EM-348-48V is a four-quadrant, full-bridge driver platform for brushed DC motors operating in nominal 24–48 VDC systems. It is designed for applications requiring smooth motion control, adjustable current limiting and flexible local or bus-based operation.
The power stage uses smooth-switching technology to reduce radio-frequency emissions. Two PWM frequencies are available: 2 kHz for higher current capability and 16 kHz for quieter motor operation.
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 and can also be used as an electronic end-stop.
During startup, the maximum available current can rise to 30 A to provide additional torque for overcoming starting friction.
At 2 kHz, the power stage provides its highest continuous current capability. The 16 kHz setting enables quieter motor operation but reduces the available output current.
The driver includes an NPN open-collector brake output. Depending on the application and firmware configuration, it can be used to control an external magnetic brake or a braking resistor for managing regenerated braking energy.
Pins 11 and 12 provide configurable multifunction inputs. Depending on the installed firmware, the inputs can operate as digital control inputs or as 0–5 V or 0–10 V analog inputs.
The control inputs and the limit or pulse inputs are divided into separate groups. Their logic can be configured independently for NPN or PNP operation.
The EM-348-48V hardware platform is available with several firmware variants for different applications. Basic-drive firmware provides conventional direction and speed control.
Positioning firmware can use pulse feedback or analog position feedback, depending on the selected firmware version. The technical data below applies to the EM-348-48V hardware with SPF firmware version 1.8.
The integrated two-wire RS-485 interface supports the Modbus RTU protocol. It enables motor control, operating-value monitoring and parameter adjustment through a common bus.
Several driver units can be connected to the same RS-485 network and controlled by one bus master.
Parameters and operating values can be accessed through Modbus or directly with the EM-236 Interface Unit.
PC-based configuration and monitoring are available using the EM-328 interface and EmenTool Lite. Firmware updates can be installed using EmenTool.
| Firmware version | SPF v1.8 |
| Supply voltage | 20–55 VDC |
| Adjustable overvoltage limit | 15–65 V |
| Start-up voltage | 9 V |
| Shutdown voltage | 8 V |
| Continuous current at 2 kHz, 100% PWM | 10 A (Ta = 15 °C) |
| Continuous current at 2 kHz, 5–99% PWM | 7 A (Ta = 15 °C) |
| Continuous current at 16 kHz, 100% PWM | 7 A (Ta = 15 °C) |
| Continuous current at 16 kHz, 5–99% PWM | 4 A (Ta = 15 °C) |
| Peak current at 2 kHz | 30 A for 5 s |
| Peak current at 16 kHz | 25 A for 5 s |
| Adjustable current limit | 0.1–25 A (max. 30 A at startup) |
| Overtemperature limit | 100 °C |
| Adjustable start and stop ramps | 0–5 s |
| PWM frequency | 2 kHz / 16 kHz |
| Analog inputs (pins 11 and 12) | 0–5 V or 0–10 V |
| 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, 22 V / max. 20 mA |
| Brake output | NPN open collector, max. 55 V / 1.5 A |
| Disable input activation | Uin > 4 V (PNP) |
| RS-485 | Two-wire half-duplex, Modbus RTU, 9600 bit/s |
| Motor and supply connectors | Max. 2.5 mm² cable |
| Control connectors | Max. 1 mm² cable |
| Dimensions | 42 × 72 × 25 mm |
| 6 A version dimensions | 42 × 72 × 18 mm |
| Dimensions with DIN-rail base | 45 × 80 × 45 mm |
| EMC | CE tested for industrial environments |
| Operating temperature (Ta) | −40…+60 °C |
| Weight | 75 g (6 A version: 48 g) |
Ordering larger quantities +100pcs.
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