Description
Allen-Bradley 1398-DDM-075 | Ultra 200 Servo Drive | 75A Peak
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1398-DDM-075 |
| Product Type | Universal Digital Servo Drive |
| Series | Ultra 200 |
| Main Input Voltage | 100–240 VAC RMS |
| Input Frequency | 47–63 Hz |
| Main Input | 1-phase or 3-phase |
| DC Bus Voltage | 141–339 VDC |
| Peak Output Current | 50 A, 1-phase input / 75 A, 3-phase input |
| Continuous Output Current | 15 A, 1-phase input / 35 A, 3-phase input |
| Peak Power Output | Up to 7.5 kW at 240 VAC, 1-phase; 20 kW at 240 VAC, 3-phase |
| Continuous Power Output | 3.5 kW at 240 VAC, 1-phase; 7.5 kW at 240 VAC, 3-phase |
| Peak Internal Shunt Power | 10 kW |
| Continuous Internal Shunt Power | 50 W |
| Peak External Shunt Power | 10 kW |
| Continuous External Shunt Power | 4 kW |
| Bus Capacitance | 4,290 µF |
| Motor Type | Brushless servo motor applications |
| Control | Microprocessor-based digital servo control |
| Feedback | Motor encoder interface |
| Communications | RS-232 / RS-485 serial interfaces |
| Configuration Software | ULTRA Master |
| Publication | Allen-Bradley 1398-5.0 |
| Manufacturer Status | Discontinued |
The OEM manual specifies a 141–339 VDC bus, 50 A peak / 15 A continuous output for single-phase operation, and 75 A peak / 35 A continuous output for three-phase operation. The 1398-DDM-075 is rated for 100–240 VAC, 47–63 Hz input.
There is an important distinction between the commonly advertised 75 A rating and the drive’s actual operating configuration: the 75 A peak rating applies with three-phase input. For single-phase operation, Allen-Bradley requires the positive and negative current limits to be set to 50 A peak, with a 15 A continuous current limit.
Product Introduction
The Allen-Bradley 1398-DDM-075 is a high-power member of the Ultra 200 Series Digital Servo Drives, designed to control brushless servo motors in machine-motion applications. It combines a digital motion-control processor with power conversion, encoder feedback, analog/digital interfaces, current regulation, velocity control, and position-control functions.
The 1398-DDM-075 is particularly important to identify correctly because its power rating depends on the supply arrangement. With three-phase input, the manual specifies 75 A peak and 35 A continuous output and up to 7.5 kW continuous output at 240 VAC; single-phase operation has substantially lower allowable current limits.
1398-DDM-075
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
A 1398-DDM-075 replacement is not simply a matter of matching the 75 A label. The motor, encoder feedback, input phase configuration, current limits, shunt arrangement, control parameters, and firmware/drive revision all affect whether the replacement will operate correctly.
Typical Applications
- Ultra 200 brushless servo motion systems
- Machine-tool and automated machinery axes
- Industrial positioning and velocity-control applications
- High-power brushless servo motor systems
- Legacy Allen-Bradley motion-control installations
Technical Pitfalls to Avoid
- Do not assume 75 A is the continuous rating.
The 75 A figure is the peak output rating when the drive is operated with three-phase input. The corresponding continuous output rating is 35 A. With single-phase input, the limits fall to 50 A peak and 15 A continuous. - Check whether the existing system uses single-phase or three-phase input.
Allen-Bradley explicitly allows the to operate from either configuration. When single-phase power is used, the manual requires specific current-limit parameters to be changed; failure to make those changes can result in drive malfunction or damage. - Match the with the motor and feedback system.
The Ultra 200 architecture uses encoder feedback and motor-specific configuration data. A replacement drive should be checked against the existing motor catalog number, encoder arrangement, motor file, tuning parameters, and current limits rather than commissioned with default settings. The manual also provides automatic tuning through ULTRA Master, but notes that precise tuning depends on the actual coupled mechanical load. - Do not overlook regenerative energy.
The includes an internal shunt capability and can accept an external shunt resistor. The manual specifies 10 kW peak and 50 W continuous internal shunt power, while the external shunt arrangement is rated up to 10 kW peak and 4 kW continuous. High-inertia axes and rapid deceleration therefore require a careful regeneration assessment.
Related Products
- Allen-Bradley 1398-DDM-030 — Smaller Ultra 200 Universal Digital Servo Drive, approximately 3 kW class.
- Allen-Bradley 1398-DDM-020 — Ultra 200 2 kW-class Universal Digital Servo Drive.
- Allen-Bradley 1398-DDM-010 — Smaller Ultra 200 Universal Digital Servo Drive.
- Allen-Bradley 1398-DDM-075X — Ultra 200 Universal Indexing Drive variant of the .
- Allen-Bradley 1398-DDM-150 — Higher-power Ultra 200 drive rated for three-phase operation.
- Allen-Bradley 1398-HM1-001 — TouchPad operator/configuration accessory for the Ultra 200 family.
- Allen-Bradley 9101-1388 — 55 A continuous single-phase AC line filter associated with /075X applications.
- Allen-Bradley 9101-1389 — 36 A continuous three-phase AC line filter associated with /075X applications.
- Allen-Bradley 9101-1391 — J1-to-50-pin terminal-strip breakout assembly used with the Ultra 200 interface.
Procurement Check
Before approving an Allen-Bradley 1398- replacement, verify:
- Exact model:
- Whether the required unit is or DDM-075X
- Single-phase or three-phase incoming power
- Motor catalog number
- Motor continuous and peak current requirements
- Encoder/feedback type
- Existing motor file and tuning parameters
- ULTRA Master configuration
- Firmware revision
- Regulator-board and power-board revisions
- Internal versus external shunt arrangement
- AC line-filter configuration
- J1/J2 interface cabling
- Existing drive fault history
- Physical mounting and cooling clearances
Recommended procurement description:
Allen-Bradley 1398- Ultra 200 Universal Digital Servo Drive, 75A Peak / 35A Continuous Three-Phase Output, 100–240 VAC Input, 7.5 kW Continuous Three-Phase Power, Brushless Servo Motor Control.
The critical point is that 1398- is a discontinued Ultra 200 servo drive, not a PLC processor. The headline 75 A rating is only the three-phase peak-output condition; for a field replacement, the input phase, continuous current, motor/encoder combination, configuration parameters, and regenerative-load requirements must all be checked before commissioning.
