Related Manuals for Woodward 8272-781
Summary of Contents for Woodward 8272-781
- Page 1 Product Manual 82052 (Revision C) Original Instructions Real Power Sensor 8272-781, 8272-796, & 8272-826 Installation and Operation Manual...
- Page 2 Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly undertaken.
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Page 3: Table Of Contents
Illustrations and Tables Figure 1-1. Real Power Sensor (8272-781 & 8272-826) ........2 Figure 2-1. Real Power Sensor Block Diagram (8272-781 and 8272-826) ... 6 Figure 2-2. Real Power Sensor Block Diagram (8272-796) ........7 Figure 3-1. Real Power Sensor Outline Drawing ........... 9 ... -
Page 4: Warnings And Notices
Start-up On- and off-highway Mobile Applications: Unless Woodward's control functions as the supervisory control, customer should install a system totally independent of the prime mover control system that... -
Page 5: Electrostatic Discharge Awareness
Do not touch the components or conductors on a printed circuit board with your hands or with conductive devices. To prevent damage to electronic components caused by improper handling, read and observe the precautions in Woodward manual 82715 , Guide for Handling and Protection of Electronic Controls, Printed Circuit Boards, and Modules. - Page 6 Real Power Sensor Manual 82052 Woodward...
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Page 7: Chapter 1. General Information
Real Power Sensor Chapter 1. General Information The 8272-781, 8272-796, and 8272-826 Real Power Sensors (see Figure 1-1) are used with Woodward DCS Control Systems whenever a current signal is needed that is proportional to load. The Real Power Sensor uses three-phase CT and PT inputs from a balanced power bus to calculate the real component of power on the bus. -
Page 8: Figure 1-1. Real Power Sensor (8272-781 & 8272-826)
= rms line current in series with one current transformer secondary connections (in amps) = ratio of current transformer Θ = angle between phase voltage and phase current (in degrees) (or Cos Θ = Power Factor) Figure 1-1. Real Power Sensor (8272-781 & 8272-826) Woodward... -
Page 9: Chapter 2. Theory Of Operation
The resulting signal is proportional to current amplitude and phase relation of voltage input and current. The 8272-781 and 8272-796 Real Power Sensors require CTs that are sized to provide a 5 A secondary current at maximum generator output. The 8272-826 Real Power Sensor requires a 1 A secondary current at maximum generator output. -
Page 10: Power Sensing Circuit
Droop/Isochronous Operation On models 8272-781 and 8272-826, the Real Power Sensor is set for isochronous operation when 20–45 Vdc is applied at Terminals 27(+) and 28(–); the Droop potentiometer is shorted, and the load-sharing lines are connected internally to the load-share bridge. -
Page 11: Synchronizer Circuit (8272-781 And 8272-826)
Real Power Sensor Synchronizer Circuit (8272-781 and 8272-826) On models 8272-781 and 8272-826 only, the synchronizer circuit receives input from the SPM (speed and phase matching) synchronizer. This signal indicates whether to increase or decrease speed to match the frequency and phase of this generator with either the utility bus or another generator in use. -
Page 12: Figure 2-1. Real Power Sensor Block Diagram (8272-781 And 8272-826)
Real Power Sensor Manual 82052 Figure 2-1. Real Power Sensor Block Diagram (8272-781 and 8272-826) Woodward... -
Page 13: Figure 2-2. Real Power Sensor Block Diagram (8272-796)
Manual 82052 Real Power Sensor Figure 2-2. Real Power Sensor Block Diagram (8272-796) Woodward... -
Page 14: Chapter 3. Installation
Do not connect the cable shields to any external grounds. The cable shield is grounded at the power-sensor end only. Make sure that cable shields are connected through all intermediate terminal blocks from the signal source to the signal termination (do not leave any floating grounds). Woodward... -
Page 15: Figure 3-1. Real Power Sensor Outline Drawing
Manual 82052 Real Power Sensor Figure 3-1. Real Power Sensor Outline Drawing Woodward... -
Page 16: Figure 3-2. Plant Wiring Diagram (8272-781 And 8272-826)
Real Power Sensor Manual 82052 Figure 3-2. Plant Wiring Diagram (8272-781 and 8272-826) Woodward... -
Page 17: Figure 3-3. Plant Wiring Diagram (8272-796)
Manual 82052 Real Power Sensor Figure 3-3. Plant Wiring Diagram (8272-796) Woodward... -
Page 18: Chapter 4. Calibration Procedure
Read, then follow these instructions when checking or calibrating the real power sensor. HIGH VOLTAGE—High voltage is present at the conductors and on the circuit board of the real power sensor. Death or injury may result from contacting these areas. Use care while working around the unit. Woodward... -
Page 19: Operational Test
The values presented in the following calibrations procedures are values used by Woodward for the calibration of a new unit. Before recalibrating your unit, check with Woodward for any changes in the equipment that will change these values. If changes have been made, mark the changes in this manual. - Page 20 Remove the short of the C phase CT. 15. Compare your recorded values from steps 9, 11, and 13. These values should be the same (±10%). If they are not, recheck for crossed phases (CTs not matched to PTs). Recheck for phasing, and correct any problems. Woodward...
- Page 21 This completes the operational test for model 8272-796. If your model is 8272-781 or 8272-826, continue below. Steps 20 through 26 apply to load sharing model 8272-781 and 8272- 826 only. 20. Operating in isochronous mode and with no load, note the operating speed of the generator *__________ rpm or (Hz).
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Page 22: Chapter 5. Product Support And Service Options
A current list of Woodward Business Partners is available at www.woodward.com/directory. Product Service Options Depending on the type of product, the following options for servicing Woodward products may be available through your local Full-Service Distributor or the OEM or Packager of the equipment system. -
Page 23: Returning Equipment For Repair
To prevent damage to electronic components caused by improper handling, read and observe the precautions in Woodward manual 82715, Guide for Handling and Protection of Electronic Controls, Printed Circuit Boards, and Modules. -
Page 24: Engineering Services
Field Service engineering on-site support is available, depending on the product and location, from one of our Full-Service Distributors. The field engineers are experienced both on Woodward products as well as on much of the non- Woodward equipment with which our products interface. -
Page 25: Technical Assistance
Real Power Sensor Technical Assistance If you need to contact technical assistance, you will need to provide the following information. Please write it down here before contacting the Engine OEM, the Packager, a Woodward Business Partner, or the Woodward factory: General... - Page 26 Email and Website—www.woodward.com Woodward has company-owned plants, subsidiaries, and branches, as well as authorized distributors and other authorized service and sales facilities throughout the world. Complete address / phone / fax / email information for all locations is available on our website.
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