I want to temporarily bypass a normally open low pressure sensor upon starting a pump. Because there is no pressure, the sensors logic is 0 or OPEN. When When there is pressure above 5psi, the switch will CLOSE.
The sensor is in series with the 120VAC circuit, in which will de-energize coil if pressure drops.

Goal: I can probably have a momentary push button in which I can hold to short-out sensor upon starting (DONT LIKE)

Can I use a time delay relay to energize an auxiliary relay/contact to short out sensor.

Any other ideas on how to temporarily short-out sensor upon start? Otherwise, pump will not start.


Thanks

 

Note: This circuit pulls in contacts for 480V pump circuit.

 

A standard well pump under / over pressure switch has a lever attached
to bellows. When pressure is under user rotates a lever that manually
closes contacts to pump starting it. As pressure rises bellows inflates and
slowly takes off required torque on lever until user no longer has to hold it.
Then pump runs from a low pressure setpoint to high, shuts off, and cycle
is repeated w/o user intervention when pressure drops , but not all the
way to kill pump due to total loss of pressure.

Regards, Dana.

 

A standard well pump under / over pressure switch has a lever attached
to bellows. When pressure is under user rotates a lever that manually
closes contacts to pump starting it. As pressure rises bellows inflates and
slowly takes off required torque on lever until user no longer has to hold it.
Then pump runs from a low pressure setpoint to high, shuts off, and cycle
is repeated w/o user intervention when pressure drops , but not all the
way to kill pump due to total loss of pressure.

Regards, Dana.

This would be ideal. However, there is already an existing lp cut-off switch in which I intend to use somehow

 

The discharge pressure is less than 10psi. The pumptrol is meant for higher pressures.

 

This relay circuit should do it but you need a wall wart power supply or battery to operate the relay.

 

This relay circuit should do it but you need a wall wart power supply or battery to operate the relay.
View attachment 154322

This is great. However, I do not want the pressure switch to remain shorted. Upon reaching a pressure greater than 3psi, I want the switch to NOT be shorted. Under a low prrssure condition, the switch will disengage a latch circuit, resulting in the pump shutting down.

 

It only bypasses when you press the switch to get it started.

 

It only bypasses when you press the switch to get it started.
View attachment 154338

Then all you need is a switch across the contacts as the relay serves no purpose.
But the TS stated he did not want to have to hold the start button for that long.

Just use a time-delay relay as the TS suggested.

 

Then all you need is a switch across the contacts as the relay serves no purpose.

Goal: I can probably have a momentary push button in which I can hold to short-out sensor upon starting (DONT LIKE)

He didn't want to switch 480 volts.

 

He didn't want to switch 480 volts.

Of course not.
The pressure switch controls 120v which controls a relay that switches the 480V to the motor.
Read all the posts.

He just doesn't want to have to hold the start button until the pressure builds up above the its pressure setting.