Industrial IEMMU02 Chassis Module Infi 90 System Controller

ABB Bailey IEMMU02 Module Mounting Unit is the dedicated chassis used in INFI 90 OPEN systems to house power modules and INFI 90 process modules (including the BRC-100 Harmony Bridge Controller) inside a standard 19-inch cabinet. The MMU consists of a sheet‑metal card cage and backplane, with an open top and bottom to promote airflow, and mounting flanges for 19-inch cabinets. It provides quick installation and removal of modules and uses cable assemblies to interconnect modules: power fail interrupt and power module status signals (+5, +15, -15, +24 VDC) from the DC bus to the MMU backplane via two five‑conductor flat cables; an AC bus to feed the backplane; and separate module bus (three‑wire twisted pair) and I/O expander bus (40‑conductor ribbon) cables for inter‑MMU communications. The part is typically listed with mfr part number IEMMU02 and is designed to fit standard Elsag Bailey INFI 90 rack layouts. Catalog listings report compact form factors (dimensions around 2.2 cm thick, 12.4 cm wide, 12.6 cm deep) and a weight near 1.5 kg, aligning with its role as a modular mounting unit rather than a full processor or I/O module. In MINI 90 and other compact enclosures, rear‑mount or front‑mount variants of IEMMU02 are observed depending on cabinet design; verify the mounting option with your specific enclosure. As a foundational component of ABB’s INFI 90 modular architecture, the IEMMU02 isolates power modules from control modules while preserving accessible cabling for scalable system growth.