Status page showing 1100hz, 0 volts on all CT's and VT - diagnosed

Support
1

Hi all, I have just installed an Iotawatt and it doesn’t seem to be working properly, I’m assuming I’m doing something wrong. My building has 208v 3 phase power, but the panel I’m monitoring is only single phase, fed by 2 hots, a neutral, and a ground. I have a TDC DA-10-09-E6 connected for my 9v AC reference ground, and a 5v USB DC adapter. For my CT’s, I’m using 2x AcuCT-H063-100, 1 connected to each hot leg. Here are pictures of my panel:

20230211_211957
20230211_2119571920×2560 593 KB

20230211_212004
20230211_2120041920×2560 452 KB

Here’s a screenshot of my status page, which obviously shows I have done something wrong!

Screenshot 2023-02-11 215805
Screenshot 2023-02-11 215805777×687 32.5 KB

2

The immediate issue is that the voltage reference isn’t working. You might check if the transformer is putting out any voltage.

Once you get a voltage reference, you will need to treat your service as three-phase using derived reference. You only have two of the three phases, but that’s ok. You cannot treat it as single or split phase.

3

Thanks, I just checked and I’m not getting ANY voltage out of that adapter. What’s the warranty on that? I literally just pulled it out of the box yesterday, but I purchased everything a year ago January.

4

I stand behind things for a year. I’ve never had one of those DOA. If you send it back to me, I’ll send you a replacement part, but I don’t have any of those TDC anymore.

Have you tested it in a different receptacle?

5

Hello, I have tested on multiple outlets. How do I go about returning this?

Chad

6

Hello, i received the replacement transformer and am now seeing 60hz, great! Next, I went through the documentation about setting up derived reference. It states to connect CT’s to each of the 3 phases, but in this panel I only have 2 legs. Any hints on how to proceed on that?

7

Just use two. The one with the VT is phase A, the other will be either phase B or C.

8

Thanks, it looks like I may have things configured properly now?

Capture
Capture614×515 54.3 KB

9

Not really. Which of the breakers in the picture feeds the receptacle where the AC transformer is connected?

10

The VT is connected to Input 1

11

Read the question again.

12

This breaker here:
breakers

I just changed the config around so the VT is setup on the same phase as input 1 and unchecked “allow negative value”:

inputs
inputs606×723 38.7 KB

Here’s the status page now:

status
status650×581 56.8 KB

13

So input 1 is the CT on the black wire?

Click reverse in the input0 setup.

Then post the status display.

14

Correct, Input 1 is connected to the CT on the black wire. Here’s a screenshot:

input0 reverse
input0 reverse606×528 54.3 KB

15

Change input_2 to phase C

16

Done, here are some screenshots:

Input2PhaseC
Input2PhaseC614×732 38.8 KB

new_status
new_status610×528 55.9 KB

1 Like
17

Now that I have a few days of tracking, does this graph look correct? It seems like they shouldn’t look so different from each other?

graphing
graphing1587×802 110 KB

18

You don’t have any 240V loads, so the two are completely independent. Without CTs on the loads and/or some knowledge of what they are powering, I have no idea. They are certainly plausible.

Input_1 seems to have a constant load of about 140Watts and a transient load of about 180Watts.
Input_2 appears to have a constant load of about 90Watts, and transient loads of about 130 Watts and 50 Watts.

Does that sound like your regular loads?