The high current pull of an open AC
solenoid is familiar as inrush current. And the current pull when the solenoid
is closed is known as holding current. AC solenoids can only disperse the heat
generated by their holding current. This means it's very significant for the
plunger to close entirely when an AC solenoid is stimulated , otherwise the
coil will exhaust.
In AC electric coils the opposition or
resistance of the coil is lowest when the hydraulic solenoid valves is open, i.e. when the
plunger is out. Resistance expands as
the plunger is dragged into the closed position. As a result, the current draw
of an AC solenoid is maximum when the solenoid is open and lowest when the
solenoid is closed.
In other words, the high inrush
current produces more heat than can be constantly loose by the solenoid. So if
the plunger is unable to be entirely pulled into its coil - due to a mechanical
problem with the valve for example, then the insulation around the coil wounds will
burn and the coil will short out.
Read more about Hydraulic Solenoid Valves
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