KOLLMORGEN SERVOSTAR 601 Retrofit-Compatible Servo Drive

KOLLMORGEN SERVOSTAR 601 Retrofit-Compatible Servo Drive for Legacy Systems

The KOLLMORGEN SERVOSTAR 601 is a high-performance digital servo drive designed for precision motion control in demanding industrial environments. As a retrofit-compatible replacement for aging SERVOSTAR-series amplifiers, the SERVOSTAR 601 enables engineers and maintenance teams to modernize legacy servo axes without redesigning the entire control architecture. Whether you are replacing a failed unit on an existing machine, upgrading a discontinued servo amplifier in a multi-axis gantry, or migrating a legacy CNC or packaging line to a more supportable platform, the SERVOSTAR 601 provides a reliable, field-proven upgrade path with minimal disruption to existing wiring, programming, and mechanical layouts.

Rated at 6A continuous output current with peak current capability suited for high-dynamic servo applications, the SERVOSTAR 601 supports resolver and encoder feedback interfaces, making it compatible with a wide range of KOLLMORGEN AKM and legacy CD-series servo motors. Its compact DIN-rail or panel-mount form factor fits within standard control cabinet footprints, reducing the need for cabinet modifications during retrofit projects. The drive communicates via CANopen and RS-232/RS-485 serial interfaces, and can be integrated into existing SERVOSTAR 600-series multi-axis systems alongside units such as the SERVOSTAR 603, SERVOSTAR 606, and SERVOSTAR 610, preserving the existing communication topology and reducing re-commissioning time.

Before proceeding with a SERVOSTAR 601 replacement, engineers should verify the following on-site parameters: available DC bus voltage and power supply capacity from the existing SERVOSTAR PST power supply module; terminal block wiring assignments for enable, fault, and analog command signals; resolver or encoder cable pinout compatibility with the replacement unit; axis address configuration via DIP switch or software parameter; existing motion program compatibility within the host controller or PLC (such as a KOLLMORGEN S300 or third-party Siemens S7-series controller); HMI screen references to drive status registers; CANopen node ID and baud rate settings; physical installation space and cooling airflow clearance; and the sequence of steps required for safe power-down, drive swap, and re-energization without triggering upstream safety interlocks.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful SERVOSTAR 601 retrofit projects begin with a thorough audit of the existing control cabinet and machine documentation. In multi-axis systems, the SERVOSTAR 601 typically operates alongside other drives in the SERVOSTAR 600 family — such as the SERVOSTAR 603 (3A), SERVOSTAR 606 (6A dual-axis), and SERVOSTAR 610 (10A) — all sharing a common DC bus supplied by a SERVOSTAR PST power supply module. Before replacing a single axis, confirm that the PST module has sufficient headroom to support the remaining axes during the transient inrush of the new drive coming online.

Terminal wiring for the SERVOSTAR 601 follows the standard SERVOSTAR 600-series connector layout. The X3 motor power connector, X4 feedback connector, and X1 control I/O connector positions are consistent across the series, which simplifies direct swap procedures. However, if the original installation used a custom breakout board or signal conditioning module — such as a Phoenix Contact or Weidmüller terminal block adapter — verify that the adapter pinout matches the replacement unit before reconnecting.

For systems where the SERVOSTAR 601 communicates with a host PLC via CANopen, the node ID and baud rate must be configured to match the original settings before the drive is enabled. In installations using a KOLLMORGEN S300 motion controller or a Beckhoff TwinCAT EtherCAT master with a CANopen gateway, the drive object dictionary entries should be verified against the original commissioning records. If the original parameter file is unavailable, the drive can be re-tuned using KOLLMORGEN WorkBench software connected via the RS-232 service port.

Where the machine uses a legacy HMI — such as a Siemens OP270 or a Proface GP-series panel — screen pages referencing drive fault codes, speed references, or torque limits should be reviewed to confirm that register addresses remain consistent after the drive swap. In some installations, a signal isolator or analog signal conditioner between the HMI analog output and the drive command input may need to be recalibrated after replacement.

