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2.2 PROTECTION AND CONTROL
Power integrity, safety and management are core elements of the Central Power Hub system. The main chassis features a central
microprocessor which manages all aspects of Central Power Hub operation. At start up it checks the validity of the single (or dual)
power module(s) and then enables them. It then energizes each of the power ports in a carefully coordinated sequence to reduce the
instantaneous load on the power module(s). After start up, each power port is carefully monitored to ensure safety protection while
also maintaining power consistency to the multiple devices:
•
Electronic short protection
- If an overload or short circuit occurs on any output, the power is limited to a safe value (by current
pulsing) until the microprocessor recognizes the overload condition and trips the output – this happens approximately one sec-
ond after the fault happens. Once this occurs, you will need to correct the source of the short circuit and then reinstate the output
either via the front panel CLEAR button or the management application. The other power output ports will remain unaffected dur-
ing this period.
•
5V overload protection
- Where an optional converter dongle is used to supply a 5V device, an extra layer of vigilance is brought
into play. If the load on a dongle exceeds approximately 5.5A, then an internal circuit will trip to protect the power modules and the
cabling. Once the cause is dealt with, a simple toggling of the power port will restore output.
•
Limited power source (LPS)
- Further automated protection circuits within the Central Power Hub unit ensure that it fully complies
with the IEC62368-1 regulation to operate as a Limited Power Source.
Available anywhere, via the in-built Ethernet port, a browser-based management application allows authorized admin users to moni-
tor and control the power module(s) and all of the individual power output ports.
2.3 5VDC CONVERTER DONGLES
Each power output port operates at 12VDC. For devices that use 12VDC, a simple connection cable (ACR1000-3PL-CBL2M) is all
that’s required to link them to each power port. However, numerous Black Box devices operate at a lower voltage of 5VDC and these
each require the use of a converter dongle (ACR1000-12V5-CBL2M) to take the place of the simple connection cable.
