The 1AC4002U is a 2HP (1.5kW) general-purpose V/Hz AC variable-speed drive belonging to Reliance Electric GP-1200 series. It features three-phase 460VAC input and three-phase 460VAC output, and is developed for driving standard induction motors in light industrial and commercial scenarios. The suffix U stands for universal standard chassis with UL certification. This product has been discontinued, and new old stock and refurbished units are widely used for replacement and maintenance of legacy equipment.

1 represents the 1AC series based on GP-1200 AC drive platform. AC indicates the product category of AC variable-speed drive. 4002 refers to the configuration of 460VAC and 2HP power rating. U means universal standard enclosure with UL listing.

Input is three-phase AC at 460VAC with a tolerance of plus and minus ten percent, compatible with 50Hz and 60Hz, and the maximum input current is 4.2A. The output is three-phase 460VAC, with maximum output current of 3.4A and rated capacity of 2.7kVA. The continuous power rating is 2HP (1.5kW). It adopts open-loop V/Hz control mode. The speed regulation ratio reaches 20:1, and the output frequency ranges from 0Hz to 400Hz. The enclosure complies with NEMA 1 and IP20 standards for indoor installation. Built-in protection functions include overcurrent, overvoltage, undervoltage, over temperature, short circuit, ground fault and motor stall protection. The operating ambient temperature is from 0 degrees Celsius to 45 degrees Celsius, and the relative humidity ranges from 5 percent to 95 percent without condensation. The overall weight is approximately 11.3 kilograms.

Power terminals include L1, L2, L3 for three-phase AC input, U, V, W for motor output and PE terminal for protective earthing. Control terminals cover digital signals for start-stop, forward-reverse and fault reset, analog input for 0-10VDC speed reference, and relay output for fault indication with rating of 250VAC and 5A. This drive has no built-in communication ports, and all control and signal transmission are realized through hard wiring.

It adopts V/Hz open-loop control to deliver stable speed performance for common induction motors and keep steady operation when load changes. Designed for 2HP light-duty loads, it features compact structure and high cost efficiency. It supports 0-10VDC analog speed signal, which can be easily connected with potentiometers, PLC and other conventional control devices. Multiple protection functions can effectively prevent damage to the drive and matched motor caused by various electrical and thermal faults. It is a direct replacement for old-style 1AC series drives to maintain the normal operation of legacy systems.

It is suitable for small conveying equipment, fans, pumps and mixers equipped with 2HP induction motors. It can be applied to light-duty processing equipment and commercial ventilation systems. It is also an ideal replacement part for renovation and routine maintenance of old industrial and commercial AC drive systems.

Install the drive vertically in a clean, dry and well-ventilated indoor space, and reserve enough gaps around the unit to ensure smooth heat dissipation. Select copper wires with matched specifications for power and control circuits, and separate power cables from control cables to reduce electromagnetic interference. Check all connections carefully before powering on. Conduct full visual inspection for damages and loose terminals during regular maintenance. Cut off the power supply before cleaning, and wipe dust with dry cloth instead of liquid or chemical cleaners. Regularly check the heat dissipation components and wiring terminals to eliminate hidden troubles such as overheating and corrosion. Use onboard indicator lights to judge fault types and troubleshoot completely before restarting the drive. Internal components are sensitive to static electricity, so do not disassemble the unit without professional guidance. Store spare products in cool, dry and dust-free environment.