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Repeat this process for each of the connectors J2 through J6, and observe which connector causes the voltage to go low. Once the responsible connector is found, it should be easy to trouble- shoot to the faulty component. If the voltage is less than 13.8 VDC, the problem is either with the DPC Control Board or the DPC Power Board. SHUT DOWN THE MAIN POWER. Disconnect the J22 connector from the DPC Power Board, and disconnect connectors J12 and J15 from the DPC Control Board. TURN ON THE MAIN POWER. Measure the voltage at connector J22 on the DPC Power Board between pins 3 and 5 at the bottom of the connector (counting from left to right). If the voltage is 13.8 VDC, the problem is in the DPC Control Board. If the voltage is less than 13.8 VDC, the problem is in the DPC Power Board. 6. Check Control Board LED’s Locate the Control Board towards the left side of the DPC. There should be several LED’s continuously illuminated and others that may be flashing. At a minimum, make sure that LED’s D33, D35, and D61, located towards the bottom right, are on. There should also be a flashing LED towards the middle/right of the board which indicates that the processor is executing the main code. TURN OFF POWER FOR THE REMAINING STEPS. WARNING: Perform the following steps with the power turned OFF. Failure to turn OFF the power may cause personal injury or death, or damage to equipment. 7. Check Cable W201 Cable W201 transfers low voltage power from the Power Board to the Control Board. If this cable is damaged, the Control Board will not turn on. Remove this cable and check continuity of each pin from one connector to the other. Also, check that each pin is properly inserted into the connector housing and no pins are visibly damaged. 8. Measure Precharge Resistors The precharge resistors are located on the upper right hand side of the DPC. These resistors allow the grid voltage to charge up the DC bus when the main power to the MicroTurbine is supplied. The precharge resistors are labeled R1, R2 and R3 on the “Precharge Board” but can be easily measured at the terminals of the Contactor. Set the Digital Multimeter to measure resistance. Locate the Contactor at the top of the DPC and measure the resistance across each phase (L1 to T1, L2 to T2, L3 to T3). The resistance should be between 9 and 11 Ohms. 9. Check Inverter for Short Circuits There are 4 inverter inductors located immediately to the right of the Power Board in the DPC. Each inductor has two terminals, one connected to the Power Board and one connected to a wire that goes to the Contactor. 9A. Check Inverter IGBTs for Short Circuits Remove the screws connecting each inductor to the Power Board at terminals E6, E9, E10 and E11. 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.). Disconnect ground from the Neutral. Measure the resistance of each terminal E6, E9, E10 and E11 to chassis ground. The resistance should be above 5 kOhms. If it is less, consider this a short circuit. 9B. Check Inverter Inductors for Short Circuits With the inductors still isolated from the Power Board, measure the resistance of the right side (grid side) of each inductor to chassis ground. The resistance of each phase should be over 5 kOhms. If it is less, consider this a short circuit. 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. Observe Safety Precautions - Refer to Safety Instructions for Details 430001-001 Rev D (June 2003) 1-8 Model C30 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 | Capstone Table of Contents ALL Series Fault Codes
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