120 SERIES ELECTRIC ACTUATOR

120 SERIES ELECTRIC ACTUATOR



INTRODUCTION

The 120 series electric actuator is a rotary output, linear torque, proportional servo. This electromechanical actuator is typically used as an engine fuel control positioning device. An internal spring provides tail sate operation by forcing the actuator to the fuel shut off position when the actuator is de-energized. This design combines fast operation, multi voltage usage, wider rotation angle, and proven reliability, The actuators can operate directly on 12, 24, or 32 volt battery supplies.

The speed of operation of the actuator is typically faster than competitive actuators, thus it provides more stable and rapid response to transient conditions. Applications include most block pumps. with or without mechanical governors. distributor type pumps, and small sized carbureted engines. The wide angle of rotation expands the application to a wider variety of engines.



DESCRIPTION

The actuator is an electromagnetic servo device which can be integrated into a closed loop control system. An engine control system can be described as follows. An electrical signal is
generated by a magnetic speed sensor which is proportional to engine speed. This signal is sent to the electronic speed control unit which compares it to the preset engine speed setting. II the
magnetic speed sensor signal and the preset engine speed setting are not equal, a change in current from the speed control unit to the actuator will change the magnetic force in the actuator.

The rotation of the actuator shaft will then adjust the fuel to the engine to cause the engine speed to be equal to the preset engine speed setting. Shaft rotation is proportional to the amount of actuator current and counterbalanced by the internal spring.
Since the design has no sliding parts and is totally sealed, outstanding reliability is achieved, A single compression spring is used to improve reliability. No maintenance is necessary.

SPECIFICATIONS
PERFORMANCE
Available Torque ............ Max 1.0 Ib-ft (1.4 Nm)
Maximum Operating Shaft Angular Travel ACB/ACE.......20土1 degree CW/CCW
ADB/ADC........25士1 degree CW/CCW
POWER INPUT
Operating voltage (32v for ACB 120/ACE/ADB 120 only).........12, 24, or 32 VDC
Normal Operating Current.......2Aat 12 VDC
........1 A at 24/32 VDC
Maximum Current-Continuously Rated........6A at 12 VDC
........3A at 24/32 VDC
ENVIRONMENTAL
Temperature Range........-65° to + 200° F (-540 to+ 95° C)
Relative Humidity.........up to 100%
Weight........4.50 Ibs, (2.05 kg)
Mounting.........Any position, electrical connector at the top-preferred
RELIABILITY
Vibration.......Up to 20G @ 50-500Hz.
Testing........100% Tested
MATING HARDWARE
Connector ACB/ACE/ADB 120....... EC1000/MS3106R 14S-6S (6 pins)
ADC 120........Supplied with Actuator
Lever.....ACB/ACE/ADB 120......LE1400-1
ADC 120......LE1500-1
Rod End Bearings (to attach a #10-32 THD linkage rod to the lever)......BR 100 (right hand)
BR 101 (left hand)


INSTALL ATION
The actuator must be rigidly mounted as close as possible to the fuel control lever of the engine. Normal vibration from the engine will not affect the operation o1 the actuator. The preferred mounting is with the electrical connector at the top.Linkage arrangement o1 any actuator system is always important,high quality rod end bearings should be used. Rod end bearings that have high friction can cause instability and ultimately require servicing.
Levers and linkage should be sturdy yet low in mass tor the fastest speed of response.