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Governors America Corp. © 2021 Copyright All Rights Reserved
ESD5550-5570 Series Speed Control Unit
1-2021-E1
PIB1003
ESD5550 & ESD5570 Series
Speed Control Unit
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SPECIFICATIONS
Performance
Isochronous / Steady State
Stability
± 0.25 % or better
Speed Range / Governor
1 K - 7.5 K Hz continuous
Speed Drift with Temperature
±1 % MAX
Idle Adjust CW
60 % of set speed
Idle Adjust CCW
Less than 1200 Hz
Droop Range
1 - 5 % regulation
Droop Adjustment MAX
(K-L Jumpered)
400 Hz, ±75 Hz per 1 A change
Droop Adjustment MIN
(K-L Jumpered)
415 Hz, ±75 Hz per 1 A change
Remote Variable Speed Range
500 - 7.5 Hz or any part thereof
Speed Trim Range
± 200 Hz
Terminal Sensitivity J
L
N
P
100 Hz ±15 Hz/V @ 5.0 kΩ Impedance
735 Hz ±60 Hz/V @ 65 kΩ Impedance
148 Hz ±10 Hz/V @1 MΩ Impedance
10 V DC Supply @ 20 mA MAX
InPUT / oUTPUT
Operating Voltage
12 VDC or 24 VDC (Transient and
Reverse Voltage Protected)*
Polarity
Negative Ground (Case Isolated)
Power Consumption
50 mA continuous plus actuator current
Actuator Current Range at 77 °F
(25 °C) - Inductive Load
Minimum 2.5 A
10 A Peak**
Speed Sensor Signal
0.5 to 120 V RMS
Speed Switch Relay Contacts
(N.O. and N.C.)
10 A
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INTRODUCTION
reLIaBILITY
Vibration
5 g @ 20 - 500 Hz
Testing
100% Functional Testing
envIronmenTaL
Ambient Temperature Range
-40° to 85 °C [-40° to 180 °F]
Relative Humidity
up to 95 %
Shock
20 g @ 11 ms
All Surface Finishes
Fungus Proof, Corrosion Resistant
comPLIance / STanDarDS
Agency
CE, RoHS, Lloyds Register,
DNV/GL, Bureau Vertas
PHYSIcaL
Dimension
See Section 3, Installation
Weight
1.8 lbf [0.82 kgf]
Mounting
Any position, vertical preferred
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, can control a wide variety of engines in an iso-
chronous or droop mode. Designed for high reliability and built ruggedly to withstand
the engine environment. ESD5550/5570 Series speed control unit features include:
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Simple installation
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Starting Fuel and Speed Ramping adjustments to minimize engine exhaust
smoke prior to attaining engine operating speed
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Adjustable droop and idle operation
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Inputs for accessories used in multi-engine or special applications
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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.
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Light Force Actuation (ESD5570 only)
The ESD5550/5570 Series speed control unit is compatible with all GAC proportional
actuators (except ACB2001). When paired with a GAC ADC100 Series electric ac-
tuator, DROOP adjustment range is less due to the ADC100’s low current demand.
* Protected against reverse voltage by a series diode. A 15 amp fuse must be installed in
the positive battery lead.
** Protected against short circuit to actuator (shuts off current to actuator), unit automati
-
cally turns back on when short is removed.
