EM-348-SPF is a full-bridge positioning driver for brushed DC motors. It is designed for motor and actuator applications requiring accurate pulse-feedback positioning, adjustable motion profiles and versatile protection functions.
Position feedback is provided by one- or two-channel pulse signals. Although one-channel feedback can be used, two-channel 0°/90° pulse feedback is recommended for more reliable and secure position monitoring.
The driver includes adjustable acceleration and deceleration ramps for smooth starts and stops. Its adjustable current limit protects the motor against overcurrent and can also be used to detect a mechanical end stop.
Position feedback can be obtained using either one pulse channel or two pulse channels with a 0°/90° phase difference. The two-channel method is preferred because it provides more reliable position information and allows the driver to detect the direction of movement from the pulse sequence.
The pulse inputs support frequencies up to 700 Hz. The maximum electrical accuracy of the driver and feedback system is 0.2%, making it suitable for most actuator-positioning applications.
The requested position is set using an analog control signal. The position input can be scaled to match the required mechanical movement range.
The technical data specifies 0–5 V and 0–10 V analog input ranges for pins 11 and 12.
The parameter set includes an automatic learn routine that helps determine the full mechanical movement range quickly and easily. The usable positioning range can then be restricted from both ends using software limit parameters.
Accumulating pulse-count errors can be corrected using a homing sequence. Homing can be triggered manually or configured to operate automatically.
Motor speed and current limits can be configured separately for the forward and reverse directions. Additional adjustment parameters include load compensation, positioning dead zone, acceleration and deceleration ramps, and a braking zone.
These settings allow the motion profile to be adapted to the mechanics of the application and help provide smooth direction changes, controlled braking and accurate final positioning.
The adjustable current limit protects the motor and power stage against excessive current. It can also be used to detect a mechanical end stop when the motor current rises after the mechanism reaches the end of its travel.
The standard version provides an adjustable current limit from 0.1 A to 25 A, with a maximum of 30 A during start-up. A lower-current 6 A version is also available.
The PWM frequency can be selected between 2 kHz and 16 kHz. The 2 kHz setting provides the highest available output-current capacity.
The 16 kHz setting moves the switching frequency above the normal audible range, providing quieter motor operation with reduced continuous and peak-current capacity.
The driver includes an external brake output for controlling an electromagnetic motor brake. Depending on the application design, the output can also be used to control a braking resistor during regenerative braking.
The brake output is an NPN open-collector output rated for loads up to 35 V and 2 A.
Parameters and operating status can be configured and monitored through the RS-485 interface using the Modbus protocol.
Local configuration and monitoring can also be performed using the EM-236 Interface Unit or the EM-328 interface together with the EmenTool Lite PC application. Firmware updates can be installed using EmenTool.
The power stage uses a smoothed switching method designed to reduce radio-frequency emissions. This can reduce the need for external filtering, although EMC compliance must always be verified for the complete installation.
The compact driver can be installed directly using screw mounting. An optional DIN-rail mounting base is also available for control-cabinet installations.
| PCB and firmware version | PCB v1, EM-348-SPF firmware v1.8 |
| Continuous supply voltage | 10–35 V, maximum |
| Adjustable overvoltage limit | 15–40 V |
| Start-up voltage | 9 V |
| Shutdown voltage | 8 V |
| Continuous output current at 2 kHz | 15 A at 100% duty cycle / 10 A at 5–99% duty cycle |
| Continuous output current at 16 kHz | 10 A at 100% duty cycle / 5 A at 5–99% duty cycle |
| 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 during start-up |
| 6 A version current ratings | Typically 2.5 times lower than the standard version |
| 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 control input levels | High = 4–30 V / Low = 0–1 V |
| Control input impedance | typ. 47 kΩ |
| Pulse inputs | Pins 2 and 3 |
| Pulse input impedance | typ. 10 kΩ |
| Maximum pulse input frequency | 700 Hz |
| Control input response time | typ. 5 ms |
| Fault output | PNP open collector, 12–22 V, max. 50 mA |
| Brake output | NPN open collector, max. 35 V / 2 A |
| Disable input | Active when Uin > 4 V (PNP) |
| Communication interface | Two-wire half-duplex RS-485 |
| Communication protocol | Modbus |
| Communication speed | 9600 bit/s |
| Motor and supply connectors | Max. 2.5 mm² cable |
| Control connectors | Max. 1 mm² cable |
| Dimensions | 42 × 72 × 25 mm |
| Dimensions, 6 A version | 42 × 72 × 18 mm |
| Dimensions with DIN-rail base | 45 × 80 × 45 mm |
| Operating temperature (Ta) | −40…+60 °C |
| Weight | 75 g |
| Weight, 6 A version | 48 g |
| EMC | CE tested for industrial environments |
Ordering larger quantities +100pcs.
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