ACB technology

ACB technology

Redundant up to the load

Active redundancy modules with ACB technology ensure the permanent, redundant power supply of your load.

In systems with the highest safety requirements, redundant power supplies ensure that the failure of a power supply unit does not result in downtime. Here, potential sources of error, from the supply cable and power supply to the load, should also be monitored.

Auto current balancing (ACB)

QUINT ORING power supply  

Symmetrical distribution of the load current

The ACB technology of the QUINT ORING modules ensures the symmetrical loading of the power supplies.

The input voltage difference between the power supplies is continuously determined and automatically compensated up to a deviation of 300 mV. The load current is therefore distributed symmetrically.

Thanks to the use of modern MOSFET technology, the resulting thermal load is reduced by up to 70% compared to using a conventional diode. This lower level of power dissipation ensures that all the control cabinet components stay cooler and the device service life is increased.

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Keeping everything in balance

Bar graph display of a QUINT ORING power supply  

Display of symmetrical utilization on the device

A bar graph indicates the symmetrical utilization of the power supplies. The user can see at a glance which input voltage is higher and therefore which power supply is under a greater load.

Various states can be easily read, problems can be detected quickly and soon rectified. Their display and representation are as per NAMUR recommendations.

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Permanent redundancy monitoring

LED indicator floating signal contact on a QUINT ORING power supply  

Complete monitoring of redundancy

The QUINT ORING modules monitor the load current and generate a warning as soon as a set value is exceeded.

If the user connects additional loads to a redundant power supply as part of a system expansion, this can result in the loss of redundancy.

This is illustrated in the example scenario described below.

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Example scenario

Scenario: redundant use of power supplies  

Example 1: redundancy OK, example 2: no redundancy

Two redundant power supplies each with 5 A nominal current supply a controller with the 5 A required.

If an additional load of 3 A is connected, this can be supplied by the power reserve of the power supply. The required current of 8 A is provided with no voltage dip.

However there is no longer any redundancy: if one of the two power supplies fails, the second device is no longer able to provide 8 A. The LED immediately signals to the system operator that redundancy is no longer available.

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