Selecting & Sizing
How do I choose the right ABB drive family (ACS/ACH/ACQ/ACS880)?
Pick by application: ACS (general/machinery), ACH (HVAC, BACnet, fan macros), ACQ (water/wastewater, pump features), ACS880 (industrial high-performance, low-harmonic/AFE options).
What duty class should I use—light/normal/heavy?
Match the load. Light for fans/pumps with low overload; Normal for mixed loads; Heavy for conveyors/mixers with high starting torque. Ensure the drive’s overload current meets the duty.
Do I need a larger kW rating than the motor?
Not usually. Size to motor FLA and required overload; then check ambient/altitude derating, enclosure type, and any braking/harmonic options.
Installation & Integration
What enclosure should I choose—IP20, NEMA 12/IP54, or cabinet?
IP20/chassis for protected panels; NEMA 12/IP54 for dusty plant rooms; cabinetized or engineered panels for harsh or multi-drive systems.
Do ABB VFDs include EMC/harmonic mitigation?
Many models include DC chokes and EMC filtering. For strict THDi limits or weak grids, select Ultra-Low Harmonic (ULLH/AFE) variants or add external filters.
Performance, Protection & Lifecycle
Do these drives support functional safety (STO)?
Many ABB drives (e.g., ACS580/ACS880/ACH580/ACQ580) include STO (SIL 3) as standard or option. Check the specific model.
What about braking and fast stopping?
Most ranges offer a brake chopper (built-in or optional). Add a brake resistor when rapid decel is required.
How do I extend drive life?
Keep ambient within spec, maintain airflow, follow cable/EMC practices, back up parameters, and schedule fan/capacitor checks per the maintenance schedule.