SPM 17-TB Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SPM 17-TB is part of the SPM Inverter Modules series and features dedicated ports for motor encoder (X5), spindle encoder (X55), and control (X6). It provides a setpoint test voltage of 7.8 V and a terminal screw torque specification of 3.7 Nm. The module also supplies 24 V from the X35 output and has a position detect time of 50 ms.
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Product Description:
Bosch Rexroth Indramat manufactures the SPM 17-TB inverter module within its SPM Inverter Modules series. The device supplies regulated power and feedback processing for spindle motors and auxiliary axes, forming part of a modular drive stack inside computerized numerical control machinery. In an automation environment, it bridges the DC link from a common supply to the individual motor phases and delivers the fast current transitions required for precision machining and positioning tasks. The housing shares mechanical dimensions with other SPM units, allowing stack mounting in cabinets without additional brackets and helping maintain a compact drive layout.
The primary interface for control commands is the front-panel connector designated X6, while real-time rotor feedback from the servo is routed through the motor encoder connector X5. Separate high-resolution spindle position data reaches the drive over connector X55, which keeps command and feedback paths clearly assigned. A dedicated low-voltage rail on terminal 24 V powers the encoder electronics and internal logic. For protective coordination, the module introduces an FGI blocking delay of 2 s before tripping the power stage after a fault is detected, and during normal homing sequences a position is confirmed within 50 ms. This combination supports stable response during rapid axis movements without interrupting normal control flow.
Thermal and electrical limits are supervised through additional diagnostics. An I²t algorithm issues a prewarning after 0.5 s of overload integration, giving the control system time to reduce demand before the inverter is disabled. For analog verification, the setpoint output can be probed with a reference of 7.8 V, which allows signal checks during setup or troubleshooting. Field wiring is secured under terminal screws tightened to 3.7 Nm, a torque value that maintains reliable electrical contact under vibration while helping prevent damage to the connection points.
Frequently Asked Questions about SPM 17-TB:
Q: Which control port is available on the SPM 17-TB inverter module?
A: The SPM 17-TB module features a control port labeled X6 for control signal connection.
Q: What spindle encoder port does the SPM 17-TB offer?
A: This module provides a spindle encoder port labeled X55 for direct spindle encoder interface.
Q: What is the position detect time on the SPM 17-TB module?
A: The SPM 17-TB inverter module has a position detect time of 50 milliseconds.
Q: What is the recommended terminal screw torque for the SPM 17-TB?
A: Terminal screw torque for the SPM 17-TB is rated at 3.7 Nm to ensure secure electrical connections.
Q: What output supply voltage is provided at the X35 terminal on the SPM 17-TB?
A: The X35 output supply on this module provides 24 V for auxiliary device powering.
