Electric Imp Testing Log
April 17, 2003 -Thursday
Testing Begins: All the wires are properly connected. The computer is on and running the SIADIS program. I switch on the Emergency power switch and turn on inverter #1. There is a quiet humming from inverter #1. The SIADIS program goes from <No Data Received> to <Communication OK>.
The Message box displays, "OK / No Start Command".
I press the start button. There is a loud 'CLACK' as the high power contacts close. The Message box reads to "Drive Mode".
I click the three position switch from neutral to forward and twist the potentiometer. An instance hesitation, then the front motor begins to spin.
The front motor is not yet connected, so it spins up quickly. I release the pot and the motor slows and stops. Next up is the rear motor. It is connected through a differential to the wheels. I check that the wheels are off the ground and free to spin. I shut down the inverter #1 and connect the serial port of the computer to inverter #2. I shut down the SIADIS and restart it as a precaution.
...The inverter hums.
Or so I thought. I decide to spin the rear motor again. I turn the pot and instead of the wheels spinning, I hear a load "clack" as the high power contacts open. "Why?"
I shut everything
down including SIADIS. I restart everything in the proper order.
I shut everything down and get the multimeter. The pack reads 385 volts, slightly above nominal (178 batteries X 2.14 volts = 380.92 nominal). This makes no sense.
I try the front motor. It does not work and I get the same message. I knew this was going too smoothly.
I call Victor from Metricmind.com and we consult over the phone. He suggests some things to check but since they involve extensive rewiring I hesitate to try.
18, 2003, Friday - It's the batteries, stupid!
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