Indramat MKD025A-144-KP0-KN AC Servo Motor R911281879
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Product Information
The Indramat MKD025A-144-KP0-KN (part number R911281879) is an AC synchronous permanent-magnet servo motor built for high-dynamic motion control in automated production machinery. Manufactured under the Bosch Rexroth product umbrella, this compact motor delivers a continuous standstill torque of 0.9 Nm with a rated current of 2.5 A, a peak torque of 3.8 Nm, and a peak current of 11.3 A. Featuring a 3-pole-pair design, a torque constant of 0.38 Nm/A, and a low rotor moment of inertia of 0.00003 kg·m², the unit is rated for operation up to 6000 rpm and can attain maximum operating speeds of 9000 rpm. Mechanically, it features a DIN 6885-1 keyed drive shaft equipped with an integrated shaft sealing ring to restrict fluid and particle entry, and is configured without an internal holding brake.
Interfacing the MKD025A-144-KP0-KN with drive electronics relies on an optical multiturn absolute encoder utilizing the EnDat feedback protocol. The encoder incorporates an electronic nameplate memory module that stores all motor parameter constants directly on the motor assembly. When connected to compatible Indramat ECODRIVE or Bosch Rexroth IndraDrive controllers, the controller automatically reads the motor parameters upon initial startup, eliminating manual parameter entry and streamlining replacement setup. ABC Industrial Parts can support technical teams with fully tested spare units to maintain continuous operating compatibility on established production lines.
Diagnostics for the MKD025A-144-KP0-KN are handled through the feedback connection to the associated drive controller. Integrated NTC or PTC thermal sensors inside the motor windings continuously relay winding temperature status, allowing the drive to monitor thermal thresholds and prevent damage. Because the motor relies on a brushless permanent-magnet structure and sealed components, routine internal motor maintenance is not required. In the event of internal winding faults, mechanical bearing degradation, or feedback optical errors, board- or component-level repairs are not field-serviceable, making unit exchange or replacement the standard solution to restore system operation.
Technical Specifications
| Manufacturer | Bosch Rexroth / Indramat |
| Part Number | R911281879 |
| Model Designation | MKD025A-144-KP0-KN |
| Component Type | AC Servo Motor |
| Product Family | MKD Synchronous Motors |
| Continuous Torque at Standstill | 0.9 Nm |
| Continuous Current at Standstill | 2.5 A |
| Maximum Torque | 3.8 Nm |
| Peak Current | 11.3 A |
| Rated Speed | 6000 rpm |
| Maximum Speed | 9000 rpm |
| Torque Constant | 0.38 Nm/A |
| Voltage Constant | 23.5 V/1000min-1 |
| Rotor Moment of Inertia | 0.00003 kg·m² |
| Number of Pole Pairs | 3 |
| Shaft Type | Keyed shaft with sealing ring (DIN 6885-1) |
| Holding Brake Option | None |
| Encoder Type | Multiturn optical encoder (EnDat interface) |
| Thermal Protection | Integrated NTC/PTC temperature sensor |
Programming and Configuration
Parameter configuration for the Indramat MKD025A-144-KP0-KN relies on an embedded memory chip located within the optical multiturn encoder. Essential operating parameters—including continuous current ratings, peak current capabilities, voltage constants (23.5 V/1000min-1), and torque constants (0.38 Nm/A)—are permanently stored inside this electronic nameplate.
When connected to a compatible Indramat ECODRIVE or Rexroth IndraDrive drive controller, the drive reads the identification and parameter dataset directly over the EnDat protocol interface upon startup. This plug-and-play functionality reduces setup complexity, removes the need for manual parameter commissioning via drive programming tools, and prevents operational mismatches.
Communication and System Integration
System integration of the MKD025A-144-KP0-KN involves connecting power cables and an integrated feedback cable to the associated drive unit. The primary communication channel uses an optical multiturn encoder utilizing the EnDat interface protocol, providing high-resolution absolute position tracking across multiple motor revolutions.
Alongside absolute position feedback, the feedback cable transfers continuous thermal status from internal NTC or PTC temperature monitoring devices to the host controller. This feedback connection allows Indramat ECODRIVE and Rexroth IndraDrive platforms to accurately govern motor commutation, control positioning loops, and execute thermal fault protection routines.
Diagnostics and Status Indication
The MKD025A-144-KP0-KN does not contain physical indicator LEDs or external displays. Operational diagnostics are performed via the controlling drive software and host controller status registers, which monitor optical encoder signal integrity, EnDat feedback data validity, and winding temperature.
When temperature thresholds are exceeded or feedback signals are interrupted, the connected drive generates specific fault alerts. Standard initial troubleshooting procedures include inspecting feedback cable connections, checking for physical wear or contamination around the shaft sealing ring, and monitoring controller event logs.
Replacement and Spare Part Considerations
When sourcing a replacement motor, verify that both the full model code (MKD025A-144-KP0-KN) and part number (R911281879) match the existing installed unit. Essential mechanical attributes must align, specifically the DIN 6885-1 keyed drive shaft, shaft sealing ring, multiturn EnDat optical encoder option (code K), and the unbraked specification (code 0).
Although the MKD motor family is officially discontinued by Bosch Rexroth and superseded by the MSK motor family, swapping to a newer family typically involves drive firmware, physical mounting, or cabling revisions. Replacing a faulty unit with a tested, identical MKD motor maintains direct plug-and-play hardware and software compatibility. ABC Industrial Parts can assist in supplying operational replacement components to avoid system modification.
Frequently Asked Questions
Which drive controllers are compatible with the MKD025A-144-KP0-KN?
The MKD025A-144-KP0-KN is compatible with Indramat ECODRIVE drive controllers and Bosch Rexroth IndraDrive drive controllers.
How are motor parameters loaded during motor replacement?
Parameters are transferred automatically via an integrated electronic nameplate stored inside the EnDat optical multiturn encoder. Compatible drives read these parameters on power-up without requiring manual entry.
Does this motor model include an internal holding brake?
No, the MKD025A-144-KP0-KN is specified without an internal holding brake (brake option code 0).
What shaft design is present on the MKD025A-144-KP0-KN?
The motor features a keyed shaft according to DIN 6885-1, equipped with an integrated shaft sealing ring to prevent liquid and particle ingress.
What is the successor series for the legacy MKD motor line?
The legacy MKD motor series has been superseded by the Bosch Rexroth MSK motor family.
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Specific firmware and hardware versions
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Disclaimer:
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