GAC ESD5550 / 5570 SERIES SPEED CONTROL UNIT SPECIFICATIONS
The ESD5550 / 5570 Series speed control unit is an all electronic device designed to control engine speed 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 ESD5550 / 5570 Series speed control unit are the engine STARTING FUEL and SPEED RAMPING adjustments. The use of these features will minimize engine exhaust smoke experienced prior to attaining engine operating speed.
Other features include; Adjustable droop and idle operation, inputs for accessories used in multi-engine or special applications, protection against reverse battery voltage, transient voltages, accidental short circuit of the actuator and fail-safe design in the event of loss of speed sensor signal or battery supply.
The ESD5550 / 5570 Series speed control unit is compatible with all GAC proportional actuators except the ACB2000 electric actuator. When the ESD5550 / 5570 Series speed control unit is used with a ADVC100 Series electric actuator, the DROOP adjustment range will be less due to this actuator's low current demand.

FERFORMANCE
Isochronous Operation/Steady State Stability: ± 0.25% or better
Speed Range / Governor: 1K-7.5K Hz continuous
Speed Drift With Temperature (Governor and Speed Switch): ± 1% maximum
Idle Adjust CW: 60% of set speed
Idle Adjust CCW: Less than 1200Hz
Droop Range: 1-5% regulation
Droop Adj. Max (K-L Jumpered): 400Hz., ± 75Hz. Per 1.0A change
Droop Adj. Max ( K-L Jumpered): 15Hz., ± 6Hz. Per 1.0A change
Speed Trim Range: ± 200Hz
Remote Variable Speed Range: 500-7.5K Hz, or any part thereof

Terminal Sensitivity
J: 100Hz., ± 15Hz / Volt@5.0K impedance
L: 735Hz., ± 60Hz / Volt@65K impedance
N: 148Hz., ± 10Hz / Volt@1 Meg impedance
P: 10VDC Supply@ 20ma Max
Speed Switch Adjustment Range: 1000 ·10000Hz.

ENVIRONMENTAL
Ambient Operating Temperature Range: -40° +180° F (-40° ~85º C)
Relative Humidity: Up to 95%
All Surface Finishses: Fungus Proof & Corrosion Resistant

INPUT POWER
Supply: 12 or 24VDC Battery Systems (transient & reverse voltage protected)
Polarlty: Negative ground (Case isolated)
Power Consumption: 50 ma continuous plus actuator current
Actuator Current Range @ 25º C(77° F): Min. 2.5Amps Max. 10 Amps continuous
Speed Sensor Signal: 0.5-120 Volts RMS
Speed Switch Relay Contacts(N.O.and N.C.): 10Amps

RELIABILITY
Vibration: 1G @ 20-100Hz
Testing: 100% Functionally tested

PHYSICAL
Dimensions: See outline (FIGURE 1)
Weight: 1.8 lbs. (820 grams)
Mounting: Any position, vertical preferred