The Haitronic HS1981-300 speed controller regulates motor speed using feedback voltage from the generator and allows fine adjustment. The speed can be set from 90 to 1,400 r/min at 50 Hz and from 90 to 1,700 r/min at 60 Hz. The direction of rotation is changed by moving the jumper between the “CW” and “CCW” positions.

It is powered by AC 220 V, 50/60 Hz, with a voltage variation of ±10%. Before use, set the external speed control switch to “0”. The operating switch starts and stops the motor without interrupting power to the controller. The motor must come to a complete stop before its direction of rotation is changed.

• Model: US-52
• Power: 300 W
• Power supply: AC 220 V, 50/60 Hz
• Speed range: 90–1,400 r/min at 50 Hz, 90–1,700 r/min at 60 Hz
• Voltage variation range: ±10% Ue
• Operating temperature: -10 to +50 °C
• Relative humidity: below 90%