Product Overview

The 1398-DDM-005​ is a compact, high-performance digital servo drive from the Allen‑Bradley Ultra 100 series, manufactured by Rockwell Automation. Designed for single-axis precision motion control, this model accepts a universal 100–240 VAC single-phase input and delivers a continuous output of 2.5 Arms (0.5 kW / 500 W @ 240 VAC) with a peak current of 7.5 A for acceleration demands. The 1398-DDM-005​ is a full digital drive capable of operating in torque, velocity, and position control modes, and includes an integrated indexing function that allows stand-alone point-to-point moves without a separate motion controller—making it ideal for OEM machines and retrofit applications where simplicity and compactness are paramount.As part of the Ultra 100 platform, the 1398-DDM-005​ communicates with Allen‑Bradley servo motors (such as the Bulletin 1326 or legacy Ultra 100 motor lines) via a high-resolution incremental encoder feedback interface, supporting 2,000 to 2,500 line encoders with differential A/B/Z inputs and marker/index pulse processing. The drive features an RS‑232/RS‑485 port for configuration using Rockwell Software’s UltraWARE, and accepts analog ±10 V speed/torque references as well as step-and-direction pulse trains for drop-in replacement of stepper-based systems. With programmable acceleration/deceleration ramps, multiple homing methods, electronic gearing/emulation capability (via indexer option), and comprehensive on-board fault diagnostics shown on a two-line alphanumeric LED display, the 1398-DDM-005​ provides an accessible yet powerful motion solution for packaging, converting, semiconductor handling, and general automation equipment. For plants maintaining legacy Allen‑Bradley servo systems, sourcing a verified 1398-DDM-005​ ensures continued operation of critical single-axis stations without a full controls overhaul.

Technical Specifications

Product Model	1398-DDM-005
Manufacturer	Allen‑Bradley / Rockwell Automation
Product Type	Ultra 100 Series Digital Servo Drive (Single-Axis, Indexer-capable)
Input Voltage	100–120 VAC / 200–240 VAC, 1‑Phase, 50/60 Hz (auto‑ranging)
Continuous Output Current	2.5 Arms (0.5 kW / 500 W @ 240 VAC input)
Peak Output Current	7.5 Arms (for acceleration / deceleration periods, limited by time & thermal model)
DC Bus Voltage (nominal)	~170 VDC @ 120 VAC in; ~340 VDC @ 240 VAC in
Feedback Interface	Incremental encoder: A, /A, B, /B, Z, /Z (differential RS‑422 levels); 2,000–2,500 lines typical; also supports marker / commutation track on some motors
Control Modes	Torque (Current), Velocity, Position (Step/Dir or Indexer), Jog, Homing
Command Interfaces	±10 V analog in (velocity or torque), Step + Direction pulses (up to 500 kHz typ.), CW/CCW pulse pair; RS‑232/485 for UltraWARE programming
Digital I/O	Multiple optically isolated inputs (Enable, Fault Reset, Home, Jog ±, Index Trigger) and outputs (Ready, Fault, In‑Position / At‑Speed)
Ambient Operating Temp	0 °C to +55 °C (derated above 40 °C per manual), Storage: –40 °C to +85 °C
Dimensions (H×W×D)	Approx. 225 × 70 × 185 mm (8.86 × 2.76 × 7.28 in)
Weight	Approx. 1.7 kg (3.7 lb)
Protection / Certifications	Over‑current, over‑voltage, under‑voltage, over‑temperature, short‑circuit, encoder loss detection; UL, cUL, CE marked

 

