EM-217B is a compact frequency inverter designed for speed control of small single-phase induction motors. It generates two output voltages with a 90° phase difference, eliminating the need for the auxiliary capacitor commonly used with single-phase motors.
The output frequency is adjustable from 15 to 80 Hz. Motor speed can be controlled using a voltage signal, a 4–20 mA current signal, or an external potentiometer.
The EM-217B creates two motor output voltages with a 90° phase difference. This allows a compatible single-phase induction motor to be operated without a separate auxiliary capacitor.
The output stage operates according to the PAM (Pulse Amplitude Modulation) principle. This provides low electromagnetic emissions and makes the controller suitable for applications requiring good EMC performance.
Motor speed can be controlled using a 0–5 V or 0–10 V voltage signal, a 4–20 mA current signal, or an external potentiometer. A 5 V auxiliary output is available for potentiometer control.
The direction of rotation can be changed using a digital command input. A short direction-change delay protects the motor and provides a controlled transition between directions.
The integrated start and stop ramps provide smooth motor acceleration and deceleration. The stop ramp can be disabled when a faster, uncontrolled stop is required.
All control inputs are galvanically isolated from the mains supply with an isolation voltage of 1500 Vrms. This simplifies integration into automation systems and protects the external control circuitry.
The EM-217B also includes a self-resetting mains fuse, providing improved protection against mains voltage spikes and temporary overload conditions.
| Supply voltage | 200–240 VAC, 50/60 Hz |
| Current consumption | Max. 200 mA |
| Recommended motor power | < 15 W |
| Output frequency | 15–80 Hz |
| Isolation voltage | 1500 Vrms |
| Auxiliary voltage output | 5 V, max. 5 mA |
| Control signals | 0–5 V, 0–10 V, or 4–20 mA |
| Recommended potentiometer | 1–47 kΩ |
| Input impedance | 100 kΩ / 150 Ω |
| Direction input level | 4–30 V = ON |
| Direction input impedance | 100 kΩ |
| Start ramp | 1 s (0–100%) |
| Stop ramp | 1 s or 0 s |
| Direction change delay | 0.2 s |
| Connector capacity | 1.5 mm² |
| Operating temperature | 0…+60°C |
| Power loss | Max. 5 W |
| Weight | 80 g (100 g with enclosure) |
| Dimensions (card) | 67 × 86 × 30 mm |
| Dimensions (with enclosure) | 72 × 90 × 60 mm |
| EMC compliance | Tested for household and light-industrial environments |
Ordering larger quantities +100pcs.
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