A pressure switch is a device designed to control the pressure of a fluid or gas within a system. Pressure switches can be used for a wide range of applications, from monitoring the pressure in a hydraulic system to controlling the pressure of the air in a compressor. One of the most common uses of a pressure switch is to control the starting and stopping of an electric motor. In this article, we will discuss the wiring diagram for a 3 phase pressure switch and how it works.
What is a 3 Phase Pressure Switch?
A 3 phase pressure switch is used to control the starting and stopping of a 3 phase motor. These switches are designed to monitor the pressure in a fluid or gas system and activate or deactivate the motor based on the pressure readings. The switch has a set point that is set to the desired pressure, and when the pressure exceeds or falls below this set point, the switch will activate or deactivate the motor.
How Does a 3 Phase Pressure Switch Work?
The 3 phase pressure switch is connected in series with the motor, and when the set point is reached, it will open or close the circuit, turning the motor on or off. The switch is powered by the same phase as the motor and has a control voltage typically between 120-480 volts AC. The switch will often have a visible display to indicate the pressure readings and status of the switch.
3 Phase Pressure Switch Wiring Diagram
The wiring diagram for a 3 phase pressure switch is fairly simple. There are typically three wires: one for the common, one for the normally open (NO) contact, and one for the normally closed (NC) contact. The common wire is typically connected to one of the three phases, and the other two wires are connected to the NO and NC contacts respectively. The NO contact is connected to the starter coil, and the NC contact is connected to the overload relay.
Table of Wiring Diagram For 3 Phase Pressure Switch
| Wire Color | Function |
|---|---|
| Black or Red | Common Wire/Power Input |
| Blue or Yellow | Normally Open Contact (NO) |
| Brown or Orange | Normally Closed Contact (NC) |
It is important to note that the wire colors may vary depending on the manufacturer and model of the pressure switch. Always refer to the wiring diagram provided by the manufacturer for accurate wiring instructions.
FAQs
What is the function of a 3 phase pressure switch?
A 3 phase pressure switch is used to control the starting and stopping of a 3 phase motor by monitoring the pressure of a fluid or gas system.
How do I wire a 3 phase pressure switch?
The wiring diagram for a 3 phase pressure switch is simple. Connect the common wire to one of the three phases, and connect the NO and NC contacts to the starter coil and overload relay respectively.
What is the difference between NO and NC contacts on a pressure switch?
The NO (normally open) contact is activated when the set point is reached, while the NC (normally closed) contact is deactivated when the set point is reached. The NO contact is typically used to activate the starter coil, and the NC contact is used to deactivate the overload relay.
Why is it important to refer to the wiring diagram provided by the manufacturer?
The wire colors and wiring instructions may vary depending on the manufacturer and model of the pressure switch. Always refer to the wiring diagram provided by the manufacturer for accurate wiring instructions.
Can I use a 3 phase pressure switch for a single phase motor?
No, a 3 phase pressure switch is designed to control the starting and stopping of a 3 phase motor. For a single phase motor, a different type of pressure switch must be used.
Conclusion
Understanding the wiring diagram for a 3 phase pressure switch is crucial for proper installation and operation. Always refer to the wiring diagram provided by the manufacturer for accurate wiring instructions, and follow all safety guidelines when working with electrical equipment. With proper installation and maintenance, a 3 phase pressure switch can provide reliable control of a 3 phase motor for a wide range of applications.
