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10. Check Generator for Short Circuits The generator side of the DPC has only three inductors. These are located under the Control Board mounting plate. The inductors can be accessed for electrical measurements at screw terminals 20, 21, 22 of the generator IGBT. Set the Digital Multimeter to measure resistance. Measure the resistance of each of these three screw terminals to chassis ground. The resistance of each phase should be over 5 kOhms. If it is less, consider this a short circuit. 10a) Check Generator IGBTs for Short Circuits For this step it is necessary to remove the Control Board and its mounting plate. First, disconnect all cables connected to the Control Board. Remove the four screws that hold the mounting plate to the DPC chassis. After this is done, the screw terminals E1, E2 and E3 of the Power Board should be visible. Remove each of the three screws from screw terminals E1, E2 and E3. Make sure that the inductor terminals are not touching the Power Board (inserting a piece of insulating material between them, such as paper, will help.). Measure the resistance of each terminal E1, E2 and E3 to chassis ground. The resistance should be above 5 kOhms. If it is less, consider this a short circuit. 10b) Check Generator Inductors for Short Circuits With the inductors still isolated from the Power Board, measure the resistance of the left side (generator side) of each inductor to chassis ground. The resistance of each phase should be above 5 kOhms. If it is less, consider this a short circuit. 10c) Check Generator for short circuits. Locate the engine terminal block towards the front of the engine and remove its cover. Disconnect the wires from the terminal block that are part of the cable to the DPC. Measure the resistance of each phase of the generator to chassis ground. The resistance should be above 5 kOhms. If it is less, consider this a short circuit. 11. Check DC Bus for Short Circuits Set the Digital Multimeter to the “diode” setting. Place the positive lead of the meter on screw terminal E5 of the DPC Power Board and the negative lead on terminal E4 of the DPC Power Board. 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 E4 and the negative lead is on terminal E5. The display should read between 0.3 and 0.8 volts. If it reads lower, consider this a short circuit. If the reading is higher, there is probably an error in the measurement method. Check that the meter is connected properly. Next, set the Digital Multimeter to measure resistance and place one lead on terminal E5 and the other on chassis ground. The resistance should be higher than 5 kOhms. If it is not, consider this a short circuit. Repeat this measurement for terminal E4. 12. Check RFC Fuses F1 & F2 If you have reached this step according to the trouble- shooting flowchart you have verified that there are no short circuits on the DC Bus in the DPC. Now we will check to see if the DC Bus in the RFC has shorted causing the fuses F1 & F2 to become an open circuit. Locate these fuses at the top of the DPC Power Board. Set the Digital Multimeter to measure resistance and measure across each fuse. The resistance of each should be less than one Ohm. If it is higher or the meter reads “overload” or “out of range”, then the fuses are open. 13. Check RFC DC Bus for Short Circuits Locate screw terminals E12 and E13 at the top of the DPC Power Board. This is where the DC bus of the RFC connects to the DPC DC Bus. Set the Digital Multimeter to the “diode” setting. Place the positive lead of the meter on screw terminal E13 of the DPC Power Board and the negative lead on terminal E12 of the DPC Power Board. Observe Safety Precautions - Refer to Important Safety Instructions for Details 430001-001 Rev A (Apr 2002) 4 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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