Yaskawa Electric Corporation Z1B1B021PM Variable Frequency Drive

The Yaskawa Electric Z1B1B021PM is a Z1000 Bypass Variable Frequency Drive (VFD) that provides precise motor speed control and intelligent bypass capability for HVAC and industrial motor control applications. Designed for 480 VAC, 3‑phase systems, this 15 HP drive delivers adjustable output from 0.01 to 240 Hz and draws about 21 to 21.2 A, with a 50/60 Hz capability and 3‑phase input. Enclosed in a NEMA 1 / IP20 housing, it is intended for wall or panel mounting in industrial environments. It uses V/Hz and Open Loop Vector control for speed regulation and features an Intelligent 2‑Contactor Bypass to maintain process continuity during maintenance or fault conditions. The Z1B1B021PM is widely employed in pumps, fans, air handling units, cooling towers, compressors, and other industrial ventilation equipment, and is used for repair, retrofit, or replacement of Z1000 bypass VFD systems within building automation and energy‑saving HVAC deployments. Communications options include embedded BACnet, Modbus/MEMOBUS, Metasys, and APOGEE FLN, enabling integration with broader control networks. This legacy Z1000 Bypass drive aligns with Yaskawa’s focus on building automation and energy‑efficient HVAC, and is commonly found in surplus or replacement markets, with replacements such as GA800, CIMR‑ZU4A0021FAA, and Z1B1B018PMG listed as nearby equivalents.