Altivar 312 Variable Speed Drives Page 59 Quality Assurance

59 Altivar 312 variable speed drives Quality Assurance Unit operation and burn-in testing Burn-in testing involves four aspects - (I) sample plan, (II) thermal profile, (III) electrical cycling, and (IV) load cycling. Each will vary slightly by the equipment available at each production facility and by the current quality results experienced by each production facility. (I) Sample Plan Burn-in is sampled at a rate that varies from 5% to 100%. The rate is based on current quality results for each production facility. Each production facility is required to burn-in at sample rates determined by the following model. (II) Thermal Profile Constant elevated temperature of 60 C for two hours during which the drive is subjected to electrical cycling for the entire duration of the thermal profile. (III) Electrical Cycles The electrical cycle runs concurrently with the thermal profile. An electrical cycle energizes and de-energizes the drive by connecting and removing AC input power. The drive is energized for the duration of a load cycle (typically 4 minutes) and de-energized to allow the drive power supply to shut down (typically 40 seconds). This cycle repeats continuously during the portions of the thermal profile indicated above. This cycle is repeated continuously during the thermal profile. (IV) Load Cycles Drives are connected to an inertial motor load during burn-in. When the drive is energized, the drive is cycled between high speed forward and reverse operations. Load cycles are made at a minimum interval of 10 seconds. Acceleration and deceleration rates are 0.1s (minimum). The rates are selected to maximize transition stress. Monitoring during burn-in cycle The drive detected fault register and drive speed are monitored during the load cycle. If the drive does not reach the commanded speed then it stops and then indicates that it did not pass the test. Final verification testing This test validates proper operation after burn-in and prepares the drive settings for customer shipment. The following checks are made: DC bus pre-charge check Communication port test Product model verification 7 segment LED display check DC charge LED check CPU version check DC bus level check Fan operation test Nominal load characteristic check Overcurrent test Ground detected fault trip test Brake transistor off check Brake transistor on check Set factory default configuration This document provides information regarding the quality assurance processes and procedures that are in place for the manufacturing of Altivar 312. These are in place to monitor and confirm the quality of the product line that has been designed in from the outset.

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