Product Description:

The SPM 25-TD is an inverter module produced by Bosch Rexroth Indramat for the SPM Inverter Modules series. Within a multi-axis drive lineup, this unit converts the DC link energy from a compatible supply module into controlled three-phase output for servo or spindle amplifiers downstream. By integrating status contacts and diagnostic signaling, it serves as a central power stage that simplifies cabinet wiring and supports coordinated motion control in industrial automation cells.

The internal DC link is maintained at 520 V DC, giving the power semiconductors a fixed voltage window for pulse-width modulation. Continuous machine duty is supported by a rated phase current of 25 A, and this value sets the thermal limits for busbars, fuses, and cooling airflow. Control electronics reference a logic interface level of 24 V DC, so standard PLC I/O can enable, inhibit, or reset the inverter without level shifting. Fault monitoring is divided into 3 fault code channels, allowing rapid isolation of overcurrent, overtemperature, or gate driver errors. For analog velocity or torque control, the module interprets a setpoint with a full-scale amplitude of 7.8 V, matching the output range of typical closed-loop controllers.

This inverter is wired to supply sections designated VM 50 / VM 60 / VM 60/EB, so the DC bus and pre-charge circuits are externalized and need no duplication. Two floating ready contacts provide 2 form-C signals that confirm bus voltage presence and logic readiness to higher-level safety relays. The cast-aluminum housing and heat sink bring the installed mass to 6.80 kg, which aids in heat dissipation while remaining manageable during handling. The module integrates with compatible digital drive controllers and uses a uniform pinout across the series, which helps keep wiring layouts consistent between related modules.