PM800 and PM5350 meters - Netural connections causing problems with readings

[sesa207714_brid]

Hi,

We currently have a customer who is complaining about some issues relating to the PM800, PM5350 meters, and neutral connections. Below is some detail on it. Unfortunately we do not have drawings for this, as the customer has been making changes on site, on the fly and hasn't documented any of this.

• Board has a combination of PM850 and PM5350 meters for different outgoing feeders on the board.
• PM850 have a UPS supply to allow them to maintain communications when a power outage occurs, and the transfer from mains to gen hasn't occurred yet.
• Customer installed PM850 meters without a neutral connection. Neutral connection was installed for PM5350 meters.
• Line to Neutral readings were off so one of our engineers recommended adding neutral wiring to the PM850 meters. PM5350 meters were reading correctly according to the customer
• Once the neutral was added to the PM850 meters the readings for the PM5350 have gone bad according to the customer. (No more info on how they have gone bad. Unfortunately the customer did not mention this until after we had flown out from the site).

My strong feeling is that the customer has wired something incorrectly, but they are quite a hostile customer and I would like to know if this has been encountered before? Previously they have been quite aggressive when we asked them to investigate their own work unless we could definitively prove our hardware was infallible.

Thanks for all of your assistance with this issue, and apologies for the lack of information available.

Regards,

Martin

[Yut · Accepted solution]

Seem to be a delta system,isn't it ? If delta set meter to delta.

[sesa207714_brid]

Hi Yut,

Thanks for that. Passed it along to the board builder onsite.

Regards,

Martin