Varaible Speed Drives for Motor Driven Fire Pumps
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Variable speed fire pump controllers can use variable frequency drives (VFDs) to control pump speed. VFDs have several elements including rectifiers, DC links, and inverters. They provide soft starting for motors but can also affect motors and electrical systems. Proper motor requirements, testing, and system tuning are needed for fire pump applications.
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Varaible Speed Drives for Motor Driven Fire Pumps
- 1. Variable Speed Fire Pump Controllers - for - F.M. Approvals - by - James S. Nasby Columbia Engineering
- 3. Model ECV-250-46-* 250 Hp – Single Source A.T.L Start in Bypass
- 4. Model ECV-250-46-* 250 Hp – Single Source A.T.L Start in Bypass
- 6. Inside View of Drive Bay D.C. Link Reactor Line Reactor Cooler CPT & Fuses
- 12. System Response Curves Under Damped Oscillatory (With Overshoot) Over Damped Critically Damped
- 15. Power Circuit Schematic * Was Optional
- 16. VFD OCP Fuses and view of VFD Sans Cover
- 17. Schematic Diagram Single Source A.T.L. (D.O.L.) Starting in Bypass Mode Low to Moderate Horsepower Note Mechanical Interlock (Mech Intk) Between R1 and BP Contactors.
- 18. Line Reactor and 2nd Cooler
- 19. Two Coolers for 300 Hp VFD Note: this unit sees regular service a pump company pump test facility.
- 21. Close-up of Pressure Switch and Both Pressure Transducers
- 25. VFD = Motor Running Only (No Motor Starting Region) Typical Motor Torque and Pump Torque Curves
- 26. Lower Frequency Shortens Curve This point Moves Left Relative to Frequency 100% = 60 Hz or 59 or 30 or any Frequency
- 27. 3 Phase Line Freq. AC / DC Smoothing DC / AC At “X” Khz VFD – Principles of Operation Modulation Frequeny Typically 2 to 10 Khz
- 28. PWM Basic VFD Voltage Waveform Pulse Mode Modulation at 2.0 to 10.0 Khertz 2 Khz One Cycle
- 29. PWM Motor Voltage Waveform with No Filtering
- 30. PWM Motor Voltage Waveform with Load (Motor) Reactor
- 31. PWM Motor Voltage Waveform with Motor Filter
- 32. Motor Electrical Measurements Special Metering Required due to the High Voltage and Frequency
- 44. … and Back-up Distant Water Supply…
- 45. Lead to Multiple System Time Constants Note 253 Second Chart Span
- 46. Note 151 Sec. Chart Span Lead to Multiple System Time Constants
- 47. Note 86 Sec. Chart Span Lead to Multiple System Time Constants
- 48. Note 63 Sec. Chart Span Lead to Multiple System Time Constants Estimated 25s, 20s, 4s, 2s & ?? Hydraulic Time Constants
- 49. Unit Testing Small Unit after High and Low Temp. Testing: Ta < 0 º C and Ta > 60 º C Thermocouple Switch Box on top of unit.
- 50. Unit Testing
- 51. Unit Testing - 350 Hp Unit
- 52. Unit Testing - 350 Hp Unit
- 53. Unit Testing - 350 Hp Unit
- 54. Unit Testing - 350 Hp Unit
- 55. Unit Testing - 350 Hp Unit
- 56. Questions?