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Actuator operates with either normal or reverse rotation. The stem connected to the output shaft rolls the ball to
open or close the valve.
■
Operational principle
<Circuit diagram>
1.
The valve closes as switched to [S].
The motor stops as LS-1 (limit switch for close operation) connection is turned OFF.
2.
The valve opens as switched to [O].
The motor stops as LS-2 (limit switch for open operation) connection is turned OFF.
NOTE
•
Use an opening-closing indicator lamp circuit suitable for the specifications of power supply.
•
The built-in space heater requires no extra handling because it is installed in the circuit and
works automatically to prevent dew condensation inside the actuator.
•
The label on the cable connector indicates the valve's opening or closing conditions.
The valve is open when the label "O" is shown on the connector.
The valve is closed when the label "S" is shown on the connector.
4. Operation
Actuator
LS1, LS2: Limit switch
C: Condenser
SH: Space heater
M: Motor
TP Thermal protector
7
■EPDT-191a■
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