SM3 109-525-2237A-5 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
The Bosch Rexroth Indramat SM3 109-525-2237A-5 is part of the SM AC Inverters series and features an 8-pin command plug with a 6-pin diagnostic plug. It uses a 2 A fast control fuse and incorporates a motor temperature sensor thermistor as well as a digital signal rotor feedback type. The unit supports a torque reduction ratio of 1:5 and utilizes a minimum smoothing capacitance of 4700 microfarads.
Internal Product Review
The SM3 109-525-2237A-5 is a Bosch Rexroth Indramat SM AC inverter with a +24 V enable input and digital signal rotor feedback for dependable drive control. An 8-pin command plug and thermistor-based motor temperature sensing support clean integration and stable protection, making this inverter a strong choice for precise AC drive applications.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The SM3 109-525-2237A-5 is an AC inverter module produced by Bosch Rexroth Indramat within the SM AC Inverters series. It occupies a midrange position where compact packaging and integrated signal conditioning are needed. By rectifying AC mains power to DC and then reconstructing a variable-frequency output, the unit supplies closed-loop speed and torque control for synchronous or asynchronous motors. These motors can drive conveyors, unwinders, or pick-and-place axes on automated assembly lines.
Control and monitoring connections are organized through an 8-pin command plug that carries analog velocity references and the enable line. A separate 6-pin diagnostic plug allows service tools to sample internal signals. The drive activates only when the controller supplies +24 V, and the bridge is isolated if the sense-node voltage rises above 8 V. Overcurrent incidents trip a front-panel fast-acting 2 A fuse. Encoder feedback uses a cable with ten 0.14 mm² conductors and four 0.5 mm² conductors. A thermistor in the motor provides temperature data. Digital rotor feedback and a 7.5 V rapid-command line support the control interface. A 12 kΩ torque-reduction resistor and a 300 kΩ P-regulator resistor provide additional signal conditioning.
Energy storage and loop-tuning components stabilize the drive during dynamic load changes. The current regulator uses a 0.068 µF film capacitor for high-frequency filtering, while the DC link requires at least 4700 µF of smoothing capacitance to prevent bus voltage sag during acceleration. For an alternative speed-feedback arrangement, the tacho input is matched with a 3.9 kΩ adaptation resistor and calibrated to a gain of 2.7 mV/rpm. This arrangement keeps the analog feedback linear within ±5% accuracy. When torque limiting is necessary, a reduction network with a 1:5 ratio and a 12 kΩ shunt resistor scales the command. The network allows the machine to transition from high starting torque to lower holding torque without saturating the power stages.
