Building a couple machines with 6 motors and 6 VFDs. All the motors are SEW and the VFDs are all ABB ACS355.
Had an odd situation where I couldn't get two of the smallest 1/4 HP motors to run on either of the two VFDs. Both motors were same part number and VFDs were same part number as well. Even after disconnecting the motors from driven equipment they wouldn't run on the bench.
Eventually discovered that they would run fine in V/Hz mode but in vector the drive display would just show 300-400% current draw and the shaft would twitch a bit until the drive tripped due to motor temperature. The motor would occasionally start, but only about 20% of the time.
Has anybody ever seen this before where a motor simply refuses to run in vector mode?
ABB didn't have good explanation. It is just a little 1/4 HP motor and the smallest VFD offered in the ACS355 series. ABB seemed to indicate the motor could be sized too small for the drive as it is only using about 40% of the drive's current capacity. But it is the smallest drive they offer in that series and I had no other choice.
The other 4 motors (5-10 hp range) all run fine in vector mode. These four motors have encoders, the other 2 did not.
Had an odd situation where I couldn't get two of the smallest 1/4 HP motors to run on either of the two VFDs. Both motors were same part number and VFDs were same part number as well. Even after disconnecting the motors from driven equipment they wouldn't run on the bench.
Eventually discovered that they would run fine in V/Hz mode but in vector the drive display would just show 300-400% current draw and the shaft would twitch a bit until the drive tripped due to motor temperature. The motor would occasionally start, but only about 20% of the time.
Has anybody ever seen this before where a motor simply refuses to run in vector mode?
ABB didn't have good explanation. It is just a little 1/4 HP motor and the smallest VFD offered in the ACS355 series. ABB seemed to indicate the motor could be sized too small for the drive as it is only using about 40% of the drive's current capacity. But it is the smallest drive they offer in that series and I had no other choice.
The other 4 motors (5-10 hp range) all run fine in vector mode. These four motors have encoders, the other 2 did not.