WHAT IS AN AUTOMATIC TRANSFER SWITCH?

One piece of electrical equipment dedicated to managing a backup generator is an automatic transfer switch. The automatic transfer switch panel is often housed in a suitably sized metal cabinet structure. On the top side of the door, an automatic transfer switch controller and its ancillary instruments are placed accordingly.

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In technical terms, we use the acronym ATS. It stands for an automatic transfer switch. In other words, an ATS panel is a metal cabinet that hosts an automatic transfer switch of a suitable size for your standby generator.

IN THIS VIDEO WHAT IS AN ATS PANEL
WHAT IS AN automatic transfer switch?

There is an abyssal difference between ATS panels and general-purpose generator control panels. The generator control panel only has the basic function of starting the engine and providing real-time protection to prevent severe damage to the engine or generator. The ATS panel additionally features power relays, transfer switches, transformers, electronic boards and all ancillary circuits to connect your load to utility power.

AUTOMATIC TRANSFER SWITCH  PANEL PRICE LIST


HOW TO CONNECT A PORTABLE GENERATOR TO YOUR HOUSE?

The common answer is to use an automatic transfer switch. But, if you have a portable generator without a battery you must install an automatic transfer switch panel of a special kind.

FOLLOW THE VIDEO AND THE TUTORIAL ON ITS LINK

HOW TO CONNECT A PORTABLE GENERATOR TO YOUR HOUSE WITH AN automatic transfer switch?


WHAT KIND OF GENERATOR CAN YOU USE WITH OUR ATS PANEL?

Our automatic transfer switch panels support any style of engine and generator. You can upgrade a second-hand generator by using our automatic transfer switch panel.

what kind of generator can I connect to the automatic transfer switch?

.The internal interface board of our automatic transfer switch panels features all relays that interface with all kinds of engines. In other words, you do not need any controller fitted with your generator. Our automatic transfer switch panel will take care to control all functions. If you have a really old generator, make sure that the electric start and electric stop work fine. In the worst case, you will use two automotive relays to interface with the engine as shown in the below picture

how to connect an old generator


THIS AUTOMATIC TRANSFER SWITCH PANEL DOES NOT NEED A GENERATOR CONTROLLER

OUR ATS PANEL WORKS WITH OLD AND SECOND HAND GENERATOR WITHOUT CONTROLLER

WHY DOES USING OUR AUTOMATIC TRANSFER SWITCH  PANEL EXPONENTIALLY INCREASE THE LONG-TERM RELIABILITY OF YOUR STANDBY GENERATOR?

This is because of a big misunderstanding about overvoltages and flashes of lightning. The low-cost AMF controllers on the market are erroneously placed on the frame of generators. This forces the user to connect the wires of the mains to the controller inside the generator. Despite all your efforts, you will never get protection from the electronic boards. This is because you will not be able to reduce to zero the parasitic capacitance of the wires.

NEVER DO LIKE THIS WITH ATS PANEL

It is a money-saving practice to connect the cables of the mains directly to the AMF controller.

WRONG ATS PANEL CONNECTION

This is an unsafe practice. Forget about it!

 CONNECT THE ATS PANEL IN THIS WAY

In this way, overvoltages will never hit your generator!

SAFE WAY TO CONNECT AN ATS PANEL

The controller Be242 will protect your generator from mains surges, You can optionally use your auto-start module, or use the normal input-output lines of the Be242 controller.


WHAT IS THE DIFFERENCE BETWEEN AN AUTOMATIC MAINS FAILURE AND AUTOMATIC TRANSFER SWITCH PANEL?

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The main difference is that an AMF panel features a CONTACTORS-BASED changeover switch. The automatic transfer switch panel features a MOTORIZED SWITCH-BASED changeover solution. Due to the high cost of the contactors, for large power, it is common sense to manufacture AMF panels up to 80kVA. Over 80kVA we manufacture ATS panels.

