SIGMATEK SDD310-2 Retrofit-Compatible 3-Axis Servo Drive

SIGMATEK SDD310-2 Retrofit-Compatible 3-Axis Servo Drive for Legacy System Modernization

The SIGMATEK SDD310-2 is a compact, high-performance 3-axis servo drive engineered for demanding industrial automation environments. As legacy SIGMATEK DIAS-based control architectures approach end-of-life, the SDD310-2 has become a critical retrofit component for plant engineers and maintenance teams seeking to extend operational continuity without committing to a full platform migration. Whether you are replacing a failed drive in an existing servo axis, upgrading a multi-axis motion control cabinet, or migrating from an older SDD-series predecessor, the SDD310-2 delivers the electrical compatibility, communication interface alignment, and mechanical form factor required for a controlled, low-risk retrofit.

NINERMAS maintains verified stock of the SDD310-2 sourced from authorized supply channels, with each unit subject to pre-shipment functional testing and covered by a 12-month warranty. Our technical team supports customers through the full replacement cycle — from initial compatibility assessment and terminal wiring verification through to on-site commissioning guidance and post-installation validation.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing the SDD310-2 in an active production environment requires a structured approach that accounts for the interdependencies within the SIGMATEK DIAS control platform. The SDD310-2 does not operate in isolation — it communicates in real time with the central SIGMATEK CP controller (such as the CP174 or CP184 series) over the DIAS-Bus, and its axis parameters are managed through the LASAL software environment. Before any physical swap, engineers should export and archive the current axis configuration, including position loop gains, velocity limits, homing sequences, and cam table data.

On the power side, the SDD310-2 draws from the shared DC bus supplied by the system’s servo power supply module. When replacing a drive in a multi-axis cabinet, it is essential to verify that the existing power supply — often a SIGMATEK SPS-series or equivalent regenerative supply — has sufficient headroom to support the replacement unit under peak load conditions. Undersized power capacity is a common cause of nuisance trips and axis faults during initial commissioning after a drive swap.

Terminal wiring is another critical checkpoint. The SDD310-2 interfaces with servo motors through dedicated encoder feedback connectors and motor power terminals. If the original installation used a resolver-based feedback system rather than incremental or absolute encoders, the wiring pinout and signal conditioning requirements must be carefully cross-referenced. In some retrofit scenarios, a signal isolator or feedback converter module may be required to bridge legacy feedback types with the replacement drive’s input specifications.

The DIAS-Bus communication link must be re-established after physical installation. Each module on the DIAS network is assigned a unique node address, and the SDD310-2 must be configured to match the address previously held by the failed unit. Address mismatches will prevent the CP controller from recognizing the drive during startup, resulting in a bus fault that halts the entire control system. This step is performed through the LASAL development environment and should be completed before powering the axis.

For systems that also incorporate SIGMATEK I/O modules — such as the DI or DO series digital I/O modules used for limit switch inputs, axis enable signals, and safety relay feedback — the I/O mapping within the LASAL program must be reviewed to confirm that no address offsets have shifted as a result of the hardware change. Similarly, if the control cabinet includes a SIGMATEK HMI panel running a LASAL HMI application, the axis status pages, alarm displays, and operator control elements should be tested against the replacement drive to confirm correct data binding.

In multi-axis systems where the SDD310-2 coordinates motion with additional single-axis or dual-axis servo drives — for example, a SIGMATEK SDD110 or SDD210 on adjacent axes — the synchronization parameters and electronic gearing ratios must be re-validated after the swap. Motion coordination errors introduced by parameter drift or firmware version mismatches between drives can cause product quality issues or mechanical damage if not caught during commissioning.

Where the retrofit extends beyond a single drive replacement to a broader control system upgrade — for instance, migrating from an older DIAS generation to a current DIAS-2 or DIAS-4 architecture — additional planning is required for backplane compatibility, rack slot assignments, and communication protocol version alignment. In such cases, the SDD310-2 may serve as a transitional component while the broader migration is staged across planned maintenance windows.

Downtime Control During System Migration

Minimizing unplanned downtime is the primary operational concern when replacing a servo drive in a running production line. The SDD310-2 retrofit process is designed to support a controlled, single-shift replacement when properly prepared. The key to downtime control is pre-staging: the replacement unit should be bench-tested and pre-configured with the correct node address and base axis parameters before the maintenance window begins. This eliminates the most time-consuming steps from the critical path on the production floor.

Before powering down the affected axis, the maintenance team should capture a full backup of the LASAL project from the CP controller, including all axis configurations, I/O mappings, HMI project files, and motion program logic. This backup serves both as a recovery point and as the reference document for post-replacement validation. If the system uses a SIGMATEK CP controller with onboard flash storage, the backup can be exported directly via the LASAL project manager over the programming cable connection.

During the physical swap, the DC bus should be fully discharged before disconnecting motor power terminals — servo drive capacitors retain dangerous charge levels for several minutes after power removal. The encoder feedback connector and DIAS-Bus ribbon or cable connections should be labeled and photographed before removal to prevent wiring errors during reinstallation.

After reinstallation and power-up, the commissioning sequence should follow a structured step-by-step approach: first confirm DIAS-Bus communication and node recognition, then verify axis enable and STO circuit integrity, then perform a low-speed jog test before returning the axis to automatic mode. This sequence protects the original program logic and ensures that the control system resumes normal operation without requiring modifications to the LASAL application. With a pre-staged and tested SDD310-2 unit, experienced maintenance teams routinely complete the full replacement and recommissioning within a single planned downtime window of two to four hours.

Retrofit Support FAQ

Q1: Is the SIGMATEK SDD310-2 a direct drop-in replacement for older SDD-series 3-axis drives?
In most cases, yes — the SDD310-2 is designed for backward compatibility within the SIGMATEK DIAS servo drive family. However, customers should verify the firmware version supported by their CP controller and confirm that the motor feedback type (encoder vs. resolver) matches the replacement unit’s input configuration. NINERMAS provides pre-shipment compatibility checks upon request.

Q2: What commissioning steps are required after installing the SDD310-2?
After physical installation, the DIAS node address must be confirmed and the axis parameters uploaded from the LASAL project backup. A low-speed jog test should be performed on each axis before returning to automatic production mode. STO circuit continuity and encoder feedback signal quality should also be verified using the LASAL diagnostic tools before full-speed operation resumes.

Q3: Can the SDD310-2 be used in a system that is being migrated from an older communication protocol?
The SDD310-2 operates on the SIGMATEK DIAS-Bus protocol. If your migration involves transitioning to a different fieldbus — such as EtherCAT, PROFIBUS, or CANopen — a gateway or protocol converter module will be required, or the migration path should be evaluated for a DIAS-native upgrade route. NINERMAS can advise on compatible migration architectures based on your existing control platform.

Q4: What does the 12-month warranty cover, and is pre-shipment testing included?
Every SDD310-2 unit shipped by NINERMAS undergoes functional pre-shipment testing to verify drive initialization, communication interface integrity, and basic axis response. The 12-month warranty covers manufacturing defects and component failures under normal operating conditions. Warranty claims are supported directly through NINERMAS with expedited replacement dispatch to minimize production impact.