CDR Engineer Free Essays

I had functioned as vascular help designer to help the cardio vascular imaging frameworks in the district doled out to me. I had assumed the liability to deal with the general assistance conveyance and guarantee the consumer loyalty to the ideal level. I gave master telephone and additionally on location specialized help to handle administration and clients to limit hardware vacation while improving consumer loyalty. We will compose a custom article test on CDR Engineer or on the other hand any comparative theme just for you Request Now I had assumed extra liability to associate and design all the imaging frameworks to the remote online focus through wide band and virtual private system availability. Since I was the specialized help for the locale, I had the duty to deal with the troublesome specialized issues which couldn't be understood by the field administration engineers. I had stepped up to the plate and play out the force and establishing review for the southern district of India. I had been dependable to assemble the specialized help group. I had given an account of strong line to the territorial help supervisor and dabbed line to all India administration director. I had been doled out to deal with and settle the regular disappointment in portable cardiovascular catheterization imaging framework in one of our significant end client site. This framework had numerous breakdown and picture quality issues. I needed to explain the issue and bring back the client certainty level in our gear quality and administration conveyance. I had accepted it as a test and began the work at the site. This Free CDR Template is brought to your civility of gettingdownunder. com †Free Australian Immigration guidance and assets for those hoping to make the descend under. Individual Workplace Activity: Prior to begin the administration work , I had experienced the administration log books and the blunder log records of the framework to realize the main driver of the multipleâ and visit disappointment of the framework. The information examination from the log book and the administration documents, I discovered some genuine force quality and establishing issue on the site. I had chosen to lead the fundamental force and quality review in the site. I examined the force circulation board and found the force link size was under evaluated and incapable to take the heap. During the imaging framework use these force taking care of links fired warming up and brought about link protection emergency. So I prescribed to change the force taking care of links with the right size to withstand the heap. I estimated the ground impedance and discovered it very high. So I assessed the earth pit and found the holding between the earth wire and the earth bar open. The electrical support division of the emergency clinic educated and restorative move had been made right away. When the restorative move was made, I estimated the ground impedance again and found inside the suggested level. I had booted up the imaging framework and run the framework demonstrative tests to disengage the issue. From the demonstrative test outcomes, I presumed the issue in the High voltage and the control hardware. The high voltage circuit comprises of inverter circuit, HV voltage tank with the fiber transformer, HV links for the anode and the cathode, and the x-beam tube. The square chart as follows Since there was no x-beam yield from the cylinder, I began the investigating from the snubber board which feed the essential side of the HV tank. The snubber board contains four Insulated Gate Bipolar Transistors that switches the huge flows applied to the contribution of the enormous advance †up transformer in the High voltage tank. This pcb is structured with exceptionally low DC opposition and inductance to limit the voltage drops at high flows. The resistorcapacitor-diode organize on the board is utilized to clammy the IGBT switch spikes. P. E. 2. 8 Due to the nonappearance of x-beam age, the framework showed low MA and low KV mistake message on the reassure screen. This is because of nonappearance of yield from the auxiliary side of the HV tank. So I turned off the whole framework and I checked the 400v, 70amps semiconductor intertwine on the snubber board and thought that it was imperfect. This wire may be blown because of the flaw current created from the x-beam tube spit. The x-beam tube spit is produced in the glass tube addition of the x-beam because of the arrangement of metallization on the glass dividers. At that point I checked This Free CDR Template is brought to your kindness of gettingdownunder. com †Free Australian Immigration guidance and assets for those hoping to make the descend under. obstruction between IGBT producer terminal and the case ground with the genuine RMS multimeter and discovered short. This demonstrated the harm of wire protection in the IGBT. I discovered both the IGBT module flawed with the producer to frame ground short. So I supplanted the IGBT module with the enhanced one. After the substitution of IGBT module, I expelled the anode and cathode HV link on the cylinder side and investigated the HV link connector and discovered part of