ATS PANEL VERSUS AMF PANEL


CONTACTOR-BASED CHANGEOVER VERSUS MOTORIZED SWITCH-BASED CHANGEOVER

You will achieve granular control monitoring and protection of your emergency generator by using two contactors with mechanical interlocks

ATS PANEL WITH CONTACTORS CHANGEOVER.jpg

The contactors, usually four-pole, are coil-operated switches that close a circuit when the excitation coil is supplied with alternating 230V. To keep the contactor in its closed position, it is therefore always necessary to supply the coil. The average consumption is 1oWatt per small contactor but reaches 20 watts for large contactors. This will increase your electricity bill. The life of the coils is expected to be several years. When a coil fails, the contactor does not activate. You must replace the coil. It is not an easy job. Finally, the price of these contactors is reasonable up to a power of 60KVA.

ATS PANEL WITH MOTORIZED CHANGEOVER.

Above this threshold, the contactors are very expensive. There you are are the panel prices with a contactors scheme up to 60kVA. The great advantage of automatic transfer switch panels with contactors, often called AMF PANELS, is the ability to protect the load very well. They can therefore intervene in switching the network and the generator based on complex settings of timers and priority thresholds. For this reason, the panels equipped with contactors are called AMF panels (Automatic Mains Failure).


HOW TO USE THE ATS PANEL?

Our automatic transfer switch panels are based on the Be242 and BeK3 controllers. These are user-friendly controllers. In this example, we describe the way to use the Be242 controller. The BeK3 is strictly similar.

Push the AUTO button. The ATS controller will automatically manage all tasks. The MANUAL button always overrides the automatic way of operation but, in the background, the basic protections will be always active avoiding dangerous situations. The Be242 is a combined ATS, AMF, and generator controller. It offers a large flexibility of use. You can manually start and stop the engine. You can manually control the changeover switch.

THE LOAD IS CONNECTED TO THE MAINS

load connected to utility power

THE LOAD IS CONNECTED TO THE GENERATOR

load connected to generator

PUSH THE AUTO BUTTON TO LET BE242 DOING ITS BUSINESS

the auto button

The Be242 is programmed in the factory according to the size of the panel. You may need to adjust some settings in a way that you adapt the panel to your application. The programming is really simple. You can do it by using the navigation buttons on the front panel of the controller. You can download the

ATS CONTROLLER INSTALLATION MANUAL

You can connect the panel to any engine. The internal interface board features all the relays you need to start and stop the engine. You can connect the automatic transfer switch panel to a generator fitted with any auto-start module as well.


HOW DO YOU CONNECT TWO GENERATORS IN A STANDBY CONFIGURATION?

By using the Be242 automatic transfer switch PANEL you can program the configurable inputs and outputs committed to manage the priority of the start. This is the typical duel generator configuration.

DUAL GENERATOR TO ONE LOAD CONFIGURATION


HOW TO SERVE TWO SEPARATE BUILDINGS WITH THE SAME STANDBY GENERATOR?

Forget to use complex PLC when you have to make this kind of application. It is about the DAUL-LOAD configuration, You simply program this function into the adjustable input-output of the controller.

ATS PAELS DUAL LOAD CONFIGURATION


A BEK3-BASED AUTOMATIC TRANSFER SWITCH PANEL

Over 80kVA we manufacture ATS panels with motorized changeover switches. An ATS panel with power between 80kVA to 160kVA features the BeK3 controller. Here is an example of a generator control panel fitted with a BEK3 controller [1]. The panel controls the engine via the programmable input-output lines [4]. The BEK3 interfaces with switches fitted to the frame of the generator [3]. The generator control panel is connected to the alternator via a power cable of a suitable size. According to the mode of operation, the BEK3 controller drives the status of the internal power circuit breakers.

A BEK3-BASED ATS PANEL OFFERS REMOTE CONTROL MONITORING

The controller features MODBUS and CANBUS (SAEJ1939 compatible). You can use traditional standard engines by using the programmable input/output lines if CANBUS is not available. The panel includes miscellaneous equipment: a battery charger, electronic circuit boards,  power relays, and terminal blocks. The BeK3 controller is conveniently tasked with driving the contactors. These BEK3-based panels feature IP62 ingress protection.


