I know this is a plc site, but I've got a question about a frequency drive.
First, let me say I have little knowledge on this matter.
Today at work we were having trouble with a particular machine that has a Mitsubishi frequency drive on it. It controls an AC motor that is mechanically "coupled" with a worm shaft. After opening up the control cabinet and watching a few machine cycles. A coworker had said to me that the display on the drive was showing that the motor was running at 80 htz. I said, "whats a matter with that". His concern was that the motor that it was driving was only rated at 60 htz and the drive was programmed at 80 htz.
I'm thinking with my little knowledge, that I know this is common because I've seen it done on many other applications. He was kind of confused on how the frequency could be bumped up higher than what the incoming supply voltage frequency was. I had him increase the htz up to 90 and then back down to 60 htz. There was a considerable speed difference and told him, well obviously you can run a motor at higher frequency then the motor rating.
Questions:
1. Is this a normal application?
2. Will it hurt the motor? "It doesn't run continuously"
3. Will a higher frequency cause more noise. "I'm only asking because I believe we have a noise problem with our plc".
Thanks in advance,
Tim
First, let me say I have little knowledge on this matter.
Today at work we were having trouble with a particular machine that has a Mitsubishi frequency drive on it. It controls an AC motor that is mechanically "coupled" with a worm shaft. After opening up the control cabinet and watching a few machine cycles. A coworker had said to me that the display on the drive was showing that the motor was running at 80 htz. I said, "whats a matter with that". His concern was that the motor that it was driving was only rated at 60 htz and the drive was programmed at 80 htz.
I'm thinking with my little knowledge, that I know this is common because I've seen it done on many other applications. He was kind of confused on how the frequency could be bumped up higher than what the incoming supply voltage frequency was. I had him increase the htz up to 90 and then back down to 60 htz. There was a considerable speed difference and told him, well obviously you can run a motor at higher frequency then the motor rating.
Questions:
1. Is this a normal application?
2. Will it hurt the motor? "It doesn't run continuously"
3. Will a higher frequency cause more noise. "I'm only asking because I believe we have a noise problem with our plc".
Thanks in advance,
Tim