ACS 1000 variable speed drives reduce downtime and increase conveying capacity of bauxite mine.
This case note describes how Malarenergi AB replaced resistor‑based slip‑ring motor control with four ABB ACS 1000 variable speed drives to improve the efficiency of its district heating plant. The drives, each rated at 1765 kW, were installed together with new motors and transformers, enabling automatic control of pump pressure.
The installation resulted in a significant reduction of heat losses, an estimated additional 35 GWh of electricity per year, lower CO₂ emissions, more stable pressure in the heating network, and reduced maintenance costs. Customer feedback highlights the improved plant performance and satisfaction with ABB’s technical support.
| Rated power per drive | 1765 kW (2365 hp) |
|---|---|
| Output voltage options | 2.3 kV, 3.3 kV, 4.0 kV, 4.16 kV (optional 6.0‑6.6 kV with step‑up transformer) |
| Motor type | Induction motor |
The plant’s efficiency improvement added about 35 GWh of electricity per year.
The drives can be configured for 2.3 kV, 3.3 kV, 4.0 kV, 4.16 kV, or optionally 6.0‑6.6 kV with a step‑up transformer.