The 1AC4007U is a general-purpose V/Hz AC variable-speed drive from Reliance Electric GP-1200 series. It is rated 7.5HP (5.5kW), with three-phase 460VAC input and three-phase 460VAC output, designed to drive standard induction motors for light and medium industrial applications. The suffix U indicates a universal standard enclosure with UL certification. This model is discontinued, and new old stock and refurbished units are commonly used for maintenance and replacement of legacy drive systems.

1 stands for the 1AC series built on GP-1200 AC drive platform. AC means this product is an AC variable-speed drive. 4007 represents the configuration of 460VAC and 7.5HP power rating. U refers to universal standard chassis with UL listing.

The drive accepts three-phase 460VAC input with a voltage tolerance of plus and minus ten percent, working at 50Hz and 60Hz, and the maximum input current is 13.8A. The three-phase output is 460VAC, with maximum output current of 11A and rated capacity of 8.8kVA. Its continuous power rating is 7.5HP (5.5kW). It uses open-loop V/Hz control mode. The speed range ratio is 20:1, and the output frequency varies from 0Hz to 400Hz. The enclosure meets NEMA 1 and IP20 standards and is only for indoor use. Integrated protection functions include overcurrent, overvoltage, undervoltage, overtemperature, short circuit, ground fault and motor stall protection. The operating ambient temperature ranges from 0 degrees Celsius to 45 degrees Celsius, and relative humidity is 5 percent to 95 percent with no condensation. The total weight is approximately 17.2 kilograms.

Power terminals consist of L1, L2, L3 for three-phase AC input, U, V, W for motor connection and PE for protective earthing. Control terminals provide digital signals for start-stop, forward-reverse and fault reset, analog input for 0-10VDC speed reference, and relay output for fault indication rated at 250VAC and 5A. There is no built-in communication port on this drive, and all control and signal transmission rely on hard wiring.

It applies V/Hz open-loop control to ensure stable motor speed even under changing loads. Optimized for 7.5HP medium-duty loads, it features compact structure and reliable performance. It supports 0-10VDC analog speed signal, enabling easy connection with potentiometers, PLC and other conventional control devices. Multiple protection mechanisms effectively protect the drive and motor from various electrical and thermal faults. It can serve as a direct replacement for old 1AC series drives to keep legacy equipment running normally.

It is applicable to conveyors, fans, pumps and mixers equipped with 7.5HP induction motors. It works well for medium-duty processing equipment and commercial air handling systems. It is also an ideal replacement unit for renovation and daily maintenance of old industrial AC drive systems.

Mount the drive vertically in a clean, dry and well-ventilated indoor area, and reserve sufficient space around it for heat dissipation. Use properly specified copper wires for power and control circuits, and separate power cables from control cables to reduce electromagnetic interference. Inspect all connections thoroughly before powering on. For routine maintenance, check the unit appearance, wiring and terminals regularly to find loose connections or damage. Cut off all power before cleaning, and remove dust with dry cloth instead of liquid or chemical cleaning agents. Examine heat dissipation parts and terminals periodically to prevent overheating and corrosion. Judge fault conditions via onboard indicators and resolve all faults before restarting the drive. Internal components are sensitive to static electricity, so do not disassemble the drive without professional guidance. Store spare units in a cool, dry and dust-free environment.