Andover Controls AC256S Industrial Power Unit

The Andover Controls AC256S Industrial Power Unit is a 120/240 VAC power supply designed to support AC256-based control networks and IOU panels in building automation applications. It provides up to 60 VA of power from mains sources (50/60 Hz) and offers reliable protection with a 1 amp slow-blow fuse and MOV transient protection for surge events. The unit is designed for rugged industrial environments, featuring a NEMA 1-style enclosure with UL94-5V flammability rating and IP20 protection, and it supports an optional full UPS battery backup capable of about one hour of runtime. Communications with the Infinity CX Network Controller is achieved via an L-bus interface, with a selectable baud rate from 300 to 19,200, enabling a large field bus footprint (up to about 4,000 ft with shielded twisted pair; EZLink can extend this range). The IOU panels tied to the AC256S accommodate up to 32 universal inputs per panel and are designed to operate in typical industrial conditions, with an operating environment specified as 32 to 120°F (0 to 50°C) and 10–95% non-condensing humidity. A typical installation weights around 90 lb (40.9 kg), reflecting the solid chassis and integrated protection features intended for continuous operation in technical facilities. This power unit is a key component for AC256-based control architectures, enabling stable power delivery to IOU/CIU modules and ensuring consistent control performance across HVAC, monitoring, and automation tasks.