Main Features and Advantages

Full digital three‑loop control with auto‑tuning: The 1398-DDM-005​ implements digital current (torque), velocity, and position loops with 16‑bit resolution on command inputs. Rockwell’s auto‑tune routine excites the motor mechanically to identify inertia and friction, then sets PI gains automatically—dramatically reducing commissioning time versus manual tuning. For advanced users, manual gain adjustment, feed‑forward (velocity & acceleration), and notch‑filter settings are accessible through UltraWARE, letting the 1398-DDM-005​ be fine‑tuned for low‑overshoot settling on delicate load‑handling axes.Built‑in indexer for stand‑alone motion: A key differentiator of the 1398-DDM-005​ is its onboard indexer memory (when the indexer option is present on the DDM suffix—standard on most DDM‑005 units). Up to 63 positions / sequences can be stored and triggered by discrete inputs or serial commands, enabling simple pick‑and‑place, cut‑to‑length, or rotary indexing without a PLC‑based motion card. This lowers total system cost and simplifies machine architecture for single‑axis OEM designs.Flexible command acceptance—step/direction & analog: The 1398-DDM-005​ can accept step‑and‑direction pulses (TTL or differential) making it a direct upgrade from open‑loop stepper drives while delivering closed‑loop servo performance with stall detection and position error reporting. Alternatively, it accepts ±10 V analog for velocity or torque mode when slaved to an analog motion controller or PLC analog output. This multi‑mode compatibility lets the 1398-DDM-005​ fit into both new designs and legacy retrofit panels with minimal rewiring.Comprehensive diagnostics and protection: A two‑line alphanumeric LCD on the front of the 1398-DDM-005​ displays real‑time status (Enable, Fault Code, Bus Voltage, Motor RPM, Following Error) in plain text. Integrated protections guard against over‑current (shoot‑through or shorted motor leads), over‑temperature (heatsink thermal sensor), DC‑bus over/under‑voltage, and loss of encoder feedback—latching a fault and disabling output until reset. The drive’s Status and Fault TTL‑compatible outputs can be wired to a PLC or stack‑light for immediate operator notification.Compact panel‑mount form factor with global approvals: The 1398-DDM-005​ mounts on a standard 35 mm DIN rail or directly to the panel backplate using two bottom tabs, occupying minimal width (70 mm) in the enclosure. Its universal input voltage eliminates the need for a step‑down transformer in most global installations. UL, cUL, and CE markings facilitate machinery export compliance.

Application Field

The 1398-DDM-005​ is most commonly applied on individual motion axes where precise positioning, repeatable velocity control, or controlled torque is required but a full multi‑axis CNC or PAC‑based motion controller is not justified. In packaging machinery—such as form‑fill‑seal (FFS) equipment, cartoners, and label applicators—the 1398-DDM-005​ drives cutoff knives, rotary turrets, and product‑push arms, using its indexer to execute recipe‑based position changes triggered by photo‑eye or registration mark. The ability to accept step pulses lets OEMs retain existing pulse‑train logic from earlier stepper designs while gaining servo stiffness and loss‑of‑step detection.In semiconductor back‑end equipment and electronics assembly, the 1398-DDM-005​ controls small X/Y/Z stages for component placement heads or wafer‑handler rotary index tables, where the encoder feedback loop guarantees positional integrity that open‑loop steppers cannot provide. Converting machinery (web‑guiding nip rolls, flying‑shear pull‑rolls) benefits from the drive’s velocity mode with analog trim from a dancer arm or load cell, while the 1398-DDM-005‘s torque mode can be used for controlled winding tension on take‑up reels. Test stands and laboratory instruments also employ the 1398-DDM-005​ for precise small‑motor characterization or actuator positioning thanks to its fine resolution and easy PC‑side configuration via UltraWARE.When deploying the 1398-DDM-005, verify that the connected servo motor’s winding voltage and continuous current are compatible with the 2.5 A continuous / 7.5 A peak ratings; oversized motors will saturate the drive or trigger current‑limit faults. For overhauling loads or frequent heavy braking, consider adding an external regen resistor to the DC bus terminals if the application’s kinetic energy return exceeds the drive’s internal dissipation capacity. In all cases the 1398-DDM-005​ should be installed in a ventilated enclosure with adequate spacing above/below the heatsink to maintain ambient within the 0–55 °C rating.

Related Products

• 1398-DDM-009​ — Ultra 100 digital servo drive, 0.9 kW (900 W) continuous / 4.5 A rating; step up from the 1398-DDM-005​ when motor current exceeds 2.5 A.
• 1398-DDM-019​ — 1.9 kW (1.9 kW) Ultra 100 drive, ~9 A continuous; for larger single‑axis servo motors in the same Ultra 100 family.
• 1326AB-B520E-21 / 1326AB-B740E-21​ — Allen‑Bradley 1326 series low‑inertia servo motors commonly paired with the 1398-DDM-005; check winding voltage and encoder type compatibility.
• 1398-4CM / 1398-4SM / 1398-RLY​ — Accessory communication or I/O expansion modules / cable kits for the 1398 series; may be required depending on your control interface to the 1398-DDM-005.
• UltraWARE Configuration Software (Legacy)​ — Rockwell Software package used to commission, tune, back‑up parameters, and monitor the 1398-DDM-005​ via RS‑232/485.
• Kinetix 300 / Kinetix 5100 (2098-DSD-005)​ — Modern Rockwell servo drive families that succeed the Ultra 100 line for new designs; the 1398-DDM-005​ remains the preferred direct replacement for maintaining existing Ultra 100 installations.
• 2098-DSD-005-SE​ — Legacy/obsolete Kinetix 6000 single‑axis servo drive; sometimes cross‑referenced in migration notes though not a plug‑in replacement for the 1398-DDM-005​ without rewiring.