Why Solenoid Coil Resistance Alone Does Not Prove a Valve Is Healthy
During troubleshooting of a pneumatic dryer system, several solenoid valves were investigated because the expected valve operation was not occurring. The first electrical check was coil resistance. Most coils showed approximately 300 ohms, which initially indicated that the coils were electrically intact. However, resistance measurement alone could not confirm that the complete solenoid valve was functioning correctly. The valve inputs and outputs were then checked by applying the control voltage and observing the actual valve state. ...