EM49xx Setup & Configuration

[johannvd]

Good day,

An existing installation of an EM4900 multi-circuit meter required monitoring of additional circuits.

Existing install had Channel 1 - 20 all as single phase and 21-23 & 24-26 as three phase connections.

CT's was installed and connected to channels 27, 28 and 29 and meter was setup using ION Setup on the following screens:

1. Branch Circuit Sizes
2. Breaker Sizes
3. Logical Mater Setup

The meter itself was also restarted as the default Operating_Mode  is 1 (Discovery) and is required to detect configuration changes but I believe this is related to BACnet which is not being used as the meter is connected to a PME.

The issue we are facing is that the meter does not display the correct Amp readings for any of the three new CTs installed. One of the CT outputs were measured using a multimeter and we did pick up a reading.

I've gone through the following document but could not find any information as to what might be the cause or the solution. 

Any help will be appreciated.

Thanks,

Johann

[johannvd · Accepted solution]

Just to close the loop on this.

Upon closer review of the configuration and actually intending to move some of the CT's around to ensure that all single phase connections are grouped prior to any three phase connection I realized the CT configuration was incorrect.

For the 2 x three phase connections the CT configuration is to be done on all the channels. This is a bit in contrast to a "normal" three phase meter where the CT ratio is only configured once and this is where the previous configuration was incorrect. I basically took the existing configuration as correct and just added the three new CT's at the end of the list.

Once the meter was reconfigured on all CT channels regardless of single- of three-phase the readings came through correctly (verified) for the new circuits and was also corrected on the two three-phase connections as well although the readings were extremely low on these connections.