EM-379 is a high-power brushless DC motor driver with Hall sensor feedback and an efficient MOSFET power stage. The driver supports 120° Hall commutation and includes a true 4-quadrant power stage, enabling regenerative braking.
During regenerative braking, the supply voltage rises. This voltage rise can be controlled using a braking resistor. In battery-powered systems, regenerated energy can be returned to the battery, eliminating the need for a braking resistor.
Cooling is provided through the aluminum base plate. In high-power applications, an additional heat sink or mounting to a sufficiently large metal structure may be required.
The EM-379 includes digital command inputs for:
Analog inputs are available for speed and current-limit control. A digitally presettable second speed can be activated using the speed-2 input.
Several input and output functions can be modified using parameters.
Two NPN outputs are provided for external indication:
Fault conditions are also indicated by an on-board fault LED.
The true 4-quadrant power stage allows controlled operation and braking in both directions. When the motor decelerates, mechanical energy is converted back into electrical energy.
A suitable braking resistor can be connected to limit the resulting rise in supply voltage. The recommended braking resistance is 1.5–10 Ω. When the driver is supplied from a rechargeable battery, the regenerated energy can be returned to the battery.
The driver includes protection against:
Overtemperature and current-limit conditions can be reset using:
The EM-379 provides two selectable speed control modes:
Start and stop ramps operate in both speed control modes. The speed range, closed-loop RPM range, and ramp settings can be configured using parameters.
The analog inputs can be used for both speed and current-limit control. The input range can be selected from 0–5 V up to 0–10 V.
The analog inputs include a 100 Hz filter, allowing PWM signals to be used for speed and current-limit control.
The motor current limit can be set from 1 to 100 A in 1 A steps. An external 0–5 V analog signal can also be used for current-limit control, with 0–5 V corresponding to 0–100 A.
The integrated RS-485 interface supports Modbus RTU communication at 9600 or 19200 baud. It enables external control, parameter access, and monitoring from a host system or PLC.
Optional auxiliary cards can be connected to the A1 expansion socket. Available control methods include:
Parameters can be configured digitally using the EM-236A Interface Unit. PC-based configuration is available using EmenTool Lite together with the EM-328 adapter cable.
Parameter settings are stored in the driver’s non-volatile memory.
DIP switches are available for selecting special operating modes:
The shutdown input places the driver in an ultra-low-power state. It overrides the other control commands and immediately disables motor operation.
When the shutdown input is open or below 1 V, idle current is less than 0.5 mA.
A dedicated 12 V fan output is available for temperature-controlled cooling. The fan output switches on automatically when the driver temperature rises above 65°C.
Heat is transferred through the aluminum base plate. Applications using more than 20 A of continuous current require an additional heat sink or mounting to a sufficiently large thermally conductive metal structure.
| Supply voltage | 12–48 V nominal (11–60 VDC) |
| Overvoltage limit | 15–65 V, adjustable |
| Idle current | Typ. 30 mA |
| Idle current in shutdown | < 0.5 mA (shutdown input open or low) |
| Maximum continuous current | 60 A at Tamb = 50°C |
| Maximum continuous current with fan | 70 A |
| Maximum peak current | 80 A for max. 5 s |
| Cooling requirement | Continuous current above 20 A requires an additional heat sink |
| Maximum brake output current | 20 A (pin 21) |
| Recommended brake resistor | 1.5–10 Ω |
| PWM frequency | Typ. 16 kHz |
| Overtemperature shutdown | 90°C |
| Fan output activation | > 65°C |
| Current-limit setting | 1–100 A in 1 A steps |
| Current-limit analog scale | 0–5 V = 0–100 A |
| Digital input OFF level | 0–1 V or open |
| Digital input ON level | 4–30 V |
| Digital input impedance | 10 kΩ |
| Shutdown input | Open or < 1 V = low-power mode |
| 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 |
| PCB flammability class | UL94V-0 |
| Dimensions | 143 × 110 × 32 mm |
| Weight | 340 g (360 g with fan) |
Ordering larger quantities +100pcs.
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