KBox A-150-SKL - User Guide Rev. 1.1
// 50
Power Specification
10.6.
The KBox A-150-SKL must be supplied with a nominal input voltage of 24 VDC from an external power supply that
connects to the front panel DC input power connector using the supplied DC mating power connector (PSC 1,5/ 3-F)
wired as described in Chapter 8.3: Wiring the DC Mating Power Connector.
Use an appropriate Power Supply Unit (PSU) that meets the product’s power specification and can supply the
maximum required power consumption.
Table 12: Power Specification
Input Voltage (nominal)
24 VDC
Input Voltage (range)
9 VDC to 30 VDC
Input Current
4.4 A max.
Inrush Current
6 A max.
To protect the product against fluctuations and interruptions in the delivered DC power supply, observe proper power
protection requirement.
Do not disconnect the power from the system while the system is switched on!
Performing a forced shut down can lead to loss of data or other undesirable effects!
10.6.1.
Power Protection Requirements
When deciding on an appropriate Power Supply (PSU) consider general power protection features that protect
electrically powered products against fluctuations and interruptions in the delivered AC mains supply voltage.
Operation without loss of data or damage to the product must also be considered:
For critical applications requiring continuous operation, use an uninterruptible PSU to provide constant power
even during AC power loss.
To ensure an orderly shutdown without loss of data use a PSU with pre-longed operation during AC power loss
(approx. 5 min).
In user environments where power spikes are common, use a PSU with overvoltage protection to prevent power
spikes from damaging internal components and causing system failure.
Unintentional voltage drops in the electrical mains power supply that drop below the supported operating level
cause a power outage (brownout) that can damage the product and cause loss of data. Use a PSU with a
sufficient holdup time to avoid brownout. PSUs with a longer holdup time allow for a longer power outage time
without the power to the product dropping below the required operating level.
If there is an unintentional voltage drop in the electrical mains power supply for longer than
the PSU’s specified holdup time (brownout), then all supply voltages should be shut down
and remain in the off state long enough to allow internal voltages to discharge sufficiently.
Failure to observe this off state time means that parts of the product or attached
peripherals may work incorrectly or suffer a reduction of MTBF.
The minimum off state time, to allow internal voltages to discharge, depends on the
implemented PSU and additional electrical factors. To determine the required off state time,
each case must be considered individually. For more information, contact Kontron Support.
