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)
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.
Keeping everything in balance
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.
Permanent redundancy monitoring
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.
Example scenario
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.
Automatic detection and indication
All power supplies in the QUINT POWER series from Phoenix Contact are suitable for implementing this concept. Redundancy is ensured because the second power supply continues to supply the entire load if the first device is unable to supply output voltage.
The errors and faults described below are detected and indicated by the QUINT POWER power supply and the QUINT ORING module.
For further information, please click on the images
Error in a phase of the supply network
The parallel connected power supplies are operated on different phases. Failure of or a fault with one of the phases therefore does not affect the supply of the load. The green LED on the power supply (DC OK) is off. There is no redundancy at the load. Auto current balancing is no longer performed. The LED (Redundancy OK) and a segment of the bar graph display (ACB OK) flash green.
Short circuit or cable break in the supply cable to the power supply
This error does not affect the supply of the load. The second power supply continues to reliably supply the connected loads. The green LED on the power supply (DC OK) is off. There is no redundancy at the load. Auto current balancing is no longer performed. The green LED (Redundancy OK) and a red segment of the bar graph display (ACB OK) flash.
Failure of a power supply
The failure of a power supply does not affect the supply of the load since the second power supply continues to reliably supply the connected loads. The green LED on the power supply (DC OK) is off. There is no redundancy at the load. Auto current balancing is no longer performed. The green LED (Redundancy OK) and a red segment of the bar graph display (ACB OK) flash.
Short circuit between the power supply and redundancy module
This error does not affect the supply of the load since the second power supply continues to reliably supply the connected loads. The green LED on the power supply (DC OK) flashes. There is no redundancy at the load. Auto current balancing is no longer performed. The green LED (Redundancy OK) and a red segment of the bar graph display (ACB OK) flash.
Cable break between the power supply and redundancy module
This error does not affect the supply of the load since the second power supply continues to reliably supply the connected loads. The green LED on the power supply (DC OK) is steady on. There is no redundancy at the load. Auto current balancing is no longer preformed. The green LED (Redundancy OK) and a red segment of the bar graph display (ACB OK) flash.
Faulty redundancy module
Self-monitoring detects and indicates the faulty redundancy module. This enables quick servicing in order to restore redundancy. The green LED on the power supply (DC OK) is steady on. There is no redundancy at the load. Auto current balancing is no longer preformed. The green LED (Redundancy OK) flashes and the middle segment of the bar graph display (ACB OK) is steady red.
Cable break between the redundancy module and the load
Two positive output terminal blocks enable consistent redundancy. Reliable supply of the load is ensured.
Load current too high
A faulty load or subsequent installation of additional loads can increase the load current. If the value that a single power supply can deliver is exceeded, redundancy is no longer possible. The green LED on the power supply (DC OK) is steady on. There is no redundancy at the load. Auto current balancing is no longer performed. The green LED (Redundancy OK) flashes and a red segment of the bar graph display (ACB OK) flashes.
PHOENIX CONTACT (Ireland) Ltd
Calmount Park
Ballymount
Dublin 12
D12 XE18
Ireland
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