Product Description:

The 8I76T400400.00-000 is an inverter module manufactured by B & R Automation for the 8I7 ACOPOS Inverters series. It converts fixed-frequency three-phase mains power into variable voltage and frequency so an asynchronous motor can follow speed commands. Inside a control cabinet, it provides electronic speed regulation, fast torque response, and coordinated braking without mechanical contactors. Typical uses include packaging lines, conveyors, and handling axes that demand dynamic positioning.

On the supply side, the drive accepts 3× 380–500 VAC at 50 to 60 Hz ±5%. At the upper end of that range, it can deliver an apparent power of 8.6 kVA, enough to energize a 4 kW induction motor while maintaining a nominal output current of 9.5 A. The synthesized output frequency may be adjusted from 0.1 to 599 Hz, enabling both low-speed torque and oversynchronous operation. Carrier switching occurs at 4 kHz to balance acoustic noise and switching losses. Internal components are cooled by natural convection, and the enclosure complies with IP20, so it must be mounted inside a protected panel. The housing measures 60 × 325 × 232 mm for vertical stacking in shallow racks. A DC-link chopper can connect to a brake resistor not lower than 36 Ω for emergency stopping, and the power section withstands 5 kA of prospective short-circuit current.

Control electronics draw 24 VDC within a −15% to +20% window and need no more than 1.1 A during steady operation. A brief inrush of 10 A is expected when the DC-link capacitors charge, after which the inverter can tolerate process surges up to 14.3 A for 60 seconds without derating. At nominal load, the heat sink must dissipate 125 W, so cabinet airflow or auxiliary fans may be required to maintain semiconductor temperatures. Stable operation depends on a consistent control supply so the inverter can maintain its commanded output characteristics during dynamic load changes.