Prince
Member
- Join Date
- Jun 2002
- Posts
- 284
I have a problem with a DC Motor of 250Kw. We try to process hot steel bars.
We are using these motors with speed control in a roughing chain of Rolls. Normally We see used power very low before we feed the material. As we expect we will see the full load when the material is fed to the chain of rolls and the current gets normal as it crosses each of the rolls.
The problem happens when the process finishes in the last roll. Then we see an overcurrent in the last DC motor. This shock is so high that it burns down the fuses on transformers. It seems very confusing as I have no load on the roll when I see the overcurrent.
Why is this happening? Can I solve this problem by Torque controlling the last roll? Does anyone have a suggestion for me
We are using these motors with speed control in a roughing chain of Rolls. Normally We see used power very low before we feed the material. As we expect we will see the full load when the material is fed to the chain of rolls and the current gets normal as it crosses each of the rolls.
The problem happens when the process finishes in the last roll. Then we see an overcurrent in the last DC motor. This shock is so high that it burns down the fuses on transformers. It seems very confusing as I have no load on the roll when I see the overcurrent.
Why is this happening? Can I solve this problem by Torque controlling the last roll? Does anyone have a suggestion for me