For I/O-intensive applications, the SERVOSTAR 601’s onboard digital I/O may be supplemented by an external I/O expansion module connected to the host PLC. Confirm that the enable signal, fault reset, and in-position output wiring are correctly mapped in the PLC program before performing the first test run. If the machine uses a safety relay module or a Pilz PNOZ safety controller for axis enable supervision, verify that the safety circuit remains intact and correctly wired to the new drive’s hardware enable input.

Downtime Control During System Migration

Minimizing production downtime during a SERVOSTAR 601 replacement requires careful pre-staging and a structured swap procedure. Begin by downloading the complete parameter set from the existing drive using KOLLMORGEN WorkBench or DRIVE.EXE before the maintenance window. If the drive has already failed and cannot communicate, use the last known commissioning file from the machine documentation archive as the baseline for re-commissioning the replacement unit.

During the physical swap, label all connectors before disconnection and photograph the wiring layout for reference. Power down the DC bus via the SERVOSTAR PST supply and confirm bus voltage has discharged to a safe level before touching any drive terminals. The SERVOSTAR 601’s compact form factor allows the physical exchange to be completed in under 30 minutes in most cabinet configurations, provided the replacement unit has been pre-configured with the correct node ID, axis parameters, and feedback settings before installation.

After reconnection, perform a controlled first-enable sequence with the machine in a safe, unloaded state. Verify that the drive reports no fault codes, that the feedback signal is correctly read (resolver or encoder counts increment in the correct direction), and that the analog command input responds proportionally to the host controller output. Run the axis through a low-speed jog cycle before returning the machine to automatic mode. Document the replacement date, firmware version, and any parameter changes in the machine maintenance log to support future troubleshooting and warranty claims.

For facilities managing multiple SERVOSTAR 601 axes across several machines, maintaining a small buffer stock of pre-configured spare drives significantly reduces mean time to repair (MTTR). Each unit supplied by NINERMAS undergoes a pre-shipment functional test to verify output stage integrity, feedback interface operation, and communication port functionality before dispatch, supporting a rapid swap-and-run approach that keeps production lines moving.

Retrofit Support FAQ

Q: Is the SERVOSTAR 601 a direct drop-in replacement for my existing SERVOSTAR 601 unit?
A: Yes. The SERVOSTAR 601 replacement unit shares the same mechanical footprint, connector layout, and parameter structure as the original. In most cases, restoring the original parameter file via WorkBench software is sufficient to return the axis to full operation without mechanical or wiring modifications.

Q: Can the SERVOSTAR 601 be used to replace a SERVOSTAR 603 or SERVOSTAR 606 in a pinch?
A: The SERVOSTAR 601 (6A) can replace a SERVOSTAR 603 (3A) if the motor current requirement is within the 601’s rating. It cannot directly replace a SERVOSTAR 606 dual-axis unit, as the 606 controls two motor axes from a single housing. Consult your system documentation and confirm axis current requirements before substituting drive models.

Q: What pre-shipment testing is performed on each SERVOSTAR 601 unit?
A: Every SERVOSTAR 601 unit supplied by NINERMAS undergoes a pre-shipment functional test covering output stage continuity, feedback interface signal integrity, communication port response, and basic enable/disable cycle verification. A test report is available upon request. All units are covered by a 12-month warranty against manufacturing defects from the date of shipment.

Q: How quickly can a SERVOSTAR 601 be shipped, and is stock available?
A: NINERMAS maintains inventory of SERVOSTAR 601 units to support urgent replacement requirements. Standard lead time for in-stock units is 3–7 business days for international shipments. For urgent production-down situations, expedited shipping options are available. Contact our team at sale@ninermas.com or +0086 187 5021 5667 to confirm current stock availability and lead time before placing your order.