RSC Series
 Upgrades GAC Governors to Wide Range Variable Speed Control System
• Typical Applications: Marine and Heavy Equipment
• Compatible with ESD5100, 5200, and 5500 Series
• 0-5VDC or 4-20mA Input, Adjustable Speed Range 
• Acceleration / Deceleration Control



RSC671 Series

The RSC671 Speed Ramping Control is a full-time, linear, electronic variable speed control module. The RSC671 is designed to smoothly accelerate and decelerate an engine at independently adjustable rates. Ramping of speed is useful in limiting the smoke and noise generally associated with a step change in engine speed.   

 See the product details 

APPLICATION OF THE MONTH: 

PSP Engines, of Humble Texas, converted a number of Caterpillar 2.2 engines to electronic governing.  They selected the GAC EEG6550 Digital Governor and ALR190-P04-12 actuators and MSP6741 magnetic speed sensors for the systems' ease of installation.  The ALR190 series actuator mounts directly onto the fuel injection pump, in place of the electric shut-off solenoid, and directly engages the fuel control rack.  No external linkages or mounting bracketry required.

The EEG6550 digital governor was selected for having the most applicable combination of features, since it can directly take in a variable speed voltage or current input similar to the RSC series. These engines will be installed as water pump drives and the speed ramping control significantly reduces visible exhaust smoke as they accelerate under load.  The Light Force governor feature scales the PID governor range of adjustment for these small, low current, actuators providing the best resolution for ease of tuning these governor response parameters.

ALR190-P04-12/24 PULL TYPE LINEAR ACTUATOR ON CATERPILLAR C2.2 ENGINE



The conversion included two MSP6741 speed sensors shown threaded into the bell housing.

MSP6741



FAQ OF THE MONTH: DID YOU KNOW THE MAJORITY OF NOT STARTING PROBLEMS ARE DUE TO THE SPEED SETTING POTENTIOMETER SET TOO LOW?

Over the last couple of months, the technical department has answered multiple phone calls about engine no starts after the governor is replaced. Please remember all GAC analog governors are equipped with a 25 Turn Speed Potentiometer for the speed setting.

The potentiometer is clutch style at each end so it will not break if you go too far in either direction. You will hear a light click at each end of its travel. Clockwise increases speed, counterclockwise decreases speed.

Example: A typical ESD5500E unit is capable of 0-7.4 kHz of frequency response. Using a flywheel with approximately 100 teeth, this equates to approximately 0.296kHz per turn which in turn is approximately 177 RPM per turn. An engine requiring a speed of 1500 RPM would require approximately 8.5 turns on the speed potentiometer. The same engine running at 1800 RPM would require approximately 10.5 turns on the speed potentiometer. While not all actuators, flywheel teeth counts, and controller combinations are the same, this is an example.

 


GAC  WILL BE CLOSED MONDAY, JANUARY 1ST, 2018 FOR NEW YEARS DAY!