monoblanco
Aluminum
- Joined
- Aug 19, 2005
- Location
- Bay Area, CA
As part of a modernization/rehabilitation project on a Rotex planer, I have mated a TECO JNEV-201-H1 VFD (220 volt, 1 phase input, 3 phase output, 1 HP, V/F or sensorless vector) with a Baldor M3546 motor (208 - 230 volt, 3 phase, 1 HP, 1725 RPM). Both are new and seem to function properly, indeed perfectly, with one puzzling exception -
In vector mode, on first attempted motor start after powering the VFD, frequently the motor will twitch in fractional rotations forward and backwawd while the VFD frequency display will flicker erraticaly. So far, pressing the VFD's motor On/Off button twice to remove and restore power to the motor will correct the problem and all will be well until the next time the motor is again started after the VFD has been powered down and subsequently powered back up. As far as I can tell, all parameters in the VFD are set correctly for the connected motor.
While in a purely manual mode, which this application is, this problem is no more than a minor annoyance, in a more automated situation it would be unacceptable, and I'd really like to understand whats wrong and to correct it. I would greatly appreciate any insights fellow forum members may have on this. Thanks in advance.
In vector mode, on first attempted motor start after powering the VFD, frequently the motor will twitch in fractional rotations forward and backwawd while the VFD frequency display will flicker erraticaly. So far, pressing the VFD's motor On/Off button twice to remove and restore power to the motor will correct the problem and all will be well until the next time the motor is again started after the VFD has been powered down and subsequently powered back up. As far as I can tell, all parameters in the VFD are set correctly for the connected motor.
While in a purely manual mode, which this application is, this problem is no more than a minor annoyance, in a more automated situation it would be unacceptable, and I'd really like to understand whats wrong and to correct it. I would greatly appreciate any insights fellow forum members may have on this. Thanks in advance.