Hydraulic Proportional – Pulse Width Modulation

PWM adjusts the average output power to a DC prop. solenoid by switching a fixed DC voltage on-off

On vs. Off time varies, within a fixed period

PWM frequency is typically 100 Hz to 350 Hz, to minimize hysteresis

Frequency must be high enough, so output is not disturbed

Normally a factory setting, but some amplifiers permit user adjustment

PWM is efficient, reducing heat generation


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