Tuesday, August 26, 2008

Rong Fu Report (RF45) - 2: Setup and Inspection

I purchased the mill through J&L Industrial and had lots of conversations with them because the trucker lost the shipment and the situation got complicated. Their customer service is first rate and I have nothing but good things to say about them. During one of these conversations one of their supervisors said that they tested and lubricated these mills and when I checked all the grease points had fresh clean grease and the oil appeared very clean.

Visually, there was one cosmetic flaw in the table casting (L side of the table in the photo) and, l0oking at the inside of the column, there was some casting flash that was easily removed. In addition I was disappointed that the table handles were plastic rather than metal but, all things considered, the mill seemed well made and at the high end of import machinery.

The power to my garage is a long heavy duty extension cord connected to a 110V, 20 amp circuit. This mill comes with either a 1.5 HP, 220V single phase motor or a 1 HP, 3 phase motor. Due to my power limitation, I opted for the 3 phase motor because I could fit a 110V VFD inverter to it. I knew that DrivesWarehouse carried a TECO that would fit these specs. I called them first and got a sales person who was not helpful in answering my questions about how to set up the VFD for a mill.

Surfing the web I found a less expensive TECO at Dealers Industrial Equipment Their sales engineer explained that the JNEV-101-H1, was both newer and had more features than the FM50-101-C and, in particular, produced wave forms that were easier on the motor. His expertise sold me so I bought the VFD and mounted it on a board with a main disconnect, a heavy duty power cord, and a 110V receptacle for the mill X drive motor.

With some trepidation, I wired the mill to the VFD and when I fired it up, the VFD came on but the mill just sat there. What had I done wrong? Finally I figured out that the '5' on the VFD display was hertz rather than amps so I cranked it up to 60hz and the mill started running - that is to say it started running backwards. An easy fix - swapped two of the three hot leads - and it ran in the correct direction.

No comments: