ESD5500E Series Speed Control Unit

• Simple Installation and Adjustability
• Environmentally Friendly
• Adjustable Droop and Idle Circuits
• Accessory Inputs for Load Sharing
• Variable Speed Operation
• Reverse Battery Voltage Protected
INTRODUCTION
The ESD5500E Series speed control unit is 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, 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.
Simplicity of installation and adjustment was foremost in the
design. Non interacting performance controls allow near optimum
response to be easily obtained.
The primary features of the ESD5500E Series speed control
unit are the engine STARTING FUEL and SPEED RAMPING
adjustments. The use of these features will minimize
engine exhaust smoke experienced prior to attaining engine
operating speed.
Other features include adjustable droop and idle operation,
inputs for accessories used in multi engine or special applications,
protection against reverse battery voltage, transient
voltages, accidental short circuit of the actuator and fail safe
design in the event of loss of speed sensor signal or battery
supply.
The ESD5500E Series speed control unit is compatible with
all GAC proportional actuators except the ACB2000 electric
actuator. When the ESD5500E Series speed control unit is
used with a ADC100 Series electric actuator, the DROOP
adjustment range will be less due to this actuator’s low current
demand.
DESCRIPTION
Engine speed information for the speed control unit is usually
received from a magnetic speed sensor. Any other signal
generating device may be used provided the generated
frequency is proportional to engine speed and meets the
voltage input and frequency range specification. The speed
sensor is typically mounted in close proximity to an engine
driven ferrous gear, usually the engine ring gear. As the teeth
of the gear pass the magnetic sensor, a signal is generated
which is proportional to engine speed.
Signal strength must be within the range of the input ampli-
fier. An amplitude of 0.5 to 120 volts RMS is required to allow
the unit to function within its design specifications. The
speed signal is applied to Terminals C and D of the speed
control unit. Between these terminals there is an input impedance
of over 33,000 ohms. Terminal D is internally connected
to Terminal E, battery negative. Only one end of the
shielded cable should be connected.
When a speed sensor signal is received by the controller,
the signal is amplified and shaped by an internal circuit to
provide an analog speed signal. If the speed sensor monitor
does not detect a speed sensor signal, the output circuit of
the speed control unit will turn off all current to the actuator.
A summing circuit receives the speed sensor signal along
with the speed adjust set point input. The speed range has a
ratio of 8:1 and is adjusted with a 25 turn potentiometer. The
output from the summing circuit is the input to the dynamic
control section of the speed control unit. The dynamic control
circuit, of which the gain and stability adjustments are
part, has a control function that will provide isochronous and
stable performance for most engine types and fuel systems.
The speed control unit circuit is influenced by the gain and
stability performance adjustments. The governor system
sensitivity is increased with clockwise rotation of the gain
adjustment. The gain adjustment has a range of 33:1. The
stability adjustment, when advanced clockwise, increases
the time rate of response of the governor system to match
the various time constants of a wide variety of engines. The
speed control unit is a P I D device, the “D”, derivative portion
can be varied when required.

ESD 5200 Series Speed Control Unit

• Selectable Droop Operation
• Adjustable Idle Current
• Precision Speed Control
• Inputs for Accessories
• Reverse Voltage Protection
• Single Element Speed Switch
• Speed Anticipation Circuit
• Overspeed LED Indication
INTRODUCTION
The ESD5200 Series speed control unit is 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, 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.
Simplicity of installation and adjustment was foremost in the
design. Non interacting performance controls allow near optimum
response to be easily obtained.
Other features include; adjustable droop and idle operation,
inputs for accessories used in multi engine or special applications,
a single element speed switch, protection against
reverse battery voltage, transient voltages, accidental short
circuit of the actuator and fail safe design in the event of loss
of speed sensor signal or battery supply.
DESCRIPTION
Engine speed information for the speed control unit is usually
received from a magnetic speed sensor. Any other signal
generating device may be used provided the generated
frequency is proportional to engine speed and meets the
voltage input and frequency range specification. The speed
sensor is typically mounted in close proximity to an engine
driven ferrous gear, usually the engine ring gear. As the teeth
of the gear pass the magnetic sensor, a signal is generated
which is proportional to engine speed.
Signal strength must be within the range of the input ampli-
fier. An amplitude of 0.5 to 120 volts RMS is required to allow
the unit to function within its design specifications. The
speed signal is applied to Terminals C and D of the speed
control unit. Between these terminals there is an input impedance
of over 33,000 ohms. Terminal D is internally connected
to Terminal E, battery negative. Only one end of the
cable shield should be connected.
When a speed sensor signal is received by the controller,
the signal is amplified and shaped by an internal circuit to
provide an analog speed signal. If the speed sensor monitor
does not detect a speed sensor signal, the output circuit of
the speed control unit will turn off all current to the actuator.
A summing circuit receives the speed sensor signal along
with the speed adjust set point input. The speed range has
a ratio of 8:1 and is adjusted with an internal 25 turn potentiometer.
The output from the summing circuit is the input to
the dynamic control section of the speed control unit. The
dynamic control circuit, of which the gain and stability adjustments
are part, has a control function that will provide
isochronous and stable performance for most engine types
and fuel systems.
The speed control unit output circuit is influenced by the gain
and stability performance adjustments. The governor system
sensitivity is increased with clockwise rotation of the gain
adjustment. The gain adjustment has a range of 33:1. The
stability adjustment, when advanced clockwise, increases
the time rate of response of the governor system to match
the various time constants of a wide variety of engines. The
speed control unit is a P I D device, the “D”, derivative portion
is fixed but can be easily varied, when required (See
Instability section).
During engine cranking, the actuator becomes fully energized
and moves to the maximum fuel position. The actuator
will remain in that state during engine cranking and acceleration.
While the engine is at steady load, the actuator will
be energized with sufficient current to maintain the governor
speed set point.

