Schneider ATS48C59Q Soft Starter: High-Performance Motor Control for Industrial Applications

The Schneider ATS48C59Q is a premium soft starter from the Altistart 48 series, engineered to deliver precise, reliable control for asynchronous (induction) motors in demanding industrial environments. Designed to minimize mechanical stress, reduce inrush current, and protect motors during startup, it is a cornerstone solution for applications requiring smooth, controlled acceleration.

Core Functionality

As a thyristor-based soft starter, the ATS48C59Q regulates voltage during motor startup by adjusting the conduction angle of three-phase anti-parallel thyristors. This gradual voltage ramp-up eliminates abrupt current surges (typically limiting inrush current to 2–4× rated current), reducing mechanical shock on motors, gears, belts, and connected loads (e.g., pumps, fans, conveyors). It also integrates advanced protection features to safeguard motors from damage, including:

• Overload protection (thermal monitoring for motors and starters)
• Phase failure detection (line-side)
• Short-circuit and thermal overload protection

Technical Specifications

Key Applications

The ATS48C59Q is optimized for heavy-duty industrial scenarios where controlled startup is critical to equipment longevity, including:

• Pumps and pumping stations: Prevents water hammer and pipe stress.
• Ventilation/HVAC systems: Reduces belt/bearing wear in fans and blowers.
• Conveyors and material handling: Minimizes mechanical shock on drive chains and rollers.
• Compressors and industrial machinery: Avoids voltage dips in power grids during startup.
• Centrifugal machines: Ensures smooth acceleration for centrifuges or mixers.

Differentiation from Variable Frequency Drives (VFDs)

Unlike VFDs—which adjust both voltage and frequency for speed control—the ATS48C59Q focuses solely on voltage regulation during startup/shutdown. It is a cost-effective solution for applications requiring only smooth acceleration/deceleration, not continuous speed variation. While VFDs offer broader functionality, soft starters like the ATS48C59Q excel in simplicity, reliability, and lower upfront costs for fixed-speed systems.

Installation and Maintenance

• Mounting: Designed for vertical installation (±10° tolerance) with forced convection cooling. Recommended clearance ensures optimal heat dissipation.
• Wiring: Connects directly to the motor supply line (delta terminals for higher current applications).
• Commissioning: Configurable via local keypad (sold separately) or PC software, with adjustable startup ramp times, current limits, and protection thresholds.
• Maintenance: Periodic inspection of thyristor modules, cooling systems, and electrical connections is advised to ensure long-term reliability.