Manual 85018V1
505E Digital Governor
Woodward
iii
Illustrations and Tables
Figure 1-1a. Overview of 505E Functionality (Notes) ............................................ 5
Figure 1-1b. Overview of 505E Functionality ......................................................... 6
Figure 1-1c. Overview of 505E Functionality .......................................................... 7
Figure 1-2. Typical Extraction and/or Admission Steam Turbine ........................... 9
Figure 1-3. Typical Admission Steam Turbine ..................................................... 10
Figure 1-4. Overview with Auxiliary Configured as a Limiter ................................ 17
Figure 1-5. Overview with Auxiliary Configured as a Controller ........................... 18
Figure 1-6. Overview with Decoupled HP & LP Ratio/Limiter, Auxiliary Configured
as a Limiter ...................................................................................... 19
Figure 1-7. Overview with Decoupled HP & LP Ratio/Limiter, Auxiliary Configured
as a Controller ................................................................................. 20
Figure 1-8. 505E Key Pad and Display ................................................................ 21
Figure 2-1. 505E Control Layout (Standard Enclosure) ....................................... 26
Figure 2-2. 505E Bulkhead-Mounted Enclosure .................................................. 27
Figure 2-3. Jumper Options .................................................................................. 28
Figure 2-4. Jumper Locations ............................................................................... 28
Figure 2-5. CageClamp Terminal Blocks ............................................................. 30
Figure 2-6. Control Wiring Diagram ...................................................................... 31
Figure 2-7. Representative 505E I/O Schematic .................................................. 32
Figure 2-8. Fuse Location ..................................................................................... 33
Figure 2-9. Shielded Wire Connections ................................................................ 34
Figure 2-10. Typical RS-232 Communications..................................................... 39
Figure 2-11. Typical RS-422 Communications..................................................... 39
Figure 2-12. Typical RS-485 Communications..................................................... 40
Figure 2-13a. Preferred Multipoint Wiring ............................................................ 41
Figure 2-13b. Alternate Multipoint Wiring ............................................................. 41
Figure 3-1. Basic Control Overview ...................................................................... 42
Figure 3-2. Coupled HP & LP Mode ..................................................................... 46
Figure 3-3. Decoupled Inlet (HP) Mode ................................................................ 47
Figure 3-4. Decoupled Exhaust (LP) Mode .......................................................... 48
Figure 3-5. Decoupled HP & LP Mode ................................................................. 49
Figure 3-6. Priority Flow Diagram ......................................................................... 50
Figure 3-7. Manual Start Mode Example .............................................................. 53
Figure 3-8. Semiautomatic Start Mode Example.................................................. 54
Figure 3-9. Automatic Start Mode ........................................................................ 55
Figure 3-10. Idle / Rated Start .............................................................................. 57
Figure 3-11. Automatic Start Sequence ............................................................... 58
Figure 3-12. Speed Control Functional Diagram .................................................. 61
Figure 3-13. Speed PID Control Modes ............................................................... 62
Figure 3-14. Frequency and Unit Load Relationship ............................................ 64
Figure 3-15. Speed Relationships ........................................................................ 65
Figure 3-16. Loadsharing Logic ............................................................................ 72
Figure 3-17. Extr/Adm Control Diagram ............................................................... 74
Figure 3-18. Cascade Functional Diagram ........................................................... 82
Figure 3-19. Aux Control Overview ...................................................................... 87
Figure 4-1. Basic Program Architecture ............................................................. 101
Figure 4-2. Initial 505E Program Mode Entry ..................................................... 102
Figure 4-3a. Program Mode Blocks .................................................................... 104
Figure 4-3b. Program Mode Blocks .................................................................... 105
Figure 4-3c. Program Mode Blocks .................................................................... 106
Figure 4-3d. Program Mode Blocks .................................................................... 107
Figure 4-3e. Program Mode Blocks .................................................................... 108
Figure 4-3f. Program Mode Blocks ..................................................................... 109