P/N’s 8280-153, 8280-154
8280-317, 8280-318
8280-322, 8280-323
General Information
Introduction
This manual describes the 723 Generator Control, p/n’s 8280-153/154 (High & Low Voltage
Control without GUI), 8280-317/318 (High & Low Voltage Control with GUI), 8280
322/323 (Low Voltage Marine Control with and without GUI).
Application
The control is intended for use in a variety of generator applications; for auxiliary generators
and diesel electric propulsion in the marine market, and for island mode systems and for base
loading against an infinite bus in the Power Plant market.
The KW Control mode is especially useful for applications where the grid is weak and large
frequency excursions are expected. Under these circumstances, operating in droop mode is
not practical, as large variations in load would be experienced, due to frequency shifts of the
grid. In kW control, the speed of the engine is maintained by the grid, and the load on the
generator remains constant throughout the frequency excursion.
The control provides closed loop speed control, with a torsional filter and a notch (band-stop)
filter to help to eliminate the problems caused by low frequency oscillations due to engine &
generator inertias and flexible couplings.
Three modes of operation are available:
• Droop control based on a 4-20mA KW Transducer input, or the actuator position.
• Isochronous load sharing with soft loading/unloading, and automatic generator breaker
open command once the engine has unloaded.
• KW control with soft loading/unloading, and automatic generator breaker open
command once the engine has unloaded. The reference may be adjusted by
Increase/Decrease contacts or by analogue reference - 4-20mA or Modbus®. In addition
an internally tunable kW reference value can be used.
Start and maximum fuel limiters are provided, as well as a charge air pressure limiter based on
the 4-20mA Charge Air Pressure input (not available with all part numbers). A load limiter,
enabled during KW control, will provide load de-rating during frequency excursions.
Additional protection is offered to open the Grid Breaker or the Generator Breaker, should
the frequency excursion become too large.
The control can be adjusted/biased for synchronising the generator to the bus by means of the
Increase/Decrease contacts, or by the input provided for a Woodward Unit Synchroniser
(SPM-A or DSLC - Digital Synchroniser & Load Control). The control may also be used for
synchronising to the grid using the second synchroniser input (System Synchroniser), for an
SPM-A or DSLC (not available with all part numbers).
General Information
One LON connection of the 723 may be connected to a DSLC, so that all of the generator
parameters may be monitored within the 723, and then also via the Modbus®.
One serial port (J3) is available for Modbus® communications using RS232, RS422 or
RS485. Engine and generator parameters can be monitored, and certain control functions sent
to the control via the Modbus®.
4-20mA outputs are available for monitoring various control parameters.
723 Digital Control
Declaration of Incorporation
In accordance with the EMC directive 89/336/EEC and its amendments, this controlling
device, manufactured by the Woodward Governor Company, is applied solely as a
component to be incorporated into an engine prime mover system. Woodward Governor
declares that this controlling device complies with the requirements of EN50081-2 and
EN50082-2 when put into service per the installation and operating instructions outlined in
the product manual.
NOTICE:
This controlling device is intended to be put into service only upon
incorporation into an engine prime mover system that itself has met the requirements of the
above Directive and bears the CE mark.
723 Digital Speed Control Accessories
Hand Held Programmer (Figure 2-2), part number 9907-205, is used for adjusting the 723
control setpoints/parameters. It plugs into the serial port of the control.
Digital Synchroniser & Load Control (DSLC) for synchronising the generator phase &
voltage to that of the power bus. The DSLC also provides dead bus closure facility and has
real power load sensing using harmonic filtering algorithms. (DSLC manual 02007).
SPM-A Synchroniser (9907-028 (without voltage matching) & 9907-029 (with voltage
matching)) for synchronising the generator phase to that of the power bus. The synchroniser
generates a generator breaker closure command to connect the unit in with the power bus.
Real Power Sensor (kW Transducer) for generator load monitoring. (p/n 8272-394)
723 Control Specifications
Part Numbers:
8280-153 High Voltage Control without GUI (Graphical User Interface)
8280-154 Low Voltage Control without GUI
8280-317 High Voltage Control with GUI
8280-318 Low Voltage Control with GUI
8280-322 Low Voltage Marine Control without GUI
8280-323 Low Voltage Marine Control with GUI
9907-205 Hand Held Programmer
