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5. DC Bus Measurements a. Set the Digital Multimeter to measure diodes and check as follows: i. Set Meter+ to DC bus–, and Meter- to DC bus+. It should read like a diode (>0.3 Volt). ii. Set Meter+ to DC bus+, and Meter- to DC bus-. It should read higher than 3 Volts and then like an open circuit. b. Set the Digital Multimeter to measure resistance and check as follows: i. Measure resistance from DC bus+ to Chassis. It should read in Mega ohms. ii. Measure resistance from DC bus- to Chassis. It should read in Mega ohms. 6. IGBT Test a. Set the Digital Multimeter to measure diodes. Disconnect the A, B, C, and N wires from the LCM inductors. For each phase, measure DC+ and DC- to AC output correspondingly. You should get four measurements for each phase as follows: i. For A phase - Measure from the A IGBT to inductors: • Set Meter+ to DC- A phase IGBT, and Meter– to A inductor. It should read like a diode (0.3 V). • Set Meter– to DC+ A phase IGBT, and Meter+ to A inductor. It should read like a diode (0.3 V). • Set Meter+ to DC+ A phase IGBT, and Meter– to A inductor. It should read over 3 volts and then like an open circuit. • Set Meter- to DC- A phase IGBT, and Meter+ to A inductor. It should read over 3 volts and then like an open circuit. ii. For B phase - Measure from the B IGBT to inductors: • Set Meter+ to DC- B phase IGBT, and Meter– to B inductor. It should read like a diode (0.3 V). • Set Meter– to DC+ B phase IGBT, and Meter+ to B inductor. It should read like a diode (0.3 V). • Set Meter+ to DC+ B phase IGBT, and Meter– to B inductor. It should read over 3 volts and then like an open circuit. • Set Meter- to DC- B phase IGBT, and Meter+ to B inductor. It should read over 3 volts and then like an open circuit. iii. For C phase - Measure from the C IGBT to inductors: • Set Meter+ to DC- C phase IGBT, and Meter– to C inductor. It should read like a diode (0.3 V). • Set Meter– to DC+ C phase IGBT, and Meter+ to C inductor. It should read like a diode (0.3 V). • Set Meter+ to DC+ C phase IGBT, and Meter– to C inductor. It should read over 3 volts and then like an open circuit. • Set Meter- to DC- C phase IGBT, and Meter+ to C inductor. It should read over 3 volts and then like an open circuit. iv. For Neutral - Measure from the N IGBT to inductors: • Set Meter+ to DC- N IGBT, and Meter– to N inductor. It should read like a diode (0.3 V). • Set Meter– to DC+ N IGBT, and Meter+ to N inductor. It should read like a diode (0.3 V). • Set Meter+ to DC+ N IGBT, and Meter– to N inductor. It should read over 3 volts and then like an open circuit. • Set Meter- to DC- N IGBT, and Meter+ to N inductor. It should read over 3 volts and then like an open circuit. Observe Safety Precautions - Refer to Safety Instructions for Details 430013-001 Rev C (July 2003) 1-8 Model C60 Troubleshooting Guide This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Table of Contents for Series Fault Codes
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