A BeK3-BASED ATS PANEL OFFERS MONITORING OPTIONS

ATS PANEL FEATURES GSM AND TCP/IP MONITORING

The BeK3 automatic transfer switch offers superior remote control monitoring capabilities over any competitors. We offer solutions to monitor fuel levels via GSM, TCP/IP and MODBUS. We offer free of charge software tools.


WATCH THE BE242 PRESENTATION VIDEO

THE BE242 ATS CONTROLLER

A BE242-BASED ATS PANEL FEATURES:

UTILITY POWER  OVER-UNDER VOLTAGE AND FREQUENCY MONITORING

GENERATOR OVER-UNDER VOLTAGE AND FREQUENCY MONITORING

OVERLOAD MONITORING

BATTERY MONITORING

INTERFACES WITH THE ENGINE

  INTERFACES CONTACTORS

INTERFACES TRANSFER SWITCHES

ADJUSTABLE OVERLOAD PROTECTION

OVER 70 ADJUSTABLE SETTINGS

USER-FRIENDLY INTERFACE

WIDE OPERATING TEMPERATURE RANGE


PURCHASE  THE BE242 UNIVERSAL AMF ATS CONTROLLER


ATS PANEL WORKING PRINCIPLE 

The automatic transfer switch panel is conveniently tasked with driving the switching of your load to mains or generators. Even though the power configuration and general arrangement are the same for all panels, the input-output lines for the engine connection and ancillary equipment depend on the type of controller fitted to the panel. The automatic transfer switch panel continuously monitors the status of the utility power. You can set low/high limits for Voltage and Frequency. In other words, when the voltage and the frequency are within the limits, the automatic transfer switch panel connects the load to the utility power. If the voltage drops below the lower limit (or rises above the high limit), the automatic transfer switch panel will disable the utility power circuit. This prevents, after a programmable delay, severe damage to your load. If the failure persists over the programmed time, the ATS panel will instruct the generator to start.


BEFORE CONNECTING YOUR LOAD 

The automatic transfer switch panel does its business to check the quality of the generator voltage and frequency. Once it detects that the parameters are within the programmed limits, the automatic transfer switch panel will connect the generator circuit to your load. During a power outage, the automatic transfer switch panel monitors the utility power. When the utility power parameters return within the programmed settings, the automatic transfer switch panel will transfer the load to utility power. This will happen after a delay that will ensure that the utility power is in stable conditions. The engine will run offload after connecting your load to the utility power. Then, the engine will stop and the automatic transfer switch panel is ready for a new power outage.


 THE ATS PANEL WIRING DIAGRAM

In the following wiring diagram, you can see all the details about an automatic transfer switch panel. Even though the size of the wires, contactors, transfer switches or changeover, cabinet size, and terminal blocks, depend on the ATS panel power rating, the ATS panel wiring is the same. Download the following documents to find all the answers you are looking for.an ATS PANEL WIRING DIAGRAM


ARE YOU LOOKING TO DEVELOP YOUR OWN BUSINESS IN MAKING ATS PANELS?

GREAT WE ARE HERE TO HELP YOU

When you want to make an ATS panel, install in a metal box the Be242 ATS controller, a changeover switch, a battery charger, and a set of terminal blocks. Put current transformers if you are willing to set up the overload protection. If you use the Be242, you no longer need other components when making an ATS panel. The result is an enormous saving in time, materials and money!

OPEN THE WEB TUTORIAL PAGE

Using the Be242 controller you can afford to make your own ATS panels. The controller is designed to simplify the process of manufacturing,

HOW TO MAKE AN ATS PANEL TUTORIAL


BERNINI DESIGN SRL

Zona Industriale

46035 Ostiglia

Italy

 VAT IT01453040204

bernini@bernini-design.com

+39 335 7077148

 

 

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