EM-352-SBL is a compact brushless DC motor driver with Hall sensor feedback and an integrated positioning servo. It combines a high-efficiency MOSFET power stage, true 4-quadrant operation with regenerative braking, and RS-485 Modbus communication into one DIN-rail mountable module.
EM-352-SBL uses the motor’s Hall sensor pulses not only for commutation, but also for position feedback – similar to a servo system. The controller counts the Hall pulses with a high-resolution position counter and drives the motor to the commanded position using an internal servo amplifier.
The positioning resolution depends on the number of motor pole pairs. For example, a 1 pole-pair motor gives 6 positions per revolution, while a 7 pole-pair motor gives 42 positions per revolution. Since these pulses are counted from the motor shaft, a gearbox can be used to significantly improve the mechanical resolution.
The driver provides all essential control inputs for automation use:
EM-352-SBL can be used either as a locally controlled actuator (switches and analog signals) or as a fully bus-controlled positioning driver in a Modbus network. Some inputs and outputs are configurable via parameters, allowing flexible use in different applications.
The driver includes overvoltage, undervoltage and overtemperature protection. Fault situations are indicated by the on-board LED and can be monitored via the Modbus interface. Current limiting and I-trip functions protect the motor and power stage under overload conditions. Current limit faults can be reset with the reset input, via a reset timer or by setting the analog speed/position reference to zero.
Regenerative braking is supported by the true 4-quadrant power stage. During braking the supply voltage rises, and this can be managed either with a braking resistor output or, in battery-supplied systems, by feeding the braking energy back to the battery.
Parameters can be set digitally with the EM-236 interface unit or with the Emen-Tool Lite PC software via the EM-328 adapter cable. All parameters are stored in non-volatile memory. Through the same interface, motor current and RPM can be monitored for commissioning and diagnostics. Parameter setting and monitoring are also possible via the RS-485 bus, enabling full remote configuration.
The device is designed for DIN-rail mounting, and different enclosure options are available for integration into control cabinets and OEM equipment.
| TECHNICAL DATA EM-352-SBL | |
|---|---|
| Supply voltage | 12–24 V (11–35 Vdc) |
| Overvoltage shut down | 40 V |
| Idle current | typ. 30 mA |
| Max current | 8 A cont. (Tamb. 40 °C) |
| Max peak current | 12 A (5 s) |
| Max brake output current | 3 A |
| PWM frequency | typ. 16 kHz |
| Overtemperature shut down | 90 °C |
| Current limit setting | 0.1–12 A (step 0.1 A) |
| Logic level of digital inputs | "off" = 0–1 V or open / "on" = 4–30 V |
| Input impedance of logic inputs | 10 kΩ |
| Response time of digital input | 2 ms |
| Analog input range | 0–5 V up to 0–10 V |
| Analog input resolution | 10 bit (1024 steps) |
| Input impedance of analog inputs | 100 kΩ |
| Input filter of analog input | 100 Hz |
| Hall input max frequency | 800 Hz |
| Fault outputs | PNP max 50 mA (5 V/Vcc) |
| Fan output | Turns on when temp. > 55 °C, max. 100 mA |
| EMC | Measured for industrial environment |
| PCB material flammability class | UL94V-0 |
| Dimensions | 65 × 73 × 22 mm |
| Weight | 76 g |
