5.6　Test Run

5.6.1　Carry out not less than 5 times back-forth move for the rolling mill low-speed screw down device and high-speed screw down device.High-low limiting position shall be accurate.

Inspection method:observation，check test run record.

5.6.2　Not less than 0.5 hour no load run of the main drive motor；the motor drives the reducer for not less than 0.5 hour test run；The motor drives the reducer，gear seat for not less than 0.5 hour test run；The motor drives reducer，gear seat and rolling mill for at least not less than 2 hours test run at 25%，50%，75%，100% of rated speed respectively.The reversible rolling mill shall also need run forward and reverse not less than 1 hour individually according to the aforementioned four classes.When several rolling mills drove by one driving device，supposed to run the first rolling mill，then carry out the test run for the second one and the rest can be done in the same manner until the last one be finished.

Inspection method:observation，check test run record.

5.6.3　Run the roll changing device and other equipment forward and backward 5 to 10 times.The stop position shall meet the requirements of technical documents.

Inspection method:observation，check test run record.