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Governors America Corp. © 2020 Copyright All Rights Reserved
ESD5550-5570 Series Speed Control Unit
9-2020-E 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 de-
signed 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 con-
trol a wide variety of engines in an isochronous or droop mode. Designed
for high reliability and built ruggedly to withstand the engine environment.
ESD5550/5570 Series speed control unit features include:
• Simple installation
• Starting Fuel and Speed Ramping adjustments to minimize engine ex-
haust smoke prior to attaining engine operating speed
• Adjustable droop and idle operation
• Inputs for accessories used in multi-engine or special applications
• Protection against reverse battery voltage, transient voltages, acciden-
tal short circuit of the actuator and fail safe design in the event of loss of
speed sensor signal or battery supply.
• Light Force Actuation (ESD5570 only)
The ESD5550/5570 Series speed control unit is compatible with all GAC
proportional actuators except the ACB2001 electric actuator. When paired
with a GAC ADC100 Series electric actuator, 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 o current to actuator), unit automati-
cally turns back on when short is removed.
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