The corner actuator and servo are placed on the server
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The exhaust fans here are required to have their speed adjusted based on the pressure inside the furnace; currently, this adjustment is done using angle actuators. These actuators accept 4–20mA input signals. Since there is no servo amplifier available at the moment, it’s not clear whether the angle actuators can be automatically controlled via a DCS system. Additionally, is the servo amplifier a separate unit or is it integrated into the angle actuators?
Is the speed of the exhaust fan controlled by an angular actuator? If the angle actuator has a 4–20mA input, a PID algorithm can be used to control it! The speed of fans is now generally controlled by frequency converters! HONEYWELL’s DCS has a feature called (position-proportional algorithm) that can replace the servo amplifier! This post was last edited by liuei on 2009-4-4 00:22]
You can just control it using DCS. Servo amplifiers are generally used in actuators where only on/off control for forward and reverse rotation is required, but with valve position feedback