EM-347B is a brushless DC motor driver featuring hall sensor feedback, an efficient MOSFET power stage, and compatibility with 120° commutation. The true 4-quadrant power stage enables regenerative braking: during braking the supply voltage rises, which can be controlled with a braking resistor, or redirected back into the battery in battery-powered systems.
The device includes essential digital inputs such as direction, brake, start/stop and disable, along with filtered analog inputs for speed and current control. A digitally presettable second speed (speed-2) can be activated via command input.
The EM-347B includes two NPN indication outputs for fault and overcurrent. All fault conditions such as overvoltage, undervoltage and overtemperature are also indicated via an on-board LED.
Overtemperature and current limit events can be reset using a reset input, reset timer, or by setting speed command to zero. Two control methods are available:
Start/stop ramps operate in both modes, and all ranges and ramp values are fully adjustable. The analog inputs accept filtered PWM signals, allowing PWM-based control of speed and current.
Configuration can be done using the EM-236 interface unit or the PC software Emen-Tool Lite together with the EM-268 adapter cable. All parameters are stored in non-volatile memory, and motor current and RPM can be monitored in real time.
The EM-347B can be mounted on a DIN-rail base, and enclosure options are available for different industrial integration needs.
| Supply voltage | 12–48 V (11–60 VDC) |
| Overvoltage limit | 15–65 V (adjustable) |
| Idle current | typ. 30 mA |
| Idle current (shutdown) | 0.2 mA (shutdown connected to GND) |
| Max current (cont.) | 50 A (Tamb 50°C) |
| Max current (cont., fan) | 60 A |
| Peak current | 80 A (5 s) |
| Brake output current (pin 21) | 20 A |
| Recommended brake resistor | 1.5–10 Ω |
| PWM frequency | typ. 16 kHz |
| Overtemperature shutdown | 90°C |
| Fan output | ON above 65°C, 12 V / 100 mA max |
| Current limit setting | 1–100 A (step 1 A) |
| Current limit analog scale | 0–5 V = 0–100 A |
| Digital input logic | “Off” = 0–1 V or open / “On” = 4–30 V |
| Input impedance (logic) | 10 kΩ |
| Shutdown input | open or GND (GND = low idle) |
| Digital input response | 2 ms |
| Analog input range | 0–5 V up to 0–10 V |
| Analog input impedance | 100 kΩ |
| Analog input filter | 100 Hz |
| RS-485 interface | 9600 / 19200 baud, Modbus RTU |
| Overcurrent output | NPN max 2 A / 60 V |
| Fault output | NPN max 50 V / 50 mA |
| Cooling fan output | 12 V, max 100 mA |
| EMC | Tested for industrial environment |
| PCB material | UL94V-0 |
| Dimensions | 140 × 122 × 43 mm (56 mm with fan) |
| Weight | 520 g (550 g with fan) |
