ATV312HU15N4 SCHNEIDER

When setting the relay characteristic/torque angle for the three phase directional overcurrent element, a positive angle setting was specified. This was due to the fact that we consider as polarising voltage, the phase voltage value in quadrature of the current under fault conditions. With directional earth fault protection, the residual current under fault conditions lies at an angle lagging the polarising residual earth fault voltage.

Description:

Threaded Connection

Apply Teflon tape to all but the last two threads of male pipe thread. Hand screw the pipe 

into the valve, turning it as far as it will go. Use a wrench to fully tighten the valve to the pipe. 

Do not over tighten or strip the threads.

Inverted Flare Union Connection

Solder fittings onto pipe. Use solder with melting point below 600 °F. Mount valve to union 

nuts.

Installing Actuator on Valve Body

Slowly latch the manual operating lever in the open, engaged position (AG1 or AH1 only). 

Depress the release button (see Figure-7). Align the body with the actuator to ensure the 

stem is inserted into the large mating hole on the bottom side of the actuator. Engage the 

actuator on the body and release the button.

q C A U T I O N 

Do not use the valve body to manually open the actuator as damage to the valve actuator 

will result.

CHECKOUT

1. Make sure the valve stem rotates freely before and after installing the actuator.

2. If the stem does not operate freely it may indicate that the stem was damaged and may 

require that the valve be repaired or replaced.

3. After the piping is under pressure, check the valve body and the connections for leaks.

4. After the valve and actuator are installed, power the actuator and check the operation.

THEORY OF OPERATION

PopTop Series are two position spring return valves. When powered, the actuator moves to 

the desired position, tensing the spring return system. When power is removed the actuator 

returns to the normal position.

PopTop Series two position spring return valves can be purchased with an optional built-in 

auxiliary SPDT end switch for interfacing or signaling; for example, zone pump burner 

control.

MAINTENANCE

PopTop Series two position spring return valves are maintenance free. Replace defective 

modules. Actuator may be replaced without removing the valve.

Regular maintenance of the total system is recomended to assure sustained, optimum 

performance.

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