American Locomotive
Well-known member
Hey everyone, I'm helping a buddy set up his shop. He purchased a bunch of 3 phase equipment cheap, so I've been helping him with getting setup with VFDs.
Most of my VFD experience has been with Automation Direct drives, which have amazingly comprehensive manuals that explain things in very straightforward language. We elected to go with Teco drives for his equipment, as many of the Automation Direct drives are out of stock. Unfortunately the Teco manuals, while very thorough, don't explain things that awesome.
The issue we're having is with his Teco E510 drive on his mill. It works perfectly in V/Hz mode, but we wanted to employ SLV (sensorless vector mode) for greater low-RPM power. I set up the parameters to the best that I could figure out, and did the rotational autotune. It all works fine, speed control works well, and it has good low RPM torque. The problem is there is a long delay between when you hit "Forward - Run" and when the motor actually starts turning.
When you engage forward, you can see the frequency display instantly go up to 65-70 Hz, quickly work its way down to ~0-1hz. The motor is not spinning at all during this time. Once the displayed frequency hits around 0-1 Hz, the motor will twitch a couple of times, fully engage and then follow the normal motor acceleration curve. It's about a 2-3 second delay before the motor actually starts turning from initial Run command. I cannot figure out which parameter is causing this behavior, or if it's a normal part of SLV mode. As soon as I switch the drive back to V/Hz mode, that behavior goes away. You push "Forward - Run", and it just starts out at your minimum frequency and ramps up as normal. As soon as you toggle SLV mode, it starts up doing that weird behavior - but once the motor is actually running, it works well in SLV mode.
Any ideas before I try contacting Teco?
Most of my VFD experience has been with Automation Direct drives, which have amazingly comprehensive manuals that explain things in very straightforward language. We elected to go with Teco drives for his equipment, as many of the Automation Direct drives are out of stock. Unfortunately the Teco manuals, while very thorough, don't explain things that awesome.
The issue we're having is with his Teco E510 drive on his mill. It works perfectly in V/Hz mode, but we wanted to employ SLV (sensorless vector mode) for greater low-RPM power. I set up the parameters to the best that I could figure out, and did the rotational autotune. It all works fine, speed control works well, and it has good low RPM torque. The problem is there is a long delay between when you hit "Forward - Run" and when the motor actually starts turning.
When you engage forward, you can see the frequency display instantly go up to 65-70 Hz, quickly work its way down to ~0-1hz. The motor is not spinning at all during this time. Once the displayed frequency hits around 0-1 Hz, the motor will twitch a couple of times, fully engage and then follow the normal motor acceleration curve. It's about a 2-3 second delay before the motor actually starts turning from initial Run command. I cannot figure out which parameter is causing this behavior, or if it's a normal part of SLV mode. As soon as I switch the drive back to V/Hz mode, that behavior goes away. You push "Forward - Run", and it just starts out at your minimum frequency and ramps up as normal. As soon as you toggle SLV mode, it starts up doing that weird behavior - but once the motor is actually running, it works well in SLV mode.
Any ideas before I try contacting Teco?