Shunt trip wiring diagram is an important aspect to consider for electrical professionals as it helps to indicate the exact control circuitry of the shunt trip breaker. Shunt trip breaker wiring diagram explains the same, albeit in a different manner. Primarily, shunt trip circuit breaker wiring diagram can be divided into two parts.
Part 1: How Does a Shunt Trip Breaker Work?
A shunt trip breaker is a type of circuit breaker that, in addition to tripping due to an overload or short circuit, can also be activated remotely via a control system. The control system is usually a low-voltage circuit that is used to trigger the shunt trip breaker. The shunt trip breaker wiring diagram shows how the wiring of the breaker is connected to the control system.
The control voltage is usually 120 or 240 volts AC. The control system can be a simple switch or a more complex control circuit like a PLC or a programmable logic controller. When the control system sends a signal to the shunt trip breaker, the breaker will trip and disconnect the circuit.
A shunt trip breaker has an auxiliary switch that is used to trigger the shunt trip. The auxiliary switch is normally open and is closed when the shunt trip is activated. The shunt trip breaker wiring diagram shows how both the auxiliary switch and the shunt trip coil are connected.
The shunt trip coil is energized by the control voltage. When the shunt trip coil is energized, the auxiliary switch closes and the shunt trip breaker trips.
Shunt trip breakers are used in applications where remote tripping is required, such as in elevator shafts, fire suppression systems, and other safety applications.
FAQ:
| Question | Answer |
|---|---|
| 1. What is a shunt trip breaker? | A shunt trip breaker is a type of circuit breaker that, in addition to tripping due to an overload or short circuit, can also be activated remotely via a control system. |
| 2. What is the control voltage for a shunt trip breaker? | The control voltage is usually 120 or 240 volts AC. |
| 3. Where are shunt trip breakers used? | Shunt trip breakers are used in applications where remote tripping is required, such as in elevator shafts, fire suppression systems, and other safety applications. |
Part 2: Shunt Trip Breaker Wiring Diagram with Explanation
The shunt trip breaker wiring diagram shows how the electrical power enters the circuit breaker panel board and is connected to a single-pole breaker. In this way, the power can be selectively turned off and on for servicing of the elevator.
The single-pole breakers are modified with the addition of an extra pole connected to an external control circuit in the form of a shunt trip. In this way, the shunt trip breaker wiring diagram makes it possible to remotely control the power supply to the elevator by means of a switch located in the elevator’s cab.
The shunt trip breaker wiring diagram is also used in other applications such as in the control wiring of fire suppression systems or in the control wiring of pneumatic HVAC systems.
A shunt trip breaker wiring diagram can be found in the maintenance manual of the specific elevator system in question. The shunt trip circuit breaker wiring diagram is usually located inside the elevator itself or in the machine room near the top of the elevator.
FAQ:
| Question | Answer |
|---|---|
| 1. Where can the shunt trip breaker wiring diagram be found? | The shunt trip breaker wiring diagram can be found in the maintenance manual of the specific elevator system in question. |
| 2. What is the purpose of the shunt trip breaker wiring diagram? | The shunt trip breaker wiring diagram is used to remotely control the power supply to the elevator by means of a switch located in the elevator’s cab. |
| 3. Can shunt trip breakers be used in other applications? | Yes, shunt trip breakers can be used in other applications such as in the control wiring of fire suppression systems or in the control wiring of pneumatic HVAC systems. |
Part 3: Shunt Trip Breaker Wiring Diagram Explanation with Example
Let’s take an example of an elevator system to understand the shunt trip breaker wiring diagram. The elevator control panel houses the shunt trip breaker. The control panel is connected to the elevator cab by means of a multi-conductor cable.
The shunt trip breaker wiring diagram is shown on the inner side of the elevator’s control panel. The control panel is located in the machine room and is easily accessible.
The shunt trip breaker wiring diagram explains how the system is powered and how the control circuitry is connected to the shunt trip breaker. The control circuitry consists of a transformer, a low-voltage switching system, and a governor switch.
The transformer converts the voltage from 120 volts to 24 volts. The low-voltage switching system consists of two switches, one located in the elevator cab and the other located in the machine room.
The governor switch is used to detect the speed of the elevator and to shut off the power if the elevator exceeds a certain speed. The governor switch is connected to the shunt trip breaker via a set of contacts.
The shunt trip breaker wiring diagram also shows the auxiliary contacts that are used to trigger the shunt trip breaker. The auxiliary contacts are normally open and are closed when the shunt trip breaker trips.
FAQ:
| Question | Answer |
|---|---|
| 1. How is the system powered in an elevator? | The system is powered by a transformer that converts the voltage from 120 volts to 24 volts. |
| 2. What is the governor switch used for? | The governor switch is used to detect the speed of the elevator and to shut off the power if the elevator exceeds a certain speed. |
| 3. What are the auxiliary contacts used for? | The auxiliary contacts are used to trigger the shunt trip breaker. |
Part 4: Shunt Trip Breaker Wiring Diagram Explanation with Procedures
In order to install or maintain a shunt trip breaker, the shunt trip breaker wiring diagram must be understood. It is important to understand how the shunt trip breaker works and how it is wired into the control system.
Here are some basic steps for shunt trip breaker wiring diagram installation and maintenance:
- Step 1: Make sure that the power to the control panel is turned off.
- Step 2: Remove the cover of the control panel to access the wiring connectors.
- Step 3: Identify the wiring connection for the shunt trip breaker by referring to the wiring diagram.
- Step 4: Disconnect the wires from the old breaker and connect them to the new shunt trip breaker.
- Step 5: Ensure that all connections are tight and secure.
- Step 6: Replace the cover of the control panel and turn on the power.
It is also important to test the shunt trip breaker after installation to ensure that it is operating correctly. This can be done by activating the shunt trip via the control system and observing the operation of the breaker.
FAQ:
| Question | Answer |
|---|---|
| 1. What are the basic steps for shunt trip breaker wiring diagram installation and maintenance? | The basic steps include turning off the power, removing the cover of the control panel, identifying the wiring connection for the shunt trip breaker, disconnecting the wires, connecting the new shunt trip breaker, ensuring all connections are tight and secure, and replacing the cover of the control panel and turning on the power. |
| 2. Why is it important to test the shunt trip breaker after installation? | It is important to test the shunt trip breaker after installation to ensure that it is operating correctly. |
| 3. How can the shunt trip be activated? | The shunt trip can be activated via the control system. |
Part 5: Conclusion
Shunt trip breakers are an important component of many elevator systems, fire suppression systems, and other safety applications. Understanding the shunt trip breaker wiring diagram is important for anyone who will be performing maintenance or installation on these systems.
The shunt trip breaker wiring diagram provides a guide for the installation and maintenance of shunt trip breakers, ensuring they function properly when needed.
