EM-352-SBL is a compact positioning driver for brushless DC motors with Hall-sensor feedback. It combines an integrated positioning servo, an efficient MOSFET power stage, true four-quadrant operation and RS-485 Modbus RTU communication in one DIN-rail-mountable module.
The driver uses the motor's Hall signals for both commutation and position feedback. This enables servo-like positioning without requiring a separate position encoder.
The EM-352-SBL can operate as a locally controlled actuator using digital and analog signals or as a remotely controlled positioning system in a Modbus network.
The EM-352-SBL uses Hall-sensor transitions as incremental position-feedback pulses. The internal positioning controller counts these pulses and drives the motor toward the commanded position.
The available positioning resolution depends on the number of motor pole pairs. A motor with one pole pair generates six detectable Hall positions per motor revolution, while a motor with seven pole pairs provides 42 positions per revolution.
When a gearbox is used, the mechanical output resolution increases according to the gear ratio. This allows accurate positioning even when the motor itself provides a relatively small number of Hall transitions per revolution.
Digital inputs are available for reset or homing, disable, local/bus selection and safety-stop functions. The analog position-reference input supports a 0–5 V signal and can be scaled for input ranges up to 0–10 V.
The RS-485 interface uses the Modbus RTU protocol and supports remote position control, parameter setting and status monitoring. Selected input and output functions can be configured through parameters to suit different applications.
The true four-quadrant power stage supports motoring and controlled braking in both directions. This provides active deceleration and accurate control during direction changes.
When the motor generates energy during braking, the energy is returned to the DC supply. In a battery-powered system, the energy can be absorbed by the battery. In other supply systems, excess energy can be dissipated through an external braking resistor controlled by the brake output.
The adjustable current limit protects the motor and power stage under overload conditions. The current limit can be set between 0.1 A and 12 A in 0.1 A steps.
Current-trip protection can stop the motor when an overload persists. Depending on the configured operating mode, a current-limit fault can be reset using the reset input, a reset timer or by reducing the analog speed or position reference to zero.
Built-in protection functions include overvoltage, undervoltage and overtemperature shutdown. Fault conditions are indicated by an on-board LED and can also be monitored through the Modbus interface.
The PNP fault output can be used to forward fault information to an external controller or other equipment.
Parameters can be configured using the EM-236 Interface Unit or with the EmenTool Lite PC application and EM-328 adapter cable. All parameter settings are stored in non-volatile memory.
Motor current, rotational speed and diagnostic information can be monitored through the same configuration interface. Parameter setting and monitoring are also available remotely through the RS-485 Modbus interface.
The driver includes a fan-control output that becomes active when the driver temperature exceeds 55 °C. The output can control a compatible external cooling fan with a maximum current of 100 mA.
The compact driver is designed for DIN-rail mounting. Additional enclosure options are available for integration into control cabinets and OEM equipment.
Typical applications include valve and damper actuators, linear actuators, small servo-like machine drives, automated gates and covers, mechanical positioning systems, and compact OEM motion modules requiring Modbus control.
| Nominal supply voltage | 12–24 VDC |
| Operating supply-voltage range | 11–35 VDC |
| Overvoltage shutdown | 40 V |
| Idle current | typ. 30 mA |
| Maximum continuous motor current | 8 A at 40 °C ambient temperature |
| Maximum peak motor current | 12 A for 5 s |
| Maximum brake output current | 3 A |
| PWM frequency | typ. 16 kHz |
| Overtemperature shutdown | 90 °C |
| Current-limit setting | 0.1–12 A in 0.1 A steps |
| Digital input, off state | 0–1 V or open circuit |
| Digital input, on state | 4–30 V |
| Digital input impedance | 10 kΩ |
| Digital input response time | 2 ms |
| Analog input range | 0–5 V, scalable up to 0–10 V |
| Analog input resolution | 10-bit, 1024 steps |
| Analog input impedance | 100 kΩ |
| Analog input filter | 100 Hz |
| Maximum Hall-input frequency | 800 Hz |
| Fault output | PNP, max. 50 mA; selectable 5 V or Vcc level |
| Fan output | Active above 55 °C, max. 100 mA |
| EMC | Measured for industrial environments |
| PCB flammability class | UL 94 V-0 |
| Dimensions | 65 × 73 × 22 mm |
| Weight | 76 g |
Ordering larger quantities +100pcs.
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