Technical FAQs
Technical FAQs
Below are the accuracy specifications in regards to the load:
Range |
Accuracy |
---|---|
0-1A |
+/- 1.0A |
1-10A |
+/- 0.5A |
>10A |
+/-5% A |
Also, as of Rack PDU (rpdu) firmware >3.3.1, attached loads < 1 amp will always display as 0 amps on the PDU's LCD and network management card, regardless of the load. Lastly, readings via the Rack PDU's network management card will give measurements in decimal format. ie. 1.6 amps as opposed to 2 as seen on the Rack PDU's LCD.
For AP84XX and AP86XX SKUs with individual outlet metering, outlet current measurements less than 0.5 amps and outlet power measurements less than 50 watts will be rounded down to zero.
rpdu2g firmware v5.1.2, v5.1.6:
rpdu2g firmware v6.0.9 and above:
- Phase/Bank/Outlet Current - squelched to 0A under 0.5A.
- Device/Phase/Outlet Power - squelched to 0 watts if corresponding current is squelched.
- Outlet Energy - Will NOT be accumulated if corresponding outlet power/current is squelched.
- Device Energy - Will always accumulate, since the unit does consume a very small amount of energy within the internal circuitry.
- Outlet Current - squelched to 0A under 0.3A.
Note: Accuracy is not defined below 0.5A.
- Phase/Bank Current - squelched to 0A under 0.5A.
- Device/Phase/Outlet Power - squelched to 0 watts if corresponding current is squelched.
- Outlet Energy - Will NOT be accumulated if corresponding outlet power/current is squelched.
- Device Energy - Will always accumulate, since the unit does consume a very small amount of energy within the internal circuitry.
Functional Specifications - Metering | |
Input Metering Range | 0.5 to Rated Input Current |
Outlet Metering Range | 0.3 to 16.0A |
Allowable Crest Factor | 1.75 |
Accuracy (Phase Current) | +/- (3% + 1 digit) |
Accuracy (Phase Voltage) | +/- (3% + 1 digit) |
Accuracy (Phase Power) | +/- (3% + 1 digit) |
Accuracy (Phase Energy) | +/- (3% + 1 digit) |
Accuracy (Outlet Current) | +/- (3% + .1Amp) |
Accuracy (Outlet Voltage) | +/- (3% + .1Volt) |
Accuracy (Outlet Power) | +/- (A reading * V error) + (V reading * A error) |
Accuracy (Outlet Energy) | +/- (A reading * V error) + (V reading * A error)*hours |
Accuracy (Bank Current) | +/- (3% + 1 digit) |
Note: It is possible that a higher level measurement will show a load (such as bank or device), even when a lower level measurement is showing zero. (For instance, the phase current could show 0.8A, even though the bank currents are squelched to zero.)
Rack ATSs (AP44XX - fourth generation) have an accuracy of +/- 3% of reading, +/- 1 least significant digit.
ats4g firmware 6.4.6 and above:
Current measurements of less than 0.5 amps and corresponding VA measurements are rounded down to zero.
Note: The current ATS firmware is mistakenly squelching measurements under 1A, thus showing 0A. This will be addressed in a new firmware release.
Functional Specifications - Metering | |
Input metering range | 0.5A to Rated Input Current |
Total current metering range | 0.5A to Rated Input Current |
Per bank metering range (2U units) | 0.5A to Bank Rated current |
Allowable crest factor | 1.4 - 1.75 |
Allowable power factor | 0.9 - 1 |
Accuracy (Source Current) | ± (3% + 1 digit) |
Accuracy (Source Voltage) | ± (3% + 1 digit) |
Accuracy (Output Current) | ± (3% + 1 digit) |
Accuracy (Bank Current - 2U units) | ± (3% + 1 digit) |
Accuracy (Apparent Power VA) | ± (3% + 1 digit) |
Allowable frequency deviation | 3/5/10Hz |
Note: If you are connecting a small load to the ATS and it is reporting 0A it is likely the ATS is squelching the value as per the explanation provided above. Increase the load attached to the ATS output and the unit will start showing values higher than 0A.
How to verify your PDU or ATS NMC firmware version:
Navigate to the Administration tab->General->About page or the About->Network in the web UI or via local/telnet/SSH interface(s) by logging in and checking the top right of the screen or entering the about command in the CLI.