Combined Thermal Shock G-Force HALT Test on HiQ Solar TS480-8k TrueString Inverter
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1 Combined Thermal Shock G-Force HALT Test on HiQ Solar TS480-8k TrueString Inverter Prepared for: HiQ Solar, Inc Duane Avenue, Suite 101 Santa Clara, CA Phone (408) Page 1 of 19
2 Combined Thermal Shock G-Force HALT Test Document Number 2755 Test Dates: 02/12/2015 TrueString 480V Inverter Model Number: TS480-8K Testing Performed for: HiQ Solar, Inc. Phone: (408) Duane Avenue, Suite 101 Web: Santa Clara, CA Testing Performed by: Phone: (408) Thompson Place Fax: (408) Sunnyvale, CA Reference Documents Document Revision Number Date Issued Page 2 of 19
3 Table of Contents: 1. Objective Scope Acronyms and Definitions Executive Summary Combined Environment Profile Test Results - Level Products Tested Temperature Test Setup Vibration Test Setup Test Equipment and Calibration Records Customer Test Equipment Reliant Labs Calibration Records Functional Test Description...10 Appendix A Photographs...11 Appendix B HALT Six Degrees of Freedom Random Vibration...15 Page 3 of 19
4 1. Objective Combined Thermal Shock G-Force HALT Test is performed to uncover latent defects in product design, component selection, and/or manufacturing that would not otherwise be found through conventional qualification methods. The process subjects the test sample to a combination of temperature and vibration to precipitate inherent defects. 2. Scope Run the Level 1 combined environment profile on a functional HiQ Solar TrueString 480V Inverter (HiQ Solar TS480-8k). 3. Acronyms and Definitions H.A.L.T. Highly accelerated life test UUT Unit under test Grms Gravity Root Means Squared. 4. Executive Summary The HiQ Solar TS480-8k sample remained operational and passed during the Level 1 combined temperature and vibration profile. Page 4 of 19
5 12:00 AM 12:08 AM 12:16 AM 12:25 AM 12:33 AM 12:41 AM 12:50 AM 12:58 AM 1:06 AM 1:15 AM 1:23 AM 1:31 AM 1:40 AM 1:48 AM 1:56 AM 2:05 AM 2:13 AM 2:21 AM 2:30 AM 2:38 AM 2:46 AM 2:55 AM 3:03 AM 3:11 AM 3:20 AM 3:28 AM Temperature (C) / Vibration (Grms) Test Report Number Combined Environment Profile Level 1 - Combined Thermal Shock G-Force HALT Profile: Lower Set Point: -40 C Upper Set Point: +65 C Ramp Rate: 10 C per minute Dwell Time at each extreme: 10 minutes Cycle Length 41 minutes Total Cycles: 5 Test Duration: 3.4 hours U.U.T.s Functional Samples per Test: 1 unit 80 Combined Temperature and Vibration Profile - Level Time Temp Setpoint Vibe Setpoint Figure 1 Combined Environment Test Profile - Level 1 Page 5 of 19
6 6. Test Results - Level 1 The UUT was exposed to 5 rapid temperature cycles from -40 C to +65 C combined with vibration. The vibration level was set to a constant 25 Grms. The dwell time at each temperature extreme was 10 minutes and the thermal transition rate was set to 10 C per minute. The UUT was monitored for functionality throughout the combined environment process. Table 1: Combined Environment Results Cycle Chamber Set point ( C) Chamber Set point (Grms) Pass/Fail Pass 1 Transition 25 Pass Pass 1 Transition 25 Pass Pass 1/2 Transition 25 Pass Pass 2 Transition 25 Pass Pass 2/3 Transition 25 Pass Pass 3 Transition 25 Pass Pass 3/4 Transition 25 Pass Pass 4 Transition 25 Pass Pass 4/5 Transition 25 Pass Pass 5 Transition 25 Pass Pass 5 Transition 25 Pass Pass Test Date: 02/12/2015 Test Sample: SN_2722 Comments Page 6 of 19
7 9:43 AM 9:52 AM 10:00 AM 10:08 AM 10:17 AM 10:25 AM 10:33 AM 10:42 AM 10:50 AM 10:58 AM 11:07 AM 11:15 AM 11:23 AM 11:32 AM 11:40 AM 11:48 AM 11:57 AM 12:05 PM 12:13 PM 12:22 PM 12:30 PM 12:38 PM 12:47 PM 12:55 PM 1:03 PM 1:12 PM Temperature (C) / Vibration (Grms) Test Report Number Combined Temperature and Vibration Chamber Data - Level Time Temp Setpoint Temp Control Temp Air Vibe Setpoint Vibe Table (input) Figure 2 Combined Environment Chart Page 7 of 19
8 7. Products Tested Table 2: Product Identification Description Model Number Revision Serial Number HiQ Solar TrueString 480V String Inverter HiQ TS480-8k Temperature Test Setup Airflow from the chamber was directed onto the UUT using 4 aluminum ducting. This allowed for better temperature stabilization during the thermal cycling process. Pictures illustrating the temperature test setup are located in Appendix A. 9. Vibration Test Setup The UUT was mounted to the vibration table using two 16 L x 2 W x 1 H sections of aluminum channel. The aluminum channel were bolted to the vibration table at four locations using 3/8-16 threaded steel rod. Pictures illustrating the fixture setup are located in Appendix A. Page 8 of 19
