In mining, a stopped motor can disrupt an entire process. Dust, high altitudes and demanding loads make drive selection critical to keeping production moving.
AT24 SD-UD is a low-voltage variable frequency drive (VFD) developed for mining and mineral processing. Combining protected electrical components, heat exchanger cooling and advanced induction motor control, it addresses the conditions that make reliable operation challenging.
Protection built around mining conditions
AT24 SD-UD houses its electrical components in a NEMA 4-rated control cabinet, paired with a separate NEMA 3R cooling cabinet.
A forced-air heat exchanger provides cooling while supporting the protective enclosure design. Convenient cooling-system access helps maintenance teams service the equipment, bringing dust resistance, thermal management and serviceability together in one solution.
Rated power at altitudes up to 4,500 m
AT24 SD-UD supports operation at up to 4,500 m above sea level at rated power, making it an option for demanding high-altitude mining sites.
Its ambient temperature range is −10°C to +40°C without derating, with operation up to +50°C subject to power reduction. These defined limits help engineers match the drive to actual site conditions.
Explore the AT24 SD-UD mining drive for its design and operating capabilities.
Motor control matched to the process
AT24 SD-UD supports open-loop vector, closed-loop vector and scalar V/f control. Closed-loop specifications include speed accuracy of ±0.1% of rated speed and torque accuracy of ±5% of rated torque.
Its control functions include:
- Master-slave operation for mechanically coupled induction motors.
- Catch-on-the-fly functionality for coasting motors.
- Motor autotuning with or without rotation.
- Kinetic buffering, supply-voltage dip handling and partial-power operation.
For demanding loads, its heavy-duty overload capability allows 150% of rated output current for 60 seconds, giving engineers flexibility to address the application’s operating requirements.
Practical integration and maintenance
A built-in Wi-Fi web interface provides drive access, while RS-485 with Modbus RTU supports control-system integration. Configurable digital and analog I/O accommodates application-specific signals and feedback.
A dedicated terminal compartment provides connection access, and an integrated transformer supplies the control and cooling systems.
The floor-mounted cabinet uses bottom cable entry and requires four-side maintenance access, which should be considered during installation planning.
AT24 SD-UD technical specifications
| Parameter | Specification |
|---|
| Rated input | Three-phase 460 V, −15% to +10%; 60 Hz, ±5% |
| Output frequency | 0-400 Hz |
| Heavy-duty overload | 150% of rated output current for 60 seconds |
| Drive efficiency | Up to 98% |
| Cabinet protection | NEMA 4 control cabinet; NEMA 3R cooling cabinet |
| Cooling | Forced air with heat exchanger |
| Operating altitude | Up to 4,500 m at rated power |
| Ambient temperature | −10°C to +40°C without derating; up to +50°C with power reduction |
| Communication | RS-485, Modbus RTU and built-in Wi-Fi web interface |
Frequently asked questions
What makes AT24 SD-UD suitable for mining?
Its dust-resistant design combines protected electrical components, heat exchanger cooling and motor-control functions for demanding mining and mineral processing environments.
Can AT24 SD-UD operate outdoors?
Yes. The catalogue specifies indoor and outdoor installation within the stated environmental limits and installation requirements.
Does high-altitude operation require power reduction?
AT24 SD-UD is specified for operation up to 4,500 m above sea level at rated power.
Find the right configuration for your mining operation
Start with your motor data, load profile, site altitude and ambient temperature. Triol’s team can help evaluate an AT24 SD-UD configuration around your operating requirements.
Discuss your mining application with Triol
