This post was supposed to be published yesterday. I was unable to get it done because I was too tired to articulate any words. No fieldwork yesterday. Mr. James asked us to explore the use of some special function terminals of the INVT inverter and connect them in parallel with a pilot lamp and a relay. The setup is shown below:

The output of the special function output terminal (HDO Terminal) is supposed to output a 24V DC when it is activated. However, when we measure it, the voltage is less then 20V and it is unable to activate the relay. By the way, that relay is activated or energized when it receives a 24V DC voltage. Can hear a "clip" sound when it's on. After a while troubleshooting the problem, we abandoned the problem and went for lunch.

Around 3.30pm, a customer walked in. He brought with him an inverter and a very speedy motor. The rated speed of the motor is 24000rpm! That's more than twice faster than the fastest hard drive available on the market! Very speedy indeed. And very scary to work on too. Even at half the speed the sound is like the motor is going to explode any minute! 

The motor is cylindrical. Its about the length of an A4 paper and its very heavy. I can barely carry it with my arms! And another interesting feature of the motor is that it has an internal watercooling system! Unfortunately we were unable to simulate the watercooling feature. Sorry I couldn't snap any picture of the motor because the customer was there. I hope I have described enough.

Obviously the customer did not simply walk into the office to show-off his powerful motor. He came with a problem in mind and we, have the solution (Yeah, right!). He wants us to setup the inverter to control the motor and teach him how to setup and program the inverter. Piece of cake! Not until we stumbled on a big problem. During acceleration, the current shoots up too high and the inverter trips when we set the acceleration time to be less than 1.5 minute! But the customer wants it running at full speed in 20 seconds!  That's impossible! After explaining to the customer the situation he finally agreed on the issue.

Unsolvable problem that was. Can't blame the inverter because its one of the high-end inverter and it is Made in Japan. 

I don't know why I was so tired yesterday eventhough there was no fieldwork. Slept early at 10.30pm yesterday.