Frequently Asked Questions

Why does the 7.5kW model have the same 11kVA capacity as the 5.5kW model?

The Drive-7.5KW-4 and Drive-5.5KW-4 both utilize 11kVA power capacity but serve different operational profiles. The 7.5kW model delivers higher peak output current (18A vs 13A) for heavier loads and faster acceleration, while the 5.5kW is optimized for efficiency at lower power. The 7.5kW’s 20.5A input current reflects its higher power delivery capability—ideal for high-traffic elevators requiring frequent starts/stops with heavy passenger loads. Both models share the same robust platform architecture.

Is the 18A output sufficient for high-rise elevators with 2.5m/s speed?

Yes. The 18A output current at 7.5kW supports elevator speeds up to 2.5m/s for cabins up to 1500kg in high-rise applications. The closed-loop vector control maintains precise speed regulation across the full height of tall buildings, while the 0 Hz 200% torque ensures smooth starting even with unbalanced loads. For super high-speed applications (3.0m/s+) or capacities exceeding 1500kg, consider the 11kW or 15kW models in the 11LIFT series.

How does the dual CPU architecture improve reliability for 24/7 operations?

The dual CPU design dedicates one processor exclusively to motor control (torque, speed, position) and another to elevator logic communication (door control, safety circuits, group dispatch). This separation prevents communication delays from affecting motor performance during high-traffic periods. If one CPU encounters an anomaly, the other maintains safety supervision. For commercial buildings requiring 24/7 operation, this architecture provides the redundancy and real-time responsiveness critical for minimizing downtime.

Can this 7.5kW inverter handle regenerative energy from heavy descending loads?

Yes. The built-in brake unit handles regenerative energy from the 7.5kW motor during heavy cargo or passenger descent. For applications with exceptionally high regenerative loads (e.g., freight elevators with heavy counterweights or continuous downward traffic), the 11kVA power capacity provides headroom, and external braking resistors can be added if calculated duty cycles exceed internal brake ratings. Our engineers can calculate exact braking requirements based on your load profile.

What encoder types are supported with the removable PG cards?

The removable PG card design supports multiple encoder interfaces including SinCos (1Vpp), TTL (RS422), HTL (push-pull), and resolver inputs—accommodating both legacy induction motor retrofits and modern PMSM gearless installations. Field replacement takes under 5 minutes without removing the main drive, minimizing downtime in critical commercial operations. Specify your motor encoder type when ordering, and we pre-configure the appropriate PG card.