EM-368C is a high-current, four-quadrant full-bridge driver for brushed DC motors. It is designed for applications requiring bidirectional motor control, adjustable motion profiles, regenerative braking and Modbus communication.
The power stage uses smooth-switching technology to reduce electromagnetic emissions. Two PWM frequencies are available: 2 kHz for higher current capability and 16 kHz for quieter motor operation.
The full-bridge power stage supports forward and reverse motoring as well as controlled braking in both directions. This enables rapid deceleration, regenerative braking and accurate control of the motor.
During standby, the power stage can be configured for either brake mode or freewheel mode. Brake mode electrically restrains the motor, while freewheel mode releases it from active drive and braking.
The FW and BW inputs start the motor in the forward and reverse directions. The STOP input stops the motor, while separate Limit-FW and Limit-BW inputs can be used for direction-specific end-limit switches.
In continuous mode, the motor runs for as long as the corresponding direction command remains active. In impulse mode, a short command starts the motor and another command changes or stops the operating state.
Adjustable acceleration and deceleration ramps provide smooth starts, stops and direction changes. The adjustable current limit protects the motor and mechanical system against excessive current and torque.
During the start ramp, the selected current limit is temporarily increased by 25%. The maximum available starting current is limited to 80 A.
The start-kick function provides additional starting effort in applications with high starting friction. Automatic reverse can change the motor direction according to the configured operating conditions.
At 2 kHz, the power stage provides its highest continuous and peak current capability. The 16 kHz setting enables quieter motor operation with moderately reduced output current.
The digital inputs are divided into control and limit groups. Each group can be configured independently for NPN or PNP control logic.
The fault output is normally inactive and becomes active-high if an overtemperature or, depending on the selected parameters, a current-trip condition occurs.
Applying an external active signal to the disable function stops the motor and prevents a new start while the signal remains active. Where permitted by the wiring instructions, several compatible drivers can be interconnected to provide synchronized stopping.
The NPN open-collector brake output can control an external magnetic brake or braking resistor. The output is rated for a maximum current of 5 A and a maximum voltage of 55 V.
The integrated two-wire RS-485 interface supports the Modbus RTU protocol at 9.6 or 19.2 kbit/s. The bus can be used to control motor speed and direction and to adjust acceleration, deceleration and current-limit settings.
Parameter setting and monitoring are also available through the bus. Detailed communication information is provided in a separate Modbus instruction guide.
| Program version | EM-368 v2.1 |
| Nominal supply voltage | 12–48 VDC |
| Supply voltage range | 10–58 VDC |
| Adjustable overvoltage limit | 15–65 V, subject to hardware limitations |
| Start-up voltage | 9 V |
| Shutdown voltage | 8 V |
| Continuous current at 2 kHz, 100% PWM | 35 A (Ta < 50 °C) |
| Continuous current at 2 kHz, 5–99% PWM | 25 A (Ta < 50 °C) |
| Continuous current at 16 kHz, 100% PWM | 30 A (Ta < 50 °C) |
| Continuous current at 16 kHz, 5–99% PWM | 20 A (Ta < 50 °C) |
| Peak current at 2 kHz | 50 A for 10 s |
| Peak current at 16 kHz | 40 A for 10 s |
| Adjustable current limit | 1–60 A (max. 80 A at startup) |
| Start-ramp current-limit boost | 25% |
| Overtemperature limit | 100 °C |
| Adjustable start and stop ramps | 0–5 s |
| PWM frequency | 2 kHz / 16 kHz |
| Digital input levels | High = 4–30 V / Low = 0–1 V |
| Control input impedance | typ. 47 kΩ |
| Limit and pulse input impedance (pins 2 and 3) | typ. 10 kΩ |
| Control input response time | typ. 5 ms |
| Fault output | PNP open collector, 12–25 V / max. 50 mA |
| Brake output | NPN open collector, max. 55 V / 5 A |
| Minimum braking resistance at 24 V | 4.7 Ω |
| Minimum braking resistance at 48 V | 10 Ω |
| Disable input activation | Uin > 1 V |
| RS-485 | Two-wire half-duplex, Modbus RTU, 9.6 or 19.2 kbit/s |
| Motor and supply connectors | Max. 2.5 mm² cable |
| Control connectors | Max. 1 mm² cable |
| Dimensions | 89 × 72 × 30 mm |
| Dimensions with DIN-rail base | 90 × 80 × 50 mm |
| Weight | 155 g |
| EMC | CE tested for industrial environments |
| Operating temperature (Ta) | −40…+60 °C |
Ordering larger quantities +100pcs.
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