EM-356-SBL is a high-power positioning driver for brushless DC motors with Hall-sensor feedback. It combines an efficient MOSFET power stage with true four-quadrant operation and regenerative braking capability.
The driver supports 120° commutation and 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-356-SBL can operate as a locally controlled actuator or as a remotely controlled positioning system in an RS-485 Modbus RTU network. Its high current capacity makes it suitable for demanding industrial and OEM motion-control applications.
The EM-356-SBL uses the motor's Hall-sensor transitions as incremental position-feedback pulses. The available positioning resolution therefore 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.
The driver includes a 31-bit position counter, providing a movement range of approximately 2.147 billion count values. This allows long travel distances and high gear ratios to be used without quickly reaching the position-counter limit.
A defined reference or homing point is required to establish a known physical position when using incremental Hall-sensor feedback.
The internal positioning controller provides detailed adjustment of motion dynamics, braking behaviour, start and stop ramps, and positioning accuracy.
Motor current, speed and positioning behaviour can be adapted to the mechanics of the application. Input and output functions are parameter-configurable, allowing the driver to be used with a wide variety of actuators and control systems.
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 motor control, position commands, parameter setting and status monitoring.
The 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, it 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.
Built-in protection functions include overvoltage, undervoltage and overtemperature shutdown. Adjustable current limiting and current-trip functions protect the motor and electronics against overloads.
Faults are indicated by an on-board LED and can also be monitored through Modbus. Depending on the configured operating mode, a fault can be reset using the reset input, a reset timer or by reducing the analog position reference to zero.
Parameters can be configured using the EM-236 Interface Unit or with the EmenTool Lite PC application and EM-328 adapter. All parameter settings are stored in non-volatile memory.
Motor current, speed, position and diagnostic information can be monitored through the same configuration interface or through Modbus.
The driver can be mounted on a DIN rail and is also available with enclosure options suitable for OEM integration.
Typical applications include high-torque valve and damper actuators, heavy linear actuators, automated doors and covers, mechanical indexing systems, and industrial machinery requiring servo-like movement and Modbus control.
| Nominal supply voltage | 12–48 VDC |
| Operating supply-voltage range | 11–56 VDC |
| Overvoltage shutdown | 60 V |
| Idle current | typ. 30 mA |
| Maximum continuous motor current | 15 A at 40 °C ambient temperature |
| Maximum continuous motor current with fan | 20 A at 40 °C ambient temperature |
| Maximum peak motor current | 40 A for max. 2 s |
| Maximum brake output current | 10 A, pin 21 |
| PWM frequency | typ. 16 kHz |
| Overtemperature shutdown | 90 °C |
| Current-limit setting | 1–40 A in 1 A steps |
| Analog current-limit scale | 0–5 V corresponds to 0–40 A |
| 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 |
| Position-counter resolution | 31-bit, approximately 2.147 billion count values |
| Maximum Hall-input frequency | 800 Hz |
| Fault output | PNP, max. 20 mA; selectable 5 V or 12 V level |
| Fan output | NPN, 12 V, max. 70 mA |
| EMC | Measured for industrial environments |
| PCB flammability class | UL 94 V-0 |
| Dimensions | 89 × 73 × 32 mm |
| Height with fan | 44 mm |
| Weight | 150 g |
| Weight with fan | 200 g |
Ordering larger quantities +100pcs.
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