| 摘要 |
PROBLEM TO BE SOLVED: To resolve a problem in prior arts of damages and line stops of line material in the protection function which stop the electromotors suddenly through the overload state detection of the electromotors by each driver wherein many line materials are driven with the electromotors of a stand and each electromotor is controlled to line speed by the independent drivers. SOLUTION: Each protection functional part 27 of each driver can detect an unusual state before becoming in an overload state. When the part detects an unusual state, damege generating of material and stops of manufacture line can be prevented by switching the speed instructions for driver 21 through the relay circuit 28 to the low speed setting machine 29 from the line speed setting machine 22, resulting in switching the high speed that is almost all the cause of overload generating to the low speed. The display machine L in a relay circuit displays the switch of line speed to the low speed. The operation switch SW returns the low speed to the line speed. |
