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5.2 RESTORING POWER OUTPUTS
As discussed in the Welcome section, the Central Power Hub ports are 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. The resulting trip is indicated on the Central Power Hub front panel by the OVLD being on and also
within the management application (‘FAULT’ is shown next to the affected port within the Status & Control page).
• 5V overload protection - Applicable only to outputs that use optional Converter dongles. When the load exceeds approximately
5.5A*, a dongle will internally trip its power output. In most cases this will occur before the electronic short protection (mentioned
above) reacts. In such cases, the power trip will not be reported back to the Central Power Hub unit and its output will remain
intact, although the listed current output for that port will fall to (or near) zero.
5.2.1 TO RESTORE A POWER OUTPUT
1 Following an automatic power trip, your first task is to locate the cause of the problem. It may have been a temporary overload
issue that has subsided or something more permanent. Perform thorough checks on the implicated device and all of the power
cabling between it and the Central Power Hub.
2 Depending on where the trip was made, you will see different results:
• If the Central Power Hub electronic short protection circuit responded, the front panel
OVLD
indicator will be lit and also the
rear panel green indicator adjacent to the affected port will be
OFF
. Within the Status & Control page of the manager applica-
tion, the port State will be shown as FAULT.
• If the converter dongle overload circuit responded, it is likely that the corresponding Central Power Hub output port will still be
active.
3 Accordingly, your remedial actions will differ:
• Where the fault is indicated on the front panel
OVLD
indicator (once you have diagnosed and corrected the cause), use a nar-
row implement (e.g. straightened paperclip) to press and release the recessed front panel CLEAR button. The power output to
port will be reinstated. Alternatively, within the management application (Status & Control page), click the FAULT state shown
against the affected port.
• Where the fault was detected by a converter dongle, either use the Status & Control page of the management application to
switch the port Off and then On; or at the Central Power Hub rear panel remove and reconnect the converter dongle connec-
tion.
4 For a suitable period after resuming the power supply to the affected port, closely monitor the device, the Central Power Hub and
all related cabling for a reoccurrence of the same or similar problem.
* If you are using the management application to monitor supply currents, remember that due to the conversion from 12VDC to
5VDC, the values shown at the power output ports (within the app) differ from the currents flowing to the device. Roughly speaking,
5.5A at the 5V level will be reported at the management application as 2.3A at 12V.
