EM-324-SAF is a compact positioning driver for brushed DC motors. Its solid-state power stage uses efficient MOSFET technology, providing a long service life compared with electromechanical relay-based control solutions.
Position control and feedback are based on analog signals. The position command can be provided as a voltage or current signal, while the feedback can be supplied as a voltage signal or by an external feedback potentiometer.
The maximum positioning accuracy is 0.2%, making the driver suitable for a wide range of actuator-positioning applications.
The position command can be supplied as a 0–5.5 V, 0–11 V or 4–20 mA analog signal. Position feedback can be provided as a 0–5 V or 0–10 V voltage signal.
Potentiometer feedback is also supported. The driver provides auxiliary voltage outputs for supplying an external feedback potentiometer.
The movement range can be restricted at both ends using software limit parameters. Motor speed and current limits can be configured separately for the forward and reverse directions.
Additional parameters include load compensation, positioning dead zone, acceleration and deceleration ramps, and a braking zone. These adjustments support smooth direction changes and accurate approach to the requested position.
The driver supports 2 kHz and 16 kHz PWM frequencies. The 2 kHz setting provides a continuous motor current of up to 4 A.
The 16 kHz setting moves the switching frequency above the normal audible range, providing quieter motor operation with a continuous current capacity of up to 3 A.
The adjustable current limit ranges from 0.1 A to 6 A. During motor start-up, the available current limit can temporarily reach 8 A.
The driver includes overtemperature protection with a 100 °C limit. It also provides fault indication through the on-board LED and configurable output functions.
Parameters and operating status can be configured and monitored using the EM-236 Interface Unit. Parameter settings can also be copied easily from one driver to other driver units.
An on-board LED indicates fault conditions using blinking codes.
Combiport, located at pin 13, can be used to forward fault information to other driver cards. Alternatively, it can provide a position-reached indication or an analog voltage signal representing the current position.
The same connection can also be configured as an active-low disable input. When configured as an analog position output, a 0 V signal indicates a fault condition.
The EM-324-SAF has a wide operating temperature range and has been CE tested for household and industrial EMC environments. Several enclosure options are available for the driver card.
| Supply voltage | 10–35 V |
| Shutdown voltage | 8 V |
| Power-up voltage | 9 V |
| Continuous motor current at 2 kHz | 4 A |
| Continuous motor current at 16 kHz | 3 A |
| Momentary motor current | 6 A |
| Adjustable current limit | 0.1–6 A, max. 8 A during start-up |
| Overtemperature limit | 100 °C |
| PWM frequency | 2 kHz / 16 kHz |
| Analog feedback range | 0–5 V / 0–10 V |
| Position control input range | 0–5.5 V / 0–11 V / 4–20 mA |
| Positioning potentiometer | 10 kΩ recommended, 22 kΩ maximum |
| Current-signal input resistor | 250 Ω, socket provided on the board |
| Position output signal range | 0–5 V or 0.5–4.5 V; 0 V indicates a fault |
| Digital input levels | High = 4–30 V / Low = 0–1 V |
| Digital input impedance | typ. 47 kΩ |
| Limit-FW, Limit-BW and pulse input impedance | typ. 10 kΩ |
| Combiport pin | 13 |
| Fault output | NPN open collector, max. 30 V / 50 mA |
| Disable input | Active when Uin < 1 V (NPN) |
| Position output impedance | 1 kΩ |
| Motor and supply connectors | Max. 1 mm² cable |
| Signal connectors | Max. 1 mm² cable |
| Operating temperature (Ta) | −40…+60 °C |
| Dimensions | 72 × 32 × 25 mm |
| Weight | 80 g |
| EMC | EN 55022B and EN 61000-4-3, -4, -5 and -6 passed |
Ordering larger quantities +100pcs.
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