57412 RELIANCE ELECTRIC DRIVE CONTROL

The 57552-4 is a user-programmable control system that uses microprocessors to control AC and DC drives in real-time. It has 256 Kbytes of non-volatile read/write flash memory, 512 Kbytes of volatile SRAM, and 4 Kbytes of dual-port SRAM. This module has the ability to connect to two different PMIs using a fiber-optic link. It can be plugged into an AutoMax card rack assembly, taking up only one of its slots. Up to 10 UDC modules can be plugged into a single rack, meaning that a single rack now has the ability to control up to 20 drives. It can communicate with the processor module on the rack using the Multibus.

The 57552-4 has many features on its faceplate. It has a series of six LED indicators. These are labeled Card OK, OS OK, COMM A OK, DRV A FLT, COM B OK, and DRV B FLT. There are test switches that are numerically labeled 1-3 and N.O. There are meter ports that are numerically labeled 1-4 and COM. There are two sets of com ports. COMM A ports are labeled XMT and RCV. COMM B ports are also labeled XMT and RCV.