PDU-1508 energy accumulator/consumption

annuello

Gday all,

I'm evaluating a new NXA-PDU-1508-8 which seems like a well-featured PDU. The only issue I'm having with it is trying to read the Accumulated Energy levels. Has anyone got a sample code snippet to send me in the right direction? It seems to me that the accumulator levels are not accumulating - they are staying at 0.

Here is a telnet snippet, with comments next to the relevant levels. The setup is:
- PDU base AXlink address is 85
- Output #2 (AXlink device 86) has a 11.6W fan running for over 1 hour

>device status 86:1:1
Device Status
-------------
Device 86 AMX LLC,NXA-PDU-1508-8           ,v2.13.01 contains 1 Ports.
 Port     1 - Channels:255 Levels:8
              MaxStringLen=64 Types=8 bit  MaxCommandLen=64 Types=8 bit
              The following input channels are on:None
              The following output channels are on:1,255
              The following feedback channels are on:1,255
              Level 1=116 Supported data types=UByte,UInt    <---- 11.6W
              Level 2=1 Supported data types=UByte,UInt      <---- 0.1A
              Level 3=153 Supported data types=UByte,UInt
              Level 4=0 Supported data types=UByte,UInt      <---- Accumulator.  This aught to be !0
              Level 5=133 Supported data types=UByte,UInt    <---- AXlink 2 voltage 13.3v
              Level 6=0 Supported data types=UByte,UInt
              Level 7=0 Supported data types=UByte,UInt
              Level 8=0 Supported data types=UByte,UInt

Since the 11.6W load has been running for at least one hour I'd expect the accumulator (level 4) to show at least a level of 116. (11.6W x 1 hour, and the level has a resolution of 0.1W-hr.)

Any hints appreciated.

Roger McLean
Swinburne University

annuello

I've found the issue after running a bigger load for several hours. The accumulator is measuring 0.1kW-hr, not 0.1W-hr. There is a typo in the 240v manual which has been corrected in the non-240v manual. As my proof-reading luck would have it, I was using the 240v manual.

I suppose it makes good sense for the accumulator to be recording 0.1kW-hr rather than 0.1W-hr. Billing and rates are typically in kW-hr, and this would reduce the frequency of accumulator roll-over.

Roger McLean
Swinburne University

TurnipTruck

Glad to hear you like the PDU. I will be using several in the near future and was somewhat afraid of version 1.0!