Electronic Governors


GAC’s Speed Control Units are precise speed controls designed and manufactured in various configurations to meet application requirements using the latest analog and digital control technologies. Reverse battery polarity and fail-safe protection in the event of loss of speed sensor signal or battery voltage is incorporated in every GAC Speed Control Unit. A wide variety of application needs can be satisfied with GAC’s constant or variable speed governing, in isochronous or droop operation. All circuit boards are hard potted or conformally coated to be vibration and moisture resistant.

Digital Governors Digital Accessories Analog Governors Analog Accessories

Digital Governors

GAC digital governors are solid state microprocessor based speed control units that offer precise (+/- 0.25%) speed control with fast response to transient load changes in isochronous and droop modes.

DPG Series Digital Pump Governor – SmartVU PC Software
Governor and Actuator Combo for BQ Series Inline Fuel Injection Pump /  SmartVU PC Software
EEG Series Enhanced Electronic Governor – Replaces the EDG5500/ Improved and Simplified PID / Complete Fault Protection & Logging / Aux Input / Variable Speed, Droop, and Isochronous Governing
EEG6500 Multi-VDC / Built-In Display / Terminal Strip / Normal and Low Current Actuators
EDG Series Electronic Governor – No Analog Drift – Selectable Isochronous or Droop Governing – Overspeed Sensing – Adjustable Starting Fuel Strategy – Black Smoke Reduction – Variable Speed Governing – GAC AUX/Load Sharing
EDG5500 Simple LCD User Interface / Fast Set-up With 5 Push Buttons, No Potentiometers / A Near Drop-in Replacement for ESD5500E
EDG6000 Multiple PID Control for Full Tuning of Operating Range / IP67 Sealed Case and Connector / RS232 and CAN J1939 Communications /  SmartVU PC Software
SDG Series – Smart Digital Governor / Three Fixed and 1 Variable Speed / Overspeed Shutdown Protection / SmartVU PC Software
SDG514-01-01 Deutsch Connector / Resistive Input / Variable Speed
SDG524-01-01 Deutsch Connector / Voltage Input / Variable Speed 
SDG725-01-01  Multi-VDC / SMARTTOUCH Keypad / Fixed & Variable Speed / Droop 

Cable Harness
CH1330 Cable Harness for the SDG514/SDG524
CH1520 Cable Harness for the EDG6000
Mating Connectors
EC1330 Deutsch 12 pos. Mating Connector for SDG514/SDG524
EC1502 14-Pin Mating Connector for EDG6000
EC1528  Connector Kit for EDG6010-DM 
Test Equipment
 TSE050       Magnetic Speed PickUp Simulator
 TSE307  EDG6000 Programming Interface

Analog Governors

The ESD, ESC and ECC Series speed control units are 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 or generator voltage, 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.

