Download P15280 Sensor Guide

P15280 Sensor Guide
Sections
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Types of sensors
Specification/Calibration
Pin Diagrams
Test/Results
Troubleshooting/Tips
Types of Sensors used on Test Bench
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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
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1: CR4511-500 AC Voltage Transducer
o Monitor AC voltage of motor of up to 500Vac
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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
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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
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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.