Product Overview

The Allen-Bradley 1398-DDM-075 is a high-performance microprocessor-based digital servo drive from the legacy Ultra 200 series, engineered to provide precise torque, speed, and position control for brushless AC servo motors in demanding industrial automation applications. It accepts a wide-range universal AC input of 100–240 VAC at 47–63 Hz, supporting both single-phase and three-phase operation, which makes it highly adaptable to various global power infrastructures. The unit delivers a continuous output power of 7.5 kW (10 HP) with robust overload capabilities, making it a core component for complex motion control systems.The drive features an internal shunt regulator with a bus voltage range of 141–339 VDC and a large bus capacitance of 4290 µF, ensuring stable DC bus performance during dynamic acceleration and deceleration cycles. For system integration, the 1398-DDM-075 comes equipped with a standard SERCOS interface, allowing seamless real-time communication and networking with Rockwell Automation Logix-series programmable automation controllers.

Technical Specifications

• Product Model: 1398-DDM-075
• Manufacturer: Allen-Bradley / Rockwell Automation
• Product Type: Universal Digital Servo Drive
• Series: Ultra 200
• Input Voltage: 100–240 VAC rms (±10%), Single or Three-Phase
• Input Frequency: 47–63 Hz
• DC Bus Voltage: 141–339 VDC
• Continuous Output Current: 15 A (Single-phase) / 35 A (Three-phase)
• Peak Output Current: 50 A (Single-phase) / 75 A (Three-phase)
• Continuous Output Power: 7.5 kW (Three-phase)
• Peak Output Power: 14 kW (Single-phase) / 20 kW (Three-phase)
• Bus Capacitance: 4290 µF
• Power Dissipation: 300 W
• Control Mode: Closed-loop Vector Control (Torque, Velocity, Position)
• Speed Range: 0–6000 rpm
• Position Accuracy: ±0.001°
• Digital Inputs: 5 user-configurable + 1 fixed ENABLE (24V DC, optically isolated)
• Digital Outputs: 4 assignable sourcing + 2 dedicated relay outputs (Brake, Drive Ready)
• Analog I/O: Two 0–10V inputs (10-bit); Two ±10V outputs (12-bit & 8-bit)
• Communication: SERCOS interface
• Protection Features: Overload, overvoltage, undervoltage, overheating, short-circuit protection
• Enclosure Rating: IP20
• Cooling Method: Forced air cooling
• Dimensions: 14.2 × 5.97 × 8.84 inches (360.6 × 151.7 × 224.5 mm)
• Weight: Approx. 9.7 kg (21.32 lbs)
• Operating Temperature: 0°C to 55°C

Main Features and Advantages

• Flexible Power Input and High Peak Current: The 1398-DDM-075 can operate on either single-phase or three-phase AC input, offering installation flexibility. Its ability to deliver up to 75 A peak current (three-phase) provides the high dynamic response necessary for handling rapid acceleration and heavy transient loads.
• Advanced Vector Control: Utilizing sophisticated vector control algorithms, the drive achieves exceptional precision with a position accuracy of ±0.001° and a wide speed control range up to 6000 rpm. This ensures smooth motor operation even at very low speeds.
• Comprehensive I/O and Communication: Standard integration is handled via the SERCOS interface for deterministic control network performance. Additionally, the onboard suite of optically isolated digital I/O and high-resolution analog channels allows for direct connection to various sensors and limit switches without requiring extra expansion modules.
• Robust Protection Mechanisms: The drive includes extensive self-protection logic, monitoring for conditions such as overcurrent, overvoltage, and overheating. It also features specific motor overload protection that activates within 8 minutes at 200% overload or within 20 seconds at 600% overload, safeguarding expensive motor assets.