Product Description The 1AC4110U is a 10HP (7.5kW) general‑purpose open‑loop V/Hz AC variable‑speed drive from the Reliance Electric GP‑1200 series, designed for 460VAC three‑phase input (North American standard). It features a NEMA 1 (IP20) enclosure for indoor light‑to‑medium industrial and commercial applications. Now discontinued, it is widely available as new old stock or refurbished units for legacy system replacement and maintenance. Model Number Interpretation 1: First‑generation GP‑1200 series platform AC: AC variable‑speed drive 4: 460VAC voltage class 1: NEMA 1 enclosure 10: 10HP power rating U: United States version, 460VAC fixed input, UL‑listed Technical Specifications Input: Three‑phase 460VAC ±10%, 50/60Hz; maximum input current 17.2A; input KVA 13.6kVA Output: Three‑phase 460VAC; maximum output current 14.2A; rated motor current 13.5A Power: 10HP (7.5kW) continuous Control: Open‑loop V/Hz; speed ratio 20:1; output frequency 0–400Hz; variable torque curves and torque boost Enclosure: NEMA 1, IP20 (indoor use only) Protection: Overcurrent, overvoltage, undervoltage, overtemperature, short circuit, ground fault, motor stall, line transient protection Ambient: 0–45°C, 5%–95% RH (non‑condensing) Weight: Approximately 15.9kg Interface and Communication Configuration Power Terminals: L1/L2/L3 (three‑phase input), U/V/W (motor output), PE (protective earth) Control Terminals: Digital inputs for start/stop, forward/reverse, fault reset; analog input 0–10VDC for speed reference; relay output for fault indication (250VAC/5A) Communication: No onboard communication ports; hardwired control only Indicators: Two LEDs; green for power/run, red (IET) for drive fault Core Functions Open‑loop V/Hz control with adjustable torque curves and torque boost for reliable starting and steady‑state operation Fixed 460VAC input optimized for North American power grids 0–10VDC analog speed input compatible with potentiometers and PLCs Comprehensive electrical and thermal protection safeguards drive and motor Direct drop‑in replacement for legacy 1AC series drives, ensuring compatibility with existing wiring and control schemes Application Scenarios Medium‑sized conveyors, fans, pumps, mixers, and processing machinery with 10HP motors in North America Light‑to‑medium manufacturing, commercial HVAC, and ventilation systems operating on 460VAC three‑phase power Retrofit and maintenance of older industrial and commercial AC drive installations Usage and Maintenance Instructions Mount vertically in a clean, dry, well‑ventilated indoor area with adequate clearance for cooling airflow Use rated copper conductors; separate power and control cables to minimize electromagnetic interference Inspect all connections before power‑up; check terminals and wiring periodically for looseness or corrosion Disconnect power before cleaning; use a dry cloth only—do not use liquids or chemical cleaners Routinely monitor heat sinks and terminals for signs of overheating Diagnose faults via onboard LED indicators; resolve all issues before restarting the drive Avoid static electricity discharge; do not disassemble the unit without professional guidance Store spare units in a cool, dry, dust‑free environment