0.5-120 Volts RMS
Speed switch Relay
Contacts(N.O.and N.C)
10 Amps
PerformanceIsochronous Operation/Steady
State Stability
±0.25% or better
Speed Range/Governor1K to 7.5K Hz continuous
Speed Drift with Temperature±1% Max
Idle Adjust CW60% of set speed
Idle Adjust CCWLess than 1200 Hz.
Droop Range1-5% regulation
Droop Adj. Max. (K-L connected)400 Hz.,±75Hz. Per 1.0A change
Droop Adj. Min. (K-L connected)15Hz.,±6Hz. Per 1.0A change
Speed Trim Range±200 Hz
Remote Variable Speed Range500 – 7.5 Hz. Or any part there of Terminal Sensitivity
Terminal Sensitivity J100 Hz.,±15Hz / Volt @ 5.0 K Impedance
Terminal Sensitivity L735 Hz.,±60 Hz / Volt @ 65 K Impedance
Terminal Sensitivity N148 Hz.,±10 Hz / Volt @ 1 Meg. Impedance
Terminal Sensitivity P10 VDC Supply @ 20 ma Max
Speed witch adjustment range1000-10000HZ
EnvironmentalAmbient Operating
Temperature Range
-40 to +180°F(-40°+85°C)
Relative HumidityUp to 95%
All Surface FinishesFungus Proof and Corrosion Resitant
ReliabilityVibration1G @ 20 to 100 Hz.
Testing100% Functionally Tested
PhysicalDimensionsSee outline (FIGURE 1)
Weigh11.8 lbs.(820 grams)
MountingAny position, Vertical Preferred

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1 review for ESD 5550E Electrical Generator Speed Control Governor Unit ESD5550E

    December 24, 2022
    ESD5500E governor is highly responsive and automatically adjusts the engine speed in time to ensure a stable output from the generator set.
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