How to Connect a 3-Phase Pressure Switch

How to Connect a 3-Phase Pressure Switch

A 3-phase pressure switch is an important part of any air compressor and helps ensure that the system is operating properly. It tells the compressor motor to start and stop when a specified pressure threshold is reached. It can also be used in HVAC equipment, gas flow control systems and process equipment.

How to Connect a 3 Phase Pressure Switch

In order to connect a 3-phase pressure switch, you need an electrical service with three separate insulated wire conductors that are each connected to a 3 phase power supply. A 120/240 volt single phase panel that is found in homes and small businesses only produce 2 lines of electrical power, and therefore cannot provide the necessary current for a 3 phase motor.

How to Wire a 3-Phase Motor

Most 3 phase motors draw a lot of amperage when they first start, so they require a motor starter in order to prevent them from overheating or shutting down prematurely. A motor starter is typically made up of a low oil switch, motor starter coil, and overload relay.

The low oil switch would be wired to the pressure switch, and then the motor starter coil would be wired to the motor start relay. This way, when the pressure switch triggered, the motor starter would be activated, and the motor would immediately start up.

How to Connect a 3phase Motor

The motor starter is made up of a 3 phase wired coil, and it can be connected to the pressure switch, or directly to the motor. The pressure switch should have an AUTO/OFF lever, so that it can be manually activated or deactivated when needed.

How to Wire a 3 Phase Motor

When wiring a 3 phase motor, you need to make sure that you use a high quality circuit breaker. If you don’t, you could end up with a big mess on your hands and damage to your expensive equipment.

How to wire a Three Phase Electric motor

The easiest way to control a three phase electric motor is to use a 3 phase electrical drive (variable frequency drive). Most of these drives have a 1 phase input power and then convert that to a 3 phase output voltage. You can then connect the motor to this output to get better torque and power saving, and speed controlled.

How to Control a Three Phase Electric Water Pump

A three phase water pump can be controlled with the use of a three phase pressure switch, however, there is not enough space on these pumps for this type of device. A single phase float switch may be all that is needed to achieve the desired result.

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