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14.6 MODE 3 & 4 – PWM (Pulse Width Modulation) External Speed or Head Control
Modes 3 & 4 are used for PWM control and feedback according to IEC 60469-1.
Mode 3 stops the pump when the signal is 0% or missing, Mode 4 runs the pump at ll power.
Application:
Using an external PWM signal to control the speed or head of the pump.
Enable / disable control using a separate digital signal.
Terminal Designation Signal Function
SET1 / RUN
PWM-in (PWM input)
Signal frequency: 100 Hz – 10000 Hz (1000 Hz nominal)
Signal load: 5 mA (4 – 6 mA, internally limited)
Signal amplitude: 3.3 – 24 V (threshold at approx. 3V)
COM / 0V Common ground for signals
SET2 / MAX
PWM-out (PWM output)
Signal frequency: 75 Hz (±1 Hz)
Signal drive: Open drain, (100 ohm, 20 mA internal current limit)
Signal amplitude: 0 – 24 V
Signal polarity: Active high (0% - pulled to COM, 100% -open)
SET3 / FB FB (10.5 V) output, can be used to supply SET1 and SET2 bias.
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