Description
Product Introduction
The Allen-Bradley 1398-DDM-019 is a compact, high-performance digital AC servo drive from the Ultra 100 series. Designed to deliver precise motion control for brushless AC servo motors (such as Allen-Bradley Y-Series, F-Series, and H-Series motors), it operates on a wide single-phase or three-phase line input range of 100 to 240 VAC.
Equipped with advanced digital signal processing (DSP) hardware, the 1398-DDM-019 handles complex positioning profiles, torque loops, and velocity control directly via digital/analog I/O or serial commands using Ultraware software. Its integrated power supply, internal shunt options, and compact footprint make it a staple in automated packaging, assembly indexing, and precision CNC motion axes.
Key Technical Specifications
| Parameter | Specification |
| Manufacturer Part Number | 1398-DDM-019 |
| Input Voltage Range | 100 to 240 VAC (1-Phase or 3-Phase) |
| Input Frequency | 47 to 63 Hz |
| Continuous Output Current | 7.5 A RMS (0-Peak: 10.6 A) |
| Peak Output Current | 15.0 A RMS (0-Peak: 21.2 A) |
| Continuous Power Output | 1.5 kW |
| Feedback Types Supported | Incremental Encoder with Hall Signals, Sine/Cosine |
| Communication Interface | RS-232 / RS-485 Serial Port (J5 Connector) |
| Operating Temperature | 0°C to 55°C (32°F to 131°F) |
| Configuration Software | GML Commander / Ultraware |
Application Scenarios & The “Trench” Experience
It is 2:45 AM on a high-speed pick-and-place packaging line. An axis controlling the main indexer table throws a solid red status LED with a Drive Memory / Power Stage Fault. The maintenance tech unplugs the pre-wired terminal blocks and feedback cables, drops a pre-tested 1398-DDM-019 onto the panel backplate, connects a serial cable to load the saved .udb parameter file via Ultraware, and brings the indexer back into 100% position synchronization before the morning shift starts.
- Packaging & Labeling Machines – High-Speed Indexing Lines – Delivers rapid acceleration and deceleration ramps for rotary knife and film-feed axes.
- Semiconductor & Electronics Assembly – Precision Pick-and-Place – Maintains sub-micron positioning feedback loops on multi-axis gantries.
- Textile & Converting Machinery – Constant Tension Web Control – Utilizes analog velocity/torque override modes to maintain material web feed rates.
- 1398-DDM-019
- 1398-DDM-019
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on dedicated Allen-Bradley servo test stands.
- Inbound Mechanical & Bus Audit: Visual inspection of DC bus capacitors, terminal strip screws, heatsink fins, and serial port pins.
- High-Voltage Insulation & Diode Test: Megger-tested at 1000 VDC to verify isolation across input line terminals to chassis ground and meter checks on all inverter power transistors.
- Live 230V Power-Up & Pre-Charge Check: Powered with 230 VAC line input; verified internal pre-charge relay timing and DC bus charging voltage (~310 VDC).
- Full-Load Servo Motor Run Test: Connected to an Allen-Bradley Y-Series brushless servo motor; verified encoder tracking, current loop balance, and zero-speed hold stability.
- ESD Protection & Packaging: Cleaned, sealed in heavy static-shielding bags, and packaged inside shock-resistant custom foam crates.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Mind the Single-Phase vs. Three-Phase Derating! While the 1398- supports both single-phase and three-phase 100–240 VAC inputs, operating on single-phase line power at high continuous torque loads increases ripple current on the DC bus capacitors. Ensure your power supply sizing accounts for peak current demands.
- ❗ Backup Drive Parameters Before Swapping! The 1398- stores motor tuning parameters, I/O mapping, and electronic gearing ratios in internal EEPROM memory. Always upload and save the drive configuration file using Ultraware or GML Commander before pulling a unit from service.
- ⚠️ Check External Shunt Resistor Requirements If your application involves high-inertia decelerations, the internal energy absorption of the drive may be exceeded, causing
Overvoltagefaults. Verify whether your panel requires an external passive shunt resistor wired across the DC bus terminals. - ❗ Inspect Grounding and Shielding Connections High-frequency PWM switching in the 1398- can induce noise into adjacent sensor wires. Ensure the motor feedback cable shield is grounded 360 degrees at the drive chassis and keep low-voltage I/O wiring separated from 230V motor power leads.
Frequently Asked Questions (FAQ for Conversion)
Q: What is the difference between 1398- and 1398-DDM-009? A: The 1398- provides a higher power output rating (7.5A continuous / 15A peak) compared to the 1398-DDM-009 (which delivers 2.5A continuous / 7.5A peak).
Q: Can I program the 1398- using studio 5000 / RSLogix 5000? A: Studio 5000 does not configure the internal drive parameters directly. You configure the 1398- using Rockwell’s Ultraware software via the serial port, while the higher-level motion controller (such as a ControlLogix or CompactLogix axis module) sends motion commands via I/O or analog/pulse interface.
Q: Are these drives still manufactured by Rockwell Automation? A: No. The Ultra 100 series (1398 series) has been discontinued by Rockwell Automation. We maintain inventory of high-grade New Surplus (unused plant spares) and fully bench-tested, refurbished original 1398- units.
Q: What warranty comes with this servo drive? A: Every Allen-Bradley 1398- servo drive includes a full 12-month replacement warranty. If the drive experiences power stage failure, encoder feedback errors, or control board faults within one year, we ship an immediate replacement directly from stock.
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