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Summary of Contents for Woodward 8272-221
- Page 1 Installation and Operation Manual Digital Reference Unit 8272-221 Direct Acting, 0–6 V Output 8272-468 Inverse Acting, 6–0 V Output Manual 82343 (Revision B)
- Page 2 Revisions—Text changes are indicated by a black line alongside the text. Woodward Governor Company reserves the right to update any portion of this publication at any time. Information provided by Woodward Governor Company is believed to be correct and reliable. However, no responsibility is assumed by Woodward Governor Company unless otherwise expressly undertaken.
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Page 3: Table Of Contents
HAPTER ERVICE PTIONS Product Service Options..................15 Returning Equipment for Repair................16 Replacement Parts ....................17 How to Contact Woodward...................17 Engineering Services ...................18 Technical Assistance....................19 Illustrations and Tables Figure 1-1. Digital Reference Unit Outline Drawing ..........2 Figure 1-2. Digital Reference Unit Assembly Drawing...........3 Figure 2-1. -
Page 4: Electrostatic Discharge Awareness
PCB from the control cabinet, place it in the antistatic protective bag. CAUTION—ELECTROSTATIC DISCHARGE 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. Woodward... -
Page 5: Chapter 1. General Information
The overspeed shutdown device must be totally independent of the prime mover control system. An overtemperature or overpressure shutdown device may also be needed for safety, as appropriate. Woodward... -
Page 6: Figure 1-1. Digital Reference Unit Outline Drawing
Digital Reference Unit Manual 82343 Figure 1-1. Digital Reference Unit Outline Drawing Woodward... -
Page 7: Figure 1-2. Digital Reference Unit Assembly Drawing
Manual 82343 Digital Reference Unit Figure 1-2. Digital Reference Unit Assembly Drawing Woodward... -
Page 8: Chapter 2. Installation And Adjustment
15 and the system circuit common to terminal 16. For systems that require negative ramps, connect the system circuit common to terminal 15 and the system reference input to terminal 16. Woodward... -
Page 9: Recommended Test Equipment
MIN Limit Indication contacts at terminals 17 and 18 close. Maximum Output Limit Without disconnecting the MIN Output, issue a MAX Output Select command. Verify that the reference-output level does not change and that the REFERENCE MOVING indicator is not illuminated. Woodward... - Page 10 MOVING indicator turns off, the INTERMEDIATE OUTPUT LIMIT indicator turns on. Verify zero resistance between terminals 19 and 20. If the reference output of Output Select It is not at the desired level, adjust the Set Point 4 potentiometer (R4). Woodward...
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Page 11: Meter Output Signal Check
A SLOW ramp rate is automatically selected if no other rate command is issued. For a MEDIUM ramp rate both INST and FAST rates must be selected. Select each rate and set the ramp time desired by adjusting the corresponding potentiometer. Figure 2-1. Typical Plant Wiring Diagram Woodward... -
Page 12: Figure 2-2. Block Diagram
Digital Reference Unit Manual 82343 Figure 2-2. Block Diagram Woodward... -
Page 13: Chapter 3. Principles Of Operation
DAC circuit. Change Detector Circuit The Change Detector circuit uses the digital codes from the Priority Encoder to control if the reference selection is changed. When a change is detected, the circuit sends a signal to the Run Control circuit. Woodward... -
Page 14: Operation
PCB A2. See Figure 2-2 for switch locations. The switches are accessible by removing the cover of the control. The potentiometers for adjusting the levels of the reference set points are accessible through the front cover. Woodward... - Page 15 Medium Ramp Rate Fast Ramp Rate Output Adjustments Top Board (A1) (Adjustment does not require removal of the control cover) Set Point 1 Set Point 2 Set Point 3 Set Point 4 Meter Offset Meter Range Max Limit Min Limit Woodward...
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Page 16: Function Indicators
Positive Ramp—Connect the Reference output to terminals 15 (+) and 16 (–). Negative Ramp—Connect the Reference output to terminals 16 (+) and 15 (–). METER 0–1 mA or 4–20 mA Readout meter can be connected to terminals 13 (+) and 14 (–) Woodward... -
Page 17: Figure 3-1. Top Board Potentiometers, Switches, And Test Points
Manual 82343 Digital Reference Unit Figure 3-1. Top Board Potentiometers, Switches, and Test Points Figure 3-2. Bottom Board Potentiometers and Test Points Woodward... -
Page 18: Chapter 4. Troubleshooting
If the switching has no effect, or Board A2. With Slow selected; select Fast, the INST is not instant, return the then Slow, then Medium. The clock rate unit for repair. must change. Repeat the procedure for the Fast and Medium Adjustments. Woodward... -
Page 19: Chapter 5. Service Options
Product Service Options The following factory options are available for servicing Woodward equipment, based on the standard Woodward Product and Service Warranty (5-01-1205) that is in effect at the time the product is purchased from Woodward or the service is performed: •... -
Page 20: Returning Equipment For Repair
Returning Equipment for Repair If a control (or any part of an electronic control) is to be returned to Woodward for repair, please contact Woodward in advance to obtain a Return Authorization Number. When shipping the item(s), attach a tag with the following information: •... -
Page 21: Replacement Parts
To expedite the repair process, contact Woodward in advance to obtain a Return Authorization Number, and arrange for issue of a purchase order for the item(s) to be repaired. No work can be started until a purchase order is received. -
Page 22: Engineering Services
Digital Reference Unit Manual 82343 Engineering Services Woodward Industrial Controls Engineering Services offers the following after- sales support for Woodward products. For these services, you can contact us by telephone, by email, or through the Woodward website. • Technical Support •... -
Page 23: Technical Assistance
Type of Fuel (gas, gaseous, steam, etc) Rating Application Control/Governor Information Please list all Woodward governors, actuators, and electronic controls in your system: Woodward Part Number and Revision Letter Control Description or Governor Type Serial Number Woodward Part Number and Revision Letter... - Page 24 Phone +1 (970) 482-5811 • Fax +1 (970) 498-3058 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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