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I am trying to read values from a Chessel 5180V Recorder into a MicroLogix 1500 PLC using Modbus RTU. Channel 1 of the 1500 is set up as Modbus Master, the Recorder is Modbus Slave (Node 2). For starters, I tried to read an IEEE Floating Point value of Recorder Channel 1 PV by using the MSG...

First, let me say thanks to all who have taken the time and effort to help me with my problem. I am very impressed with the quality and quantity of advice on this website. I am only one of several engineers at my company who are trying to solve the Drive failure dilema. Before I posted my...

Steep decel's and blower wheel windmilling are dead ends. Failures have occurred at steady state speed, or just sitting there energized (but decel rate has always been set very long anyway). And, the blower wheels do not windmill at all.

Yes, the supply neutral is solidly grounded. The VFD's are all equipped with 3% line reactors. No power factor correction equipment in the plant. Remember, when we have had power monitoring equipment online, we saw no line disturbances at the time of the VFD failure. Furthermore, most times...

The environment that the VFD's operate in does have a certain amount of graphite dust in the air some of the time. It is not excessive and it is not enough that you can even see it in the air. But, you can see a very light coating on the floor at times. We have concentrated on keeping this...

One of our plants has numerous 100HP and 300HP ABB VFD's (both ACS600 and 800 Series). Our plant power is 460/277V. The drives operate off the 460V line. They run cooling gas blowers for our batch processing equipment. These cooling blowers normally run 1 to 2 hours followed by 6 hours off. We...