carbon stores because of the cylinder spit. The carbon store on the HV link pins hamper the compelling conductivity, so I cleaned the connectors with Chemotronics Electro-wash arrangement. I checked the HV repository well on the xray cylinder and discovered it totally harmed. The protection between the fiber flexibly and matrix was totally lost. So I discovered it not repairable and the whole x beam tube get together required the substitution. I supplanted the x-beam tube gathering with the upgraded one. Before the force on, I chose to twofold check the HV tank which is the principle part of HV Circuit. The HV tank builds up the very high voltage important to work the x-beam tube (up to 125kv). The tank incorporates full advance up transformer, high voltage rectifiers, x-beam tube fiber transformers, yield mama and KV sensors and connectors. I checked the rectifiers and the essential and auxiliary windings of the transformer for any imperfection and discovered everything alright. P. E. 2. 11 Then I chose to do the KV in Open Loop test in HV tank. So I expelled the HV links on the HV tank yield and filled the HV tank yield container with mineral oil. Later I turned on the framework and run the KV open circle test and it passed alright. At that point I reestablished the HV link association between the tank and the x-beam tube in framework off state. P. E. 2. 12 The x-beam cylinder and IGBT module substitution required the accompanying alignment and alterations for the ordinary and safe capacity of the framework IGBT Module Dead time wave structure modifications Filament Calibration KV and MA metering alignment Radiation portion alignment First I needed to alter the dead time between the KV drives flags on every one of the IGBT sets to continue with the other adjustment appropriately. The inappropriate dead time modification may prompt harm of IGBT and the Generator driver load up (which supplies the trigger heartbeat to the IGBT module). I associated the double follow oscilloscope on the test focuses on the Generator driver board and watched the waveform of both the IGBT drive signal. I found the drive signal between the base and producer of the IGBTs out of resilience during the pinnacle load. So this may prompt cross-conduction in the IGBT module and the obliteration of IGBT module. This Free CDR Template is brought to your politeness of gettingdownunder. com †Free Australian Immigration guidance and assets for those hoping to make the descend under. The Generator driver PCB’s essential occupation is to change over the KVP drive signal from the High Voltage Supply controller PCB to the levels important to drive the IGBTs on the SNUBBER PCB. So I associated the oscilloscope in the high voltage controller PCB test focuses and found the sufficiency and recurrence of the waveforms typical. So the underlying driver was segregated and related to the Generator driver PCB. The issue was found on two of comparator’s yield drives the entryway transformers, which give disengagement from the high present hardware and from high voltages present on every one of the IGBT module. The blemished comparator IC chips were evacuated and supplanted with the enhanced one. After the substitution of the comparator IC chips the drive signals were discovered typical. I had continued with the IGBT dead time modification with the degree meter associated with the generator driver PCB and set it inside the more secure breaking point. I had checked the waveforms on the degree meter during the pinnacle load condition and discovered alright. I played out the fiber alignment at various KV and Ma station and refreshed the framework fiber drive database. This refreshed database may be utilized by the fiber driver PCB to drive the fiber transformer to yield right x-beam tube flow concurring the radiation method. After the fiber alignment, I balanced the KV and MA metering change in accordance with sense and show the right KV and MA estimation of X-beam tube on the support during the time radiation introduction. Likewise I adjusted the X-beam shaft with the picture intensifier in various Field of perspectives. Accordingly I had run the collimator alignment for altering the collimator sharp edges in various field of perspectives. The camera Iris opening is changed in accordance with set the radiation portion at a more secure cutoff suggested by the maker. The picture quality was tuned to ideal level. Outline I had checked and tuned the imaging framework for the ideal picture quality. I run diverse introduction strategies with the Image Quality Signature Test Phantom and found the qualities inside the particular. The client was enchanted with the presentation and the This Free CDR Template is brought to your kindness of gettingdownunder. com †Free Australian Immigration exhortation and assets for those hoping to make the descend under. picture nature of the framework after the culmination of the administration work. It was a test for me to investigate the framework with numerous disappointments. Throughout inconvenience shooting I investigated the circuits and disengaged the issue zones with the assistance of the information obtained from my field understanding and building