EM-241-SPF is a positioning driver for brushed DC motors. Its high-efficiency solid-state power stage uses MOSFET technology, providing a long service life compared with electromechanical relay-based control solutions.
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 analog position command supports 0–5.5 V, 0–11 V and 4–20 mA signal ranges. The input can be freely scaled within the selected range.
The maximum electrical positioning accuracy of the driver and feedback system is 0.2%, making the EM-241-SPF suitable for a wide range of actuator-positioning applications.
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 enables the driver to detect the direction of movement from the pulse sequence.
The pulse inputs support frequencies up to 1 kHz, with a pulse sampling interval of 0.2 ms.
The position command can be supplied as a 0–5.5 V, 0–11 V or 4–20 mA analog signal. The selected input range can be scaled to match the required movement range.
A 10 kΩ positioning potentiometer is recommended when a potentiometer is used to provide the position command. The maximum permitted potentiometer resistance is 22 kΩ.
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, start and stop 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.
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.
Firmware version 1.6 and later also supports an optional bus communication function. Separate instructions are available for configuring and using the bus interface.
An on-board LED indicates fault conditions using blinking codes. Fault information can also be provided through Combiport, located at pin 13.
Depending on its configuration, Combiport can operate as a fault output, a position-reached output, an analog position signal output or a disable input. When configured as an analog position output, a 0 V signal indicates a fault condition.
The EM-241-SPF has a wide operating temperature range and has been EMC tested for household and industrial environments. The same enclosure options available for the standard EM-241 driver card can also be used with the EM-241-SPF.
| Supply voltage | 10–35 V |
| Shutdown voltage | 8 V |
| Power-up voltage | 9 V |
| Motor current, continuous | 15 A |
| Motor current, momentary | 30 A |
| Current limit | 0.1–20 A, max. 30 A during start |
| Overtemperature limit | 100 °C |
| PWM frequency | 2 kHz |
| Pulse sampling interval | 0.2 ms |
| Maximum pulse input frequency | 1 kHz |
| Position control input ranges | 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 | Uin < 1 V (NPN) |
| Indication output impedance | 1 kΩ |
| Motor and supply connectors | Max. 2.5 mm² cable |
| Signal connectors | Max. 1 mm² cable |
| Operating temperature (Ta) | −40…+60 °C |
| Dimensions | 72 × 42 × 25 mm |
| Weight | 80 g |
| EMC | EN 55022B and EN 61000-4-3, -4, -5 and -6 passed |
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