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P15280 Sensor Guide Sections Types of sensors Specification/Calibration Pin Diagrams Test/Results Troubleshooting/Tips Types of Sensors used on Test Bench 2: K-type thermometer o Sense temperature of AC motor and DC battery 1: CR5310-600 DC Voltage Transducer o Monitor DC voltage of batteries of up to 600Vdc 1: CR4511-500 AC Voltage Transducer o Monitor AC voltage of motor of up to 500Vac 2: Honeywell CSLA2EL Current transducer o Monitor AC current of motor and DC current of batteries of up to 500A AC/DC Specification/Calibration Sensor Senses CR5310-600 CR4511-500 CSLA2EL Analog/Digital Output Analog Analog Analog Power Supply Needed DC voltage 24V AC voltage 24V AC/DC current 10V K-thermocouple Analog Temperature N/A Output range Calibration 0-5Vdc 0-10Vdc Depends on supply voltage Read by program Vin=120Vout Vin=50Vout Current=(Vout5)/(4.3*10^-3) Read by Program Where Vout is the voltage outputted by sensor Vin is the voltage that is monitored Please note that Vin for AC voltage is RMS value and is equal to Vpp/(2*radical(2)). Pin diagrams The section below shows the pin layout and specifications for each sensor used in this project 1. CR4511-500 2. CR5310-600 3. CSLA2EL Pin schematic is not available. There are three pins, (+) for positive power supply, (-) for ground and (o) for output. Test/Results For step by step procedures of the tests, please refer to P15280 Test Plan documentation. The section below talks about the results from testing sensors used in this project. A. AC voltage transducer test For the test, 24Vdc is supplied to the sensors with variable AC/DC voltage inputs to be tested by the sensors. The results are recorded in the tables below. Since the transducers are rated for 600Vdc and 500Vac, the results are more accurate as higher voltage inputs are used. For the AC voltage transducer, the sensitivity equation is Vin=50Vout, where Vout is the voltage output by sensor. For additional clarification, Vin for AC voltage is RMS value and is equal to Vpp/(2*radical(2)). DC voltage transducer test For the DC voltage transducer, the sensitivity equation is Vin=120Vout. B. Current Sensor test The photo above contains the setup for testing the current transducers. 8 Vdc is supplied to power the sensor (Test bench will use Vdd as 10Vdc). Different input voltages are applied and connected to the 10W resistor (to generate different currents) and through the current sensor. The current received by the sensor is amplified by the amount of loops (N). In this case there are 20 loops. The output is hooked up to a multimeter and reads as Vdd/2+4.3mV*N*current. Referring to the results table below, the error ranged from 0-10%. C. Thermocouple test The picture below contains the setup for testing thermocouples. Two thermocouples are hooked up to the data acquisition modules and the cooking thermometer shown is used to verify the output. Ice is applied to the bowl of water until the temperature reached ~0 degrees Celsius. The temperature is captured at 5 different points and can be seen in the table above, the error ranges from 0 to 1.4 degrees Celsius between the two thermocouple outputs and the cooking thermometer. Troubleshooting/Additional Tips Current Transducer Pins are very fragile, as they are exposed and are connecting directly to the circuit board. Take extra care when connecting/disconnecting connectors around pins and try to limit possible sources of vibration to the pins during testing. K-type thermocouples used in this project are connected to a long metal rod which senses temperature. For more accurate measurements, source a shorter rod so that the sense area is smaller and more precise. Voltage transducers used in this project have warranty from manufacturer until September 2016. This warranty covers the cost of troubleshooting and mailing fee from the manufacturer back to you. Make sure voltage transducers have a regulated power supply. For some reason, the power supply from 3rd floor EE Electronics labs managed to burn the supply fuse a couple of times.