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The reading should rise slowly and then display “overload” or “out of range” after a few seconds. If it does not, consider this a short circuit. Next, switch the meter leads so that the positive lead is on terminal E12 and the negative lead is on terminal E13. The display should read between 0.3 and 0.8 volts. If it reads lower, consider this a short circuit. If the readings are not correct, verify that the correct wires are connected to the screw terminals by verifying the labels “E12” and “E13” on the wires. 14. Disconnect BCT and Re-check the DPC DC Bus If you have reached this step according to the trouble- shooting flowchart you have verified that there is a short circuit measured on the DC Bus in the DPC. Now it is necessary to isolate where the short has occurred (DPC, BCT or RFC). Locate the terminals E4 and E5 at the top of the DPC Power Board. Loosen the screws until the wires can be disconnected from the DPC Power Board. Note: Be careful not to unscrew them completely as they are not meant to be removed! Doing so will damage the threads of the screw. Disconnect the wires making sure that they are isolated from the DPC and repeat the measurements in Step #11. 15. Disconnect RFC and Re-check the DPC DC Bus If you have reached this step according to the trouble- shooting flowchart you have verified that there is a short circuit measured on the DC Bus in the DPC. Now it is necessary to isolate where the short has occurred (DPC or RFC). Locate the terminals E12 and E13 at the top of the DPC Power Board. Loosen the screws until the wires can be disconnected from the DPC Power Board. Note: Be careful not to unscrew them completely as they are not designed to be removed! Doing so will damage the threads of the screw. Disconnect the wires making sure that they are isolated from the DPC and repeat the measurements in step 11. 16. Check Inverter IGBTs for Short Circuits In Step #9A the inverter IGBTs were measured for short circuits to ground. In this section you will measure each individual IGBT (there are six for the line inverter and six for the generator inverter) for internal short or open circuits. First, locate the inverter IGBT screw terminals. They are to the right of the vent fan labeled 20, 21, 22, 23 and 24 and are distinguished by the gold colored screws. Terminals 23 and 24 are connected to the DC Bus+ and DC Bus- respectively. Set the Digital Multimeter to the “diode” setting. Place the positive lead of the meter on terminal 24 (Bus-) and the negative lead on terminal 20. It should read between 0.2 and 0.5. If it is outside this range, the IGBT is damaged. Repeat the above procedure moving the negative lead to terminal 21 and then 22. Place the negative lead of the meter on terminal 23 (Bus+) and repeat the above measurements using the positive lead of the meter to connect to terminals 20, 21 and 22. The result should fall into the same range as above. 17. Check Generator IGBTs for Short Circuits In Step #10A the generator IGBTs were measured for short circuits to ground. In this section you will measure each individual IGBT (there are six for the line inverter and six for the generator inverter) for internal short or open circuits. First, locate the generator IGBT screw terminals. They are to the left of the vent fan labeled 20, 21, 22, 23 and 24 and are distinguished by the gold colored screws. Terminals 23 and 24 are connected to the DC Bus+ and DC Bus- respectively. Set the Digital Multimeter to the “diode” setting. Place the positive lead of the meter on terminal 24 (Bus-) and the negative lead on terminal 20. It should read between 0.2 and 0.5. If it is outside this range, the IGBT is damaged. Repeat the above procedure moving the negative lead to terminal 21 and then 22. Place the negative lead of the meter on terminal 23 (Bus+) and repeat the above measurements using the positive lead of the meter to connect to terminals 20, 21 and 22. The result should fall into the same range as above. Observe Safety Precautions - Refer to Important Safety Instructions for Details 430001-001 Rev A (Apr 2002) 5 Troubleshooting Guide Capstone Turbine Corporation reserves the right to change or modify without notice the design, the equipment 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 | CAPSTONE MICROTURBINE MODEL 330 TROUBLESHOOTING GUIDE
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