We have a 480V Powerflex 40 1hp VFD that continuous to blow one of the fuses on the line side of the drive and then continue to operate on single phase supply. The fuse size that keeps blowing is a 6A fuse.
This motor is a 9-lead motor which origonally was wired incorrectly, which we thought was the problem, however now we have confirmed that the motor is wired correctly and it is still blowing this same phase fuse every time.
I would'nt suspect the fuses are too small because after the fuse blows and the drive is running on single phase supply we would expect the current on the two remaining phases to increase and thus blow the other two fuses if they were marginal.
Anybody have any idea what can be causing the same phase fuse on the line side to keep blowing?
This motor is a 9-lead motor which origonally was wired incorrectly, which we thought was the problem, however now we have confirmed that the motor is wired correctly and it is still blowing this same phase fuse every time.
I would'nt suspect the fuses are too small because after the fuse blows and the drive is running on single phase supply we would expect the current on the two remaining phases to increase and thus blow the other two fuses if they were marginal.
Anybody have any idea what can be causing the same phase fuse on the line side to keep blowing?