EM-347B is a brushless DC motor driver with hall sensor feedback and an efficient MOSFET power stage, designed to meet today’s EMC requirements. The driver supports 120° commutation and includes a true 4-quadrant power stage, enabling regenerative braking.
During regenerative braking the supply voltage rises. This rise can be controlled with a braking resistor. In battery-powered systems the regenerated energy can be directed back into the battery, eliminating the need for a braking resistor.
The EM-347B includes basic digital command inputs such as direction, brake, start/stop and disable. In addition, analog inputs are provided for speed and current control. A digitally presettable second speed (speed-2) can be activated via digital command input.
Two NPN outputs are available for fault and overcurrent indication, and several I/O functions can be modified via parameters.
The driver includes protection against overvoltage, undervoltage and overtemperature. Fault situations are indicated with an on-board fault LED. Overtemperature and current limit events can be cleared using a reset input, a reset timer, or by setting the analog speed control to zero.
Start and stop ramps operate in both modes. Speed range, closed-loop RPM range, and ramp times are parameter adjustable. Filtered analog inputs also allow the use of a PWM control signal for speed and current control.
Settings can be configured using the EM-236 interface unit or with a PC running EmenTool Lite together with the EM-268 adapter cable. Parameters are stored in non-volatile memory. The interface also supports monitoring of motor current and RPM.
The device can be mounted on a DIN-rail base, and enclosure options are available.
| 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 (continuous) | 50 A (Tamb 50 °C) |
| Max current (continuous, with fan) | 60 A |
| Max current (peak) | 80 A (max 5 s) |
| Max 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 switch-on | > 65 °C |
| Current limit setting | 1–100 A (step 1 A) |
| Current limit analog scale | 0–5 V = 0–100 A |
| Digital input logic level | “off” = 0–1 V or open / “on” = 4–30 V |
| Logic input impedance | 10 kΩ |
| Shutdown input | open or < 1 V (= low idle) |
| Digital input response time | 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 | 9600 / 19200 baud, Modbus RTU |
| Overcurrent output | NPN max 2 A / 60 V |
| Fault output | NPN max 50 V / 50 mA |
| Fan cooling output | 12 V, max 100 mA |
| EMC | Measured for industrial environment |
| PCB flammability class | UL94V-0 |
| Dimensions | 140 × 122 × 43 mm (56 mm with fan) |
| Weight | 520 g (550 g with fan) |
