7-3
7.3
Selecting the operation of the inflow solenoid valve
You can select the operation of the inflow solenoid valve with the
Solenoid
valve
operation
selector
switch on the operation panel.
Note that setting the Tank Selection to “No tank” disables these settings.
Table 7-3 Solenoid Valve Operation setting
Man.
Open
Man.
Close
Auto
“Man. Open”
The inflow solenoid valve is normally open.
Man.
Open
Man.
Close
Auto
“Man. Close”
The inflow solenoid valve is normally closed.
Man.
Open
Man.
Close
Auto
“Auto”
The inflow solenoid valve is automatically controlled depending on the
level of the water tank.
Except for selecting “Man. Close,” the system enables the setting in one second after the indicator light
comes on.
Note
For the electrode circuit and the solenoid valve circuit to be used, see Table
4-3-2.
Setting the Tank Selection to “No tank” turns off all the indicator lights for the
Solenoid Valve Operation setting and disables the operation of the solenoid
valve.
Then, if you change the Tank Selection to any options other than “No tank,” the
system automatically seletcts the Solenoid Valve Operation to “Man. Close.”
Whether the solenoid valve is normally open or normally closed while
energized depends on the solenoid valve type (Parameter P103) setting.
Fig. 7-3 Electrodes for automatic control of the solenoid valve
Caution
Provide a ground electrode dedicated to the electrodes for the inflow
solenoid valve.
Tank #1:
Tank #2:
1N1 1N2
2N1 2N2
1E3
2E3
Open
Closed
Ground
