EM-295C is a high-efficiency, one-direction speed controller for brushed DC motors. It uses pulse-width modulation to provide accurate and efficient motor-speed control over a wide supply-voltage range.
Motor voltage is regulated against variations in the supply voltage. Adjustable RxI load compensation improves speed stability when the motor load changes, particularly at low speeds. The adjustable current limit can be used to restrict motor torque or stop the motor during an overload condition.
The EM-295C regulates the motor voltage against supply-voltage variations, helping the motor maintain the requested speed when the input voltage changes.
Adjustable RxI load compensation increases the motor drive as the load rises. This improves speed regulation, especially at low motor speeds where load-related speed changes are usually most noticeable.
The adjustable current limit restricts motor current and torque. Depending on the selected settings, the current limit can regulate the output during loading or stop the motor when an overload condition occurs.
Independently adjustable start and stop ramps provide smooth acceleration and deceleration. Both ramps can be adjusted between 0 and 2.5 seconds.
The driver supports selectable 2 kHz and 16 kHz PWM frequencies. The 2 kHz setting provides the highest continuous current capacity, while 16 kHz enables quieter motor operation with slightly reduced current capability.
Two configurable control inputs are available for functions such as end-limit stopping, external stop, braking and freewheel control. The inputs use positive PNP control logic.
Output 1 can be configured to control an external braking resistor or a magnetic brake. The output is an NPN open-collector output with a maximum current of 3 A.
A flyback diode must be used when Output 1 controls an inductive load such as a magnetic brake coil.
| 12 V system | Greater than 4.7 Ω |
| 24 V system | Greater than 10 Ω |
| 48 V system | Greater than 22 Ω |
The indication output on pin 11 follows the status of the onboard fault LED. It can be used to transmit fault or status information to an external control system.
Parameters can be configured using the EM-236 Interface Unit. The interface is connected to the red onboard connector of the driver.
PC-based configuration is available using the EM-328 interface and EmenTool Lite. Functions such as Output 1 can be assigned through parameters, including parameter 11 where applicable.
| Feature | EM-295C | EM-296C |
|---|---|---|
| Motor direction | One direction | Two directions, four-quadrant operation |
| Regenerative braking | Yes | Yes |
| Recommended motor power | 200 W at 12 V 300 W at 24 V 400 W at 48 V |
200 W at 12 V 300 W at 24 V 400 W at 48 V |
| Continuous current at 2 kHz | 25 A | 25 A |
| Continuous current at 16 kHz | 20 A | 20 A |
| Peak motor current | 40 A for 10 s | 40 A for 10 s |
| Current limit | Adjustable | Adjustable |
| Start and stop ramps | 0–2.5 s, adjustable | 0–2.5 s, adjustable |
| Brake-resistor output | Output 1, max. 3 A | Output 1, max. 3 A |
| Magnetic-brake control | Yes | Yes |
| Auxiliary input functions | Limit, stop, brake or freewheel | Limit, stop, brake or freewheel |
| Fan option | No | Yes, for increased continuous current |
| Operating temperature | −40…+70 °C | −40…+70 °C |
| Weight | 80 g | 115 g without fan / 130 g with fan |
| Nominal supply voltage | 12–48 VDC |
| Supply voltage limits | 10–58 VDC |
| Adjustable overvoltage shutdown | max. 60 V |
| Continuous motor current at 2 kHz | 25 A (Ta < 50 °C) |
| Continuous motor current at 16 kHz | 20 A (Ta < 50 °C) |
| Peak motor current | 40 A for 10 s |
| Voltage drop at full speed | typ. 0.7 V |
| PWM frequency | 2 kHz or 16 kHz |
| Adjustable start ramp | 0–2.5 s |
| Adjustable stop ramp | 0–2.5 s |
| Control input range | 0–5 V or 0–10 V, adjustable |
| Motor output range | 0–10 V to 0–55 V, adjustable |
| Output 1 | NPN open collector with 2.2 kΩ pull-up |
| Output 1 maximum current | 3 A; flyback diode required with an inductive load |
| Indication output (pin 11) | PNP open collector, 12 V / max. 10 mA |
| Control input 1 | PNP, Rin 100 kΩ |
| Control input 2 | PNP, Rin 10 kΩ |
| Digital input levels | Low = 0–1 V / High = 4–30 V |
| Power connectors | Max. 2.5 mm² cable |
| Control connectors | Max. 1 mm² cable |
| EMC | EN 50081-2 and EN 50082-2, industrial environment |
| Operating temperature (Ta) | −40…+70 °C |
| Weight | 80 g |
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