GAC ESD 5100 Series Speed Control Unit

• Simple Installation and Adjustment
• Isochronous, Droop, & Variable Speed Operation
• Adjustable PID
• Idle Speed Circuit
• Auxiliary Accessory Input
• 10 Amp Drive Circuit
• Inputs for Accessories
INTRODUCTION
The ESD5100 Series electronic speed device is 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, 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.
Simplicity of installation and adjustment was foremost in the
design. Non-interacting performance controls allow near optimum
response to be easily obtained.
Other features include adjustable droop and idle operation,
inputs for accessories used in multi-engine or special applications,
protection against reverse battery voltage, transient
voltages, accidental short circuit of the actuator and fail safe
design in the event of loss of speed sensor signal or battery
supply.
DESCRIPTION
Engine speed information for the speed control unit is usually
received from a magnetic speed sensor. Any other signal-
generating device may be used provided that the generated
frequency is proportional to engine speed and meets
the voltage input and frequency range specification. The
speed sensor is typically mounted in close proximity to an
engine driven ferrous gear, usually the engine ring gear. As
the teeth of the gear pass the magnetic sensor, a signal is
generated which is proportional to engine speed.
Signal strength must be within the range of the input ampli-
fier. An amplitude of 0.5 to 50 volts RMS is required to allow
the unit to function within its design specifications. The
speed signal is applied to Terminals C and D on the ESD’s.
Between these terminals there is an input impedance of over
33,000 Ω. Terminal D is internally connected to Terminal E,
battery negative. Only one end of the cable shield should be
connected.
When a speed sensor signal is received by the ESD, the signal
is amplified and shaped by an internal circuit to provide
an analog speed signal. If the speed sensor monitor does
not detect a speed sensor signal, the output circuit on the
ESD will turn off all current to the actuator.
A summing circuit receives the speed sensor signal along
with the speed adjust set point input. The speed range has
a ratio of 9:1 and is adjusted with by the 25-turn SPEED potentiometer.
The output from the summing circuit is the input
to the dynamic control section of the speed control unit. The
dynamic control circuit, of which the GAIN and STABILITY
adjustments are part of, has a control function that will provide
isochronous and stable performance for most engine
types and fuel systems.
The ESD’s circuit is influenced by the GAIN and STABILITY
performance adjustments. The governor system sensitivity
is increased with clockwise relation of the GAIN adjustment.
The GAIN adjustment has a range of 33:1. The STABILITY
adjustment, when advanced clockwise, increases the time
rate of response of the governor system to match the various
time constants of a wide variety of engines. The ESD is
a PID device, the “D”, derivative portion can be varied when
required. (See instability section in PIB1000.)
During the engine cranking cycle, the actuator becomes fully
energized and moves to the maximum fuel position. The actuator
will remain in this state during engine cranking and
acceleration. While the engine is at steady load, the actuator
will be energized with sufficient current to maintain the governor
speed set point.
The output circuit provides switching current at a frequency
of about 500 Hz. to drive the actuator. Since the switching
frequency is well beyond the natural frequency of the actuator,
there is no visible motion of the actuator output shaft.