Kollmorgen PRD-P310250E-55 ServoStar SP Servo Drive

Description

Product Introduction & Engineering Value

The PRD-P310250E-55 belongs to Kollmorgen’s older ServoStar SP motion-control platform. Its job is straightforward but application-critical: convert incoming AC power into controlled three-phase motor power while responding to the machine’s motion-command and feedback architecture.

For a legacy CNC, machine-tool, robotics, or automated production system, the exact ServoStar configuration matters. The available documentation and supplier references consistently associate PRD-P310250E-55 with CP310250, so both identifiers should be included on an RFQ.

Technical Specifications

Available supplier documentation describes the PRD-P310250E-55 as a ServoStar SP drive with three-phase AC input, 0–400 Hz output capability, IP20 protection, fan-assisted cooling, and operation up to 3,000 m with derating above 1,000 m.

Specification caution: The online secondary sources contain contradictory electrical ratings for this exact model. One source describes the unit as a 2 kVA / 3 A drive while the same page also gives 4.6 kVA input, 3.5 kVA output, and 13 A/phase input values. Because of this inconsistency, the exact input/output current and kVA rating should be verified from the drive nameplate or original Kollmorgen documentation before procurement.

Field Application & the “Trench” Experience

A machine-tool builder had an older servo-controlled axis operating reliably for years. The mechanical system was fine, the motor feedback was healthy, and the controller was still running its original application. The failure was isolated to the ServoStar drive.

The maintenance team found PRD-P310250E-55 on the failed amplifier and also identified CP310250 in the machine documentation. Rather than replacing the entire motion-control system, they sourced a matching drive and compared the model marking, connector arrangement, feedback interface, and configuration before installation.

After the replacement, the axis was tested first at low speed, then through its normal acceleration and positioning sequence. The machine returned to service without changing the established controller architecture.

Specific application scenarios

• CNC machine-tool servo axes
• Automated positioning mechanisms
• Legacy robotic motion systems
• Precision material-handling equipment
• Multi-axis production machinery
• Older ServoStar SP-based OEM machines

The PRD-P310250E-55 is specifically listed alongside CP310250 in industrial automation inventories and Kollmorgen ServoStar SP product references.

PRD-P310250E-55

PRD-P310250E-55

Transparency SOP: QA & Testing

For a New Surplus or Refurbished PRD-P310250E-55, the test should cover both the power stage and the control interface.

1. Identification

• Verify on the nameplate.
• Cross-check CP310250 where applicable.
• Record hardware revision and serial number.
• Photograph connectors and terminal markings.

2. Physical inspection

Inspect the power terminals, control connectors, cooling fan, heat sink, PCB, capacitors, and mounting points. Any evidence of excessive thermal stress deserves further evaluation.

3. Power-stage test

Using an appropriate controlled test setup:

• Verify input power behavior.
• Check DC-bus charging.
• Confirm output switching.
• Test three-phase motor output.
• Monitor abnormal current and temperature.

4. Motion test

Where the compatible motor and feedback equipment are available, test low-speed rotation, direction, acceleration, deceleration, and positioning response.

A “powers on” test is not sufficient for a servo amplifier. The output stage and feedback/control interface should both be checked.

The Veteran’s Tech Trap Guide

⚠️ Trap 1: Buying based on CP310250 alone

The CP310250 identifier appears alongside several different PRD variants in supplier inventories, including PRD-P310250D-55, PRD-P310250E-55, and PRD-P310250Z-55.

PRO TIP: Quote the complete number, not simply “CP310250.”

⚠️ Trap 2: Trusting a reseller’s current electrical specification without verification

There are conflicting online specifications for this exact model. One listing simultaneously presents 2 kVA/3 A and higher input/output figures.

For a production replacement, use the nameplate and original machine documentation as the final authority.

⚠️ Trap 3: Forgetting motor-feedback compatibility

A servo amplifier is part of a closed-loop motion system. The motor, feedback device, controller, and drive must agree.

Do not substitute another ServoStar model merely because its power rating appears similar.

⚠️ Trap 4: Ignoring the cooling fan

The available PRD-P310250E-55 documentation describes a ventilated, fan-cooled enclosure.

A replacement fan that starts intermittently—or a cabinet with restricted airflow—can turn an apparently healthy refurbished drive into a repeat failure.

Dynamic FAQ

Q1. What is the Kollmorgen PRD-P310250E-55?

It is a Kollmorgen ServoStar SP AC servo drive/servo amplifier, associated with the model designation.

Q2. What is the equivalent CP model?

The PRD-P310250E-55 is commonly listed as .

Q3. Is PRD-P310250E-55 a servo motor?

No. It is the servo drive/amplifier. It supplies controlled motor power and operates as part of a closed-loop motion-control system.

Q4. What should I verify before purchasing?

Verify the complete number, CP310250 cross-reference, hardware revision, input/output ratings, motor compatibility, feedback interface, connectors, and existing controller configuration.

Q5. Is New Surplus or refurbished stock available?

Yes. Current industrial automation suppliers list the PRD-P310250E-55 in legacy-spare inventories, including new/surplus and refurbished sourcing channels.

For critical equipment, request the actual nameplate photograph, serial number, functional test report, condition classification, and written warranty before purchasing.

Q6. Is the PRD-P310250E-55 still a current Kollmorgen product?

It is a legacy ServoStar SP product rather than a current-generation Kollmorgen motion platform. For a replacement project, first determine whether the objective is an exact spare or a controlled modernization; those are two very different procurement decisions.