Direction and Stop Control

The FW and BW inputs start the motor in the forward or reverse direction. The STOP input shuts down motor operation.

Separate Limit-FW and Limit-BW inputs can stop movement in the corresponding direction while allowing the motor to move away from the active limit in the opposite direction.

Two-Speed Operation

Two configurable speed settings are available. The second speed is activated through the Speed 2 input and can be used as an approach speed, positioning speed or alternative operating speed.

This function is particularly useful when rapid movement is required across most of the travel but a lower speed is preferred near an end position or target.

Analog Speed Control

The Speed 2 input can alternatively be configured as an analog speed-control input. This allows motor speed to be controlled using an external potentiometer, PLC analog output or other compatible voltage source.

The technical data specifies adjustable 0–5 V and 0–10 V analog control ranges.

Acceleration and Deceleration Ramps

Separate start and stop ramps provide smooth acceleration and deceleration. Both ramp times can be adjusted between immediate response and 2.5 seconds.

The ramps reduce mechanical shock and help limit sudden current peaks during starting and stopping.

Current Limiting

The adjustable current limit protects the motor and mechanical system against excessive current and torque during start-up, overload and jam conditions.

The current limit can also be used as an end-stop function when the mechanism is designed to stop against a physical limit.

Continuous and Impulse Control

In continuous mode, the motor runs for as long as the corresponding direction input remains active.

In impulse mode, a short control pulse starts the motor. The operating state remains active until another impulse changes it. Additional configurable functions include start kick and automatic reverse.

Selectable Input Logic

The digital inputs are divided into control inputs and limit inputs. The logic type of each group can be configured independently for NPN or PNP operation.

This allows the driver to be used with different sensors, switches, PLC outputs and control-system architectures.

Fault Input and Output

The FAULT terminal provides both input and output functions. During normal operation, the fault line is high. The driver pulls the line low during an overtemperature condition and, depending on the parameter settings, during a current-trip condition.

Pulling the FAULT line low externally stops the motor and prevents a new start. The fault terminals of several drivers can therefore be linked together to provide synchronized stopping.

Selectable PWM Frequency

The controller supports 2 kHz and 16 kHz PWM frequencies. The 16 kHz setting moves the switching frequency above the normal audible range and provides quieter motor operation.

Configuration and Monitoring

Parameters are configured using the EM-236 Interface Unit. The same interface can be used to monitor controller operation and selected operating values during commissioning and diagnostics.

Mounting Options

The compact controller can be installed as a bare module or fitted into an optional DIN-rail mounting base for control-cabinet installations.

Typical Applications

The EM-324 is suitable for linear actuators, valves, hatches, doors, positioning mechanisms, material-handling equipment and other brushed DC motor applications requiring bidirectional operation, limit inputs and adjustable motion control.