Introduction

This manual describes the 723PLUS Generator Control, P/N’s 8280-3011/12 (High & Low Voltage Control)

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 MW 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 MW 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 4–20 mA MW Transducer input, or the actuator position. 

Isochronous load sharing with soft loading/unloading and automatic generator breaker open command once the engine has unloaded.

MW control with soft loading/unloading and automatic generator breaker open command once the engine has unloaded. The reference may be adjusted locally (Increase/Decrease contacts) or remotely (analogue reference: 4–20 mA or Modbus® ).

Start and maximum fuel limiters are provided. 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.

One LON connection of the 723PLUS may be connected to a DSLC, so that all of the generator parameters may be monitored within the 723PLUS, and then also via the Modbus.

One serial port (J3) is available for Modbus communications using RS-232,   RS-422 or RS-485. Engine and generator parameters can be monitored and certain control functions sent to the control via the Modbus.

4–20 mA outputs are available for monitoring various control parameters.

723PLUS Digital Control Accessories

Hand Held Programmer (Figure 1-2), part number 9907-205, is used for adjusting the 723 Plus 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 (MW Transducer) for generator load monitoring   (P/N 8272-394).

Woodward 723 PLUS Digital Control 8280-1001 9906-619 SPM-D1145b/LSR/SPMD1145BLSR

Woodward 723 plus Digitale Controllo 8280-1001 9906-619

Woodward 723 Plus digital controller 8280-1001 9906-619

Woodward 723 Plus Contrle Numrique 8280-1001 9906-619

Woodward 723 Plus control number 8280-1001 9906-619 5464-544 4