ABB Emax 2 Harness Conversion and Auxiliary Module

Conversion Function

Automatic Operating Mode

The Harness system can be put into automatic conversion mode by using the operating mode selection button on the operation panel.

In the automatic conversion mode, the system will automatically detect the two power sources and judge whether the two power sources are normal or not.

When one of the power supply fails, the system will carry out automatic power conversion; at the same time, in order to adapt to the fluctuation of the power grid, the conversion process can support the action delay setting.

Self-input and self-recovery

When one of the two power sources fails, the system will automatically disconnect and switch to the other one to supply power to the load.

When the faulty power supply returns to normal, it will automatically return to the state where the two power supplies are powered separately.

Self-throw without self-recovery

When one of the two power supplies fails, it will automatically disconnect and switch to the other one to supply power to the load.

When the faulted power supply returns to normal, it is necessary to select the self-recovery button or operate manually to return to the state of ‘CB1 closing/CB3 opening/CB2 closing’.

Manual switching of operating modes (non-parallel)

The Harness system can also be operated manually via the control panel, which allows manual control of the CB1 closing/ CB3 opening/ CB2 closing by means of the closing and splitting buttons.

The manual mode of operation is a ‘non-parallel’ mode, which supports electrical interlocking to prevent manual operation. At the same time, it supports the function of disconnection blocking, which guarantees the safety of the power supply system.

The power supply system is safe and secure. The parallel switching mode is used for planned maintenance or power failure of the incoming power supply line.

The CB1/CB2 is operated in the form of a ‘close first, split second’ mode to ensure that there is no interruption of power supply during the conversion process.

(The parallel connection time of power supply 1/2 is not more than 200ms.) At the same time of parallel connection operation, the synchronisation verification module detects the synchronisation condition of the two power supplies.

If the two power supplies are in the synchronous state, the synchronous indicator will light up automatically, and you can enter the manual parallel conversion operation;

If the conditions for parallel connection are not sufficient, the synchronisation indicator goes out, the circuit breaker automatically locks the closing function of the mother switch, and the parallel conversion operation cannot be completed.

Auxiliary functions

The Emax 2 Smart Tripper also contains an internal electrical interlock circuit to ensure the safety of the power supply.

It contains the following

Electrical interlocking function:

- The controller has an embedded logic lock to avoid incorrect closing/closing signals;

- No parallel operation during automatic changeover, the three switches cannot be closed in automatic mode;

- Manual key changeover for ‘non-parallel operation’ ensures no parallel operation and operation, even after partial disconnection of the control line, with safety interlocks to ensure safety.

Optional accessories

The Emax 2 Harness Dual Switching System actuating circuit breakers can be supplied with a wide range of optional accessories.

- Mechanical interlocks

- Opening position locking

- External transformer for earth fault protection

- Communication modules

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