9 10. Test Equipment and Calibration Records Customer Test Equipment Functional test equipment provided by the customer and used to conduct the H.A.L.T. testing is detailed below. The model number and serial number have been documented to aid in the reproducibility and repeatability of test results. Table 3: Customer Test Equipment Description Manufacturer Model Number Quantity AC Transformer Temco TT DC Power Supply Main Wall S Gateway HiQ Solar GTWY1-Rev A Reliant Labs Calibration Records Equipment used to conduct the testing is detailed below. All test equipment that requires periodic calibration was in current calibration at time of test. The calibration certifications are traceable to the National Institute of Standards and Technology (NIST). Table 4: Reliant Labs Calibration Records Lab 5 Description Manufacturer Model Number Serial Number Calibration Due HALT Chamber Qualmark Typhoon T /06/2015 Thermocouples Omega TT-T-30-SLE ROHS NA NA Accelerometer Control PCB P /23/2015 Page 9 of 19
10 11. Functional Test Description During testing the UUT was continually monitored for functionality. Test equipment used to monitor the UUT was set up on a bench outside the H.A.L.T. chamber. Cables, wires, and power cords were fed through the chamber access port. Before running the H.A.L.T., the following modifications were made to the UUT: Functional test cables were modified to reach outside the chamber. During the test process, any abnormalities are considered possible failure modes until they can be determined otherwise. To establish clear failure characterization the list below details acceptable specifications and/or unit functionality. Monitored LED status and current draw throughout the test. The following was monitored on the communications Gateway: System health. Power output. Page 10 of 19
11 Appendix A Photographs Figure A.1. Temperature & Vibration Test Setup Page 11 of 19
12 Figure A.2. Chamber Control Thermocouple Location Page 12 of 19
13 Figure A.3. Test Equipment Setup Page 13 of 19
14 Figure A.4. Chamber Lab Setup Page 14 of 19
15 Appendix B HALT Six Degrees of Freedom Random Vibration HALT vibration systems produce energy in all six axis simultaneously (x, y, z, pitch, roll and yaw). The frequency output is broadband from 2 Hz to 5 KHz. Z Y Y X Figure 3 Tri Axial Accelerometer Figure 4 X, Y, Z, Pitch, Roll & Yaw Pneumatic or repetitive shock 6DOF vibration HALT chambers produce a continuously varying pseudo-random broad spectrum vibration. The vibration is controlled from a single accelerometer mounted at the center underneath the vibration table. The root mean square (RMS) value of this signal can be calculated by squaring the magnitude of the signal at every frequency, finding the average (mean) value of the squared magnitude, and then taking the square root of the average value. The resulting number is the Grms. Page 15 of 19
16 Accelerometer 2 Z-axis Accelerometer 4 Y-axis Accelerometer 3 X-axis Figure B.1 Location of Accelerometers 2-4 Page 16 of 19
17 Accelerometer 6 X-axis Accelerometer 5 Z-axis Figure B.2 Location of Accelerometer 5-6 Page 17 of 19
18 Grms2/Hz Test Report Number 2755 PSD Vibration Plot - 25 Grms 2 Hz 2.5 khz 1.0E+00 Power Spectral Density 1.0E E E E E Frequency (Hz) Channel 1 (16.9 Grms) Channel 2 (11.07 Grms) Channel 3 (6.54 Grms) Channel 4 (4.96 Grms) Channel 5 (18.17 Grms) Channel 6 (5.87 Grms) Spectrum Analyzer Channel Assignment Channel Axis Location or Description 1 Z Mounted underneath the vibration table at center. 2 Z Front - Mounted on the Z axis 3 X Front - Mounted on the X axis 4 Y Front - Mounted on the Y axis 5 Z Back - Mounted on the Z axis 6 Z Back - Mounted on the X axis Note: The X-axis runs through the chamber doors, the Y-axis runs from the access portal to air plenum, and the Z-axis is vertical to the vibration table. Page 18 of 19
19 Grms2/Hz Test Report Number 2755 PSD Vibration Plot - 25 Grms 2 Hz 10 khz 1.0E+01 Power Spectral Density 1.0E E E E E E Frequency (Hz) Channel 1 (26.45 Grms) Channel 2 (13.93 Grms) Channel 3 (10.15 Grms) Channel 4 (8.92 Grms) Channel 5 (21.8 Grms) Channel 6 (14.74 Grms) Spectrum Analyzer Channel Assignment Channel Axis Location or Description 1 Z Mounted underneath the vibration table at center. 2 Z Front - Mounted on the Z axis 3 X Front - Mounted on the X axis 4 Y Front - Mounted on the Y axis 5 Z Back - Mounted on the Z axis 6 Z Back - Mounted on the X axis Note: The X-axis runs through the chamber doors, the Y-axis runs from the access portal to air plenum, and the Z-axis is vertical to the vibration table. Page 19 of 19
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