Description
Product Introduction & Engineering Value
Machine builders often discover that replacing a failed servo drive is only part of the repair. Motion profiles, encoder feedback, and indexing parameters must also match the original system. The Allen-Bradley 1398-DDM-009X was designed to simplify this by combining a digital servo amplifier with an integrated indexing controller.
As a member of the Ultra 100 family, the drive supports point-to-point positioning, velocity control, electronic gearing, and programmable indexing. It is commonly found in legacy packaging equipment, labeling machines, conveyors, and automated assembly systems where reliable single-axis motion remains essential.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1398-DDM-009X |
| Product Family | Ultra 100 |
| Product Type | Digital Indexing Servo Drive |
| Rated Output Power | 1 kW (1.5 HP) |
| Input Voltage | 100–240 VAC, Single Phase |
| Input Frequency | 47–63 Hz |
| AC Input Current | 9 A rms |
| DC Bus Voltage | 141–339 VDC |
| Continuous Output Current | 5 A |
| Peak Output Current | 15 A |
| Peak Output Power | 1.3 kW @ 120 VAC / 2.7 kW @ 240 VAC |
| Communication | RS-232 Serial |
| Encoder Interface | 5 VDC Incremental Encoder |
| Operating Temperature | 0°C to +55°C |
| Enclosure | NEMA 12 |
Field Application & The “Trench” Experience
A pharmaceutical packaging line began rejecting cartons because the product insertion arm occasionally stopped a few millimeters short of its programmed position. The servo motor, coupling, and encoder all tested within specification, and no mechanical binding was found.
Engineers connected to the 1398-DDM-009X through its RS-232 port and observed intermittent drive faults during high acceleration. Installing a replacement drive and restoring the original indexing parameters immediately returned positioning accuracy to specification. No PLC modifications were required.
Typical application scenarios include:
- Cartoning and packaging machinery
- Rotary indexing tables
- Labeling and printing systems
- Electronic component assembly equipment
- Small CNC positioning systems
Transparency SOP: QA & Testing
Every New Surplus or professionally Refurbished 1398-DDM-009X is verified before shipment through a documented inspection process.
- Confirm catalog number, hardware series, and product identification.
- Inspect power semiconductors, capacitors, cooling assembly, and connectors.
- Perform insulation resistance and DC bus verification.
- Test RS-232 communication using Ultra Master software or compatible serial commands.
- Verify encoder feedback processing and digital I/O operation.
- Run the drive with a compatible servo motor through multiple indexing profiles.
- Package using ESD-safe materials with complete traceability records.
- 1398-DDM-009X
- 1398-DDM-009X
The Veteran’s Tech Trap Guide
⚠️ Always save the motion program before replacing the drive. The 1398- can store indexing profiles internally. Installing a replacement without backing up parameters may require complete motion reconfiguration.
⚠️ Check the encoder cable before condemning the drive. Noise, broken conductors, or loose encoder connectors often generate following errors and positioning faults that resemble amplifier failures.
PRO TIP: Measure the incoming AC supply under full machine load. Voltage drops during acceleration can trigger undervoltage faults even when the servo drive is operating correctly.
PRO TIP: Replace aging electrolytic capacitors during preventive maintenance if the machine has operated continuously for many years. Many Ultra 100 failures originate in the DC bus power section rather than the control electronics.
Dynamic FAQ
Q1. What is the primary function of the 1398-?
The is a 1 kW Ultra 100 digital servo drive with integrated indexing capability. It controls servo motor position, speed, and torque for single-axis motion applications.
Q2. What power supply does the drive require?
The drive operates from a 100–240 VAC single-phase power source at 47–63 Hz.
Q3. Does the 1398- support standalone positioning?
Yes. The integrated indexing controller allows the drive to execute stored positioning profiles without requiring continuous PLC motion commands, making it suitable for standalone indexing applications.
Q4. Which communication interface is available?
The drive includes an RS-232 serial communication port for configuration, diagnostics, and programming using Ultra Master software or compatible serial host commands.
Q5. How is New Surplus authenticity verified?
Every unit undergoes catalog number verification, hardware inspection, encoder interface testing, power-stage evaluation, communication testing, and functional motor operation before shipment.
Q6. Is the 1398- still manufactured?
No. The Ultra 100 family has been discontinued by Rockwell Automation. The 1398- is typically available through New Surplus, professionally Refurbished, or certified repair channels to support legacy motion control systems.
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