ECC Series – Genset Voltage Frequency / Isochronous Speed Control / Full PID Setting / Designed to Govern from Frequency Signal of an AC Generator / No Magnetic Speed Pickup Needed
ECC328-12or-24 (CE) 12 or 24 VDC / Light Force
ESC Series – Electronic Speed Control / 12-32 VDC / Wide Speed Control Units 
ESC61C-7 MIL Connector
ESC61C-17 MIL Connector / Variable Speed
ESC63C-7 Terminal Strip
ESC63C-23  Terminal Strip / Idle Run Feature
ESD1000 Series –  Isochronous Operation / Steady State Stability / Gain Adjustment
ESD1000-12 or -24 12 or 24 VDC / Wire Leads
ESD1100-12 or -24 12 or 24 VDC / Terminal Strip
ESD2100 Series – Isochronous Operation / Adjustable PID Functions
ESD2110 Multi VDC
ESD2200 Series – Transient Voltage Protector / Hard Potted
ESD2210-12 or -24 (CE) 12 or 24 VDC
ESD2241-24 (CE) 24 VDC / Idle Circuit
ESD2244-12 or -24 (CE) 12 or 24 VDC / Light Force
ESD2300 Series – Variable Speed Operation / Adjustable PID Functions / Overspeed Speed Switch / Foot Pedal
ESD2351 12 VDC / Operates with Williams Foot Pedal (FP201, FP202)
ESD2352-12 12 VDC / Operates with Morse Foot Pedal
ESD2400 Series – Isochronous Operation / Adjustable PID Functions / Idle Control / Anti-Windup Circuit / Hard Potted
ESD2401-12 or -24 12 or 24 VDC / Designed for Non-Feedback GAC Actuators
ESD2402-12 or -24 12 or 24 VDC / Light Force / Designed for Non-Feedback GAC Actuators
ESD5100 Series – Isochronous, Variable, & Droop Operation /Adjustable PID Functions / Variable Speed Trim / Switchable Droop and Idle Control / Auxiliary Power Supply /10 VDC Supply for Accessories 
ESD5111 (CE) Multi VDC / Standard Unit
ESD5111T (CE) Multi VDC / Temperature Compensated
ESD5119 (CE) Multi VDC / EFC Reverse Acting
ESD5120 (CE) Multi VDC / Light Force
ESD5131 (CE) Multi VDC / Selectable Soft Coupling and Lead Circuit
ESD5159 (CE) Multi VDC / Expanded Frequency Range 10.5kHz
ESD5160 (CE) Multi VDC / EFC Reverse Acting / Extended Speed Range
ESD5161 (CE) Multi VDC / Expanded Auxiliary Input Range
ESD5200 Series – Speed Anticipation Circuit / Adjustable PID Functions / Reverse Voltage Protection / Overspeed Contact
ESD5221 (CE) 10 Amp Relay Output / Isochronous, Variable, & Droop Operation / Single Element Speed Switch
ESD5300 Series – Isochronous, Variable, & Droop Operation / Dual Gain – Idle and Rated / Overspeed & Crank Termination / Speed Ramping / Starting Fuel Control / Power Drive Circuit / Adjustable PID Functions / Idle Speed Adjustment / Auxiliary Accessory Outputs / Unique Actuator Power Drive Circuit / Soft Coupling
ESD5330 24 VDC / Standard Unit
ESD5340 24 VDC / Dynamic Starting Aid Equipped
ESD5500-II Series – Suitable for Both Gaseous & Diesel Applications / Light Force & Standard Actuators / Selectable Dither Function / LED Indicators
ESD5500-II Isochronous, Variable & Droop Operation / Speed Ramping / Starting Fuel Control / Enhanced Droop Control / Anti Wind-Up Circuit / Soft Coupling / Selectable Light-Force Capability / Dither Function
ESD5500E Series – Isochronous, Variable, & Droop Operation / Switchable Droop Control / Starting Fuel Control / Speed Ramping / Soft Coupling / Overspeed Control Switch / Auxiliary Output
ESD5500E (CE) Multi VDC / Standard Unit 
ESD5520E (CE) Multi VDC / Light Force 
ESD5522E (CE) Multi VDC / Light Force / EFC Forward Acting / Enhanced Droop
ESD5526E (CE) Multi VDC / Anti Wind-Up Circuit /
(For Use With ATB Gas Applications)
ESD5528E (CE) Multi VDC / Anti Wind-Up Circuit /
(For Use With ATB Gas Applications)
ESD5550/5570 Series –  Isochronous, Variable, & Droop Operation / Overspeed With LED / Starting Fuel Control / Speed Ramping / Soft Coupling / Lead Circuit / Auxiliary Output
ESD5550 (CE) Multi VDC / Standard Unit 
ESD5550M  (CE) Multi VDC / Expanded Gain and Stability Range
ESD5570 (CE) Multi VDC / Light Force
SSW Series – Repeatability Set Points / 12 or 24 VDC Operation / Overspeed Test Function / Tachometer Output
SSW674 One Element – Overspeed
SSW675 Two Element – Overspeed & Crank Termination
SSW676 Three Element – Overspeed, Crank Termination, & Parallel

RSC671 Ramp Generator – Ramp Up/Down – Programmable
RSC672 Ramp Generator – Ramp Up / Generator Set Applications
DDM101 Dual Driver Module -Drives 2 Actuators Simultaneously
DFM100 Bi-Fumigation Module – Drives 1 Gaseous, 1 Diesel
Foot Pedals
FP201 Foot Pedal / Vertical Mount
FP202 Foot Pedal / Horizontal Mount
Mating Connector
EC1200 ESC61C – Straight
TP501 1 Turn – 5K with Knob
TP502 10 Turn – 5K with Knob
TP503 10 Turn – 5K with Locking Shaft
TP504 1 Turn – 20K with Knob / Droop Control
TP508 10 Turn – 20K with Locking Shaft
TP509 10 Turn – 20K with Knob
TP510 10 Turn – 1K
TP511 10 Turn – 10K
TP521 Multiple Variable Speed Control / Vernier Dial
Test Equipment  
 TSE050 Magnetic Speed PickUp Simulator