I have a Teco JNEV-203-H1 variable frequency drive that I just received. When enabled, it will run up and oscillate between 5-6 hertz. After I disable then re-enable and off we go and will run up to speed.
This depends on the motor that is being used. We have seen this before with other vendors motors. Because the drive is defaulted in sensorless vector mode and the algorithms are pre-set for TECO motors, the units sometimes get "confused" by other motors in sensorless vector mode.
You should convert from Sensorless Vector to V/f
1. Set parameter F51 to 1 to access C parameters. Then Press the function button to get the C menu.
2. Set C14 = 001, and the problem should disappear.
Marshall Wolf Automation can help you with your variable frequency drive applications!