RELIANCE B-60000 PMI Processor Module

The RELIANCE/Reliance PMI Processor Module, commonly cataloged as 0-60021-4 and grouped into the 60000 series (60000, 60000-A, 60000-B) or the B/M-60021-* designations, is a CPU card for Reliance Electric Automax PMI racks used in SA3000 high‑power drive systems. As the PMI Rack’s central processor, it handles the Power Module Interface (PMI) backplane communications and coordinates control data between the drive’s PM power modules and the host control logic in eight‑slot PMI racks. Verified variants include 0-60021-4 and B/M-60021-*, with related 60000‑series counterparts. The PMI Rack is described as an eight‑slot backplane assembly housing the PMI Processor Module alongside the power supply, resolver I/O, and DC technology module, forming a complete drive‑control ecosystem for high‑power Automax installations. Several catalog entries and refurbish/repair listings identify the 0-60021-4 PMI Processor Module as a discontinued Reliance/Automax part, reflecting its status in contemporary catalogs. In practice, the PMI Processor Module enables reliable motor control and resolver feedback within the Reliance/Baldor Automax drive framework, plugging into the PMI backplane and communicating with adjacent PMI modules to implement drive‑control logic.