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Essential details：8241-956 2301 Electric Controls
The 2301 electric governor is one in which its actuator output (terminal) shaft position is directly proportional to the input signal from its electric control unit. It can be used in an isochronous (constant speed) mode for single engine operation or when paralleled with similar units on an isolated bus. It can also be used in the droop mode for paralleling dissimilar units or operating on an infinite bus. The 2301 governor is used in the same type of service as many other governor models. It is particularly well suited, when used with some types of proportional actuators, to engines operated in tandem to drive a common load. In such installations, one electric control is used to furnish the same input signal to the proportional actuator on each engine. Since each actuator receives the same current, their output shafts take the same position and give each engine the same amount of fuel.
The 2301 electric governor consists of an electric control unit, a speed setting potentiometer, and a hydraulic actuator. The electric control receives the input signals to the governor; its output serves as the input signal to the actuator. The actuator output controls the flow of energy medium to the prime mover. The speed setting potentiometer, used to adjust speed setting, provides one of the inputs to the electric control.
The operation of the 2301 type governor is different and distinct from other electric governors. The steady-state output of the electric control is a level of voltage determined by the actuator terminal shaft position required to maintain a particular load on the prime mover. The voltage is always the same polarity. This type of control unit requires an actuator in which the output shaft takes a position proportional to the voltage of the input signal.
In contrast, the electric control unit of the EG series electric governor emits a nominally zero signal during conditions of on-speed, steady-state operation, and larger voltage signal only during off-speed or load-changing periods. In this type of system, the direction of actuator operation depends on signal polarity.
As is the case with any type governor, the prime mover should be equipped with a separate overspeed device to prevent runaway if a failure should render the governor inoperative.
8241-956
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8241-956 2301 Electric Controls
This is a proportional actuator that has a mechanical-hydraulic backup governor section as well as an electric-signal-operated governor section. It must be driven directly from the prime mover for speed sense to the flyweights and operation of the governor oil pressure pump. The EGB-2P actuator has a stalled work capacity of 2.5 ft-lb (3.4 J) at a 32° output shaft travel. Useful work capacity is about 2/3 of stalled capacity
This actuator has no mechanical-hydraulic backup governor. Some models require a drive for an internal oil pump, but the rotation need not be proportional to prime mover speed. These models can be mounted external to the prime mover and driven by an electric motor or other device if no drive pad has been furnished on the prime mover. Other models have an oil motor built into the actuator. These units require pressure oil from an external source to operate the oil motor and provide the working pressure needed by the actuator.
The EG-3P has 4.5 ft-lb (6.1 J) of stalled work capacity, a useful work capacity of 3 ft-lb (4 J), and a maximum 42° output shaft travel. Torque rating is 6.0 lb-ft (8.1 Nm).
The simplest of the proportional actuators, the 2301 actuator does not require a drive of any kind, since there is no flyweight backup governor or pressure pump contained in it. Hydraulic pressure fluid must be supplied from an external source, such as the prime mover’s fuel oil or lubricating oil supply. Accepting fluid pressures within a 15–100 psi (103–690 kPa) range, the 2301 actuator will supply 0.166 ft-lb (0.225 J) of stalled work capacity for each 10 psi (69 kPa) hydraulic pressure input (useful work is about 2/3 of stalled capacity), through an angular output shaft travel of 30°. Torque is 0.32 lb-ft (0.43 Nm) per each 10 psi (69 kPa) input.
In applications involving unattended cold starting, an EG-type actuator is recommended unless fuel oil with its low viscosity is available as the pressure source for the 2301 actuator. Most lubricating oils are suitable for controlling the 2301 actuator when oil is at operating temperature. Viscosity of hydraulic fluid above 1000 SUS during cold start will temporarily cause the actuator to operate erratically.
This manual describes the EG-3P actuator, which may be used with any of the 2301 electric controls. Other manuals describe the other actuators and the electric controls available to operate proportional actuators.
