Application Notes: Measuring demand (kW) and consumption (kWH):

Measuring demand (kW) and consumption (kWH):

For monitoring both instantaneous power (kW) for demand control and consumption over time (kWH), the VERIS 6000 series provides high accuracy (better than 1%) with low-cost installation to provide an excellent solution for the building owner with the need to submeter one or more tenants or the physical plant. The 6001 meter provides a NEMA1 rated enclosure with conduit knockouts for easy installation in almost any field environment covering any voltage from 120V to 600V AC. The split core CT's mean that there is no need to remove any of the primary conductors to monitor current flow and a selectable pulse rate allows easy field setup for any automation panel. The 6000 series also provides a contact output for phase loss or undervoltage (adjustable by the owner) if either condition is detected by the panel.

Installation instructions:

Set input voltage switch to proper voltage
Make voltage connections using 14-26 AWG wire, fused according to NEC requirements, being sure to observe phasing (A,B, and C)
Install Veris "safe" CT's on primary conductors... critical concerns for CT installation are:
- Insure that arrows on CT's point in the direction of the load (e.g., motor or building load) and not at the source
- Insure that the CT's are matched properly to the voltage inputs (i.e., phase A voltage matched with phase A current)
Connect outputs from power meter to automation system
Turn on the load being monitored
Select the maximum pulse rate using the chart provided with the unit
Determine the maximum kW value for the 3 phase analog output using the formula:

kW maximun = (Exl _cr x 1.73)/1000

Calculate the kW value for programming the automation panel:

kW maximun = [(Exl _cr x 1.73) x (mA_out - 4)]/1000 x 16

For additional information on power and sample formulas, see Appendix A

Troubleshooting tips:

If the output of the pulse or analog does not appear to match the expected values, check that the phase loss/reversal light is lit. If the light is unlit, the installation is probably incorrect. Check the following:
- Make sure that the CT's are properly oriented so that the arrows on the label are pointing towards the load and away from the source
- Make sure that the CT's are properly matched with the voltages (i.e., Volts A to Current A; Volts B to Current B; Volts C to Current C)
- Make sure that the voltage selection switch is set in the proper position for the actual input voltage
If the installation appears to be correct, use the following procedure to verify that all devices are wired correctly and working properly:

Disconnect all CT's except the phase A CT;
Install jumper wires in the Phase B and C current inputs
Set the pulse output switch to "Test" mode
Verify that there is current flowing in phase A
The "kWH" output should be flashing at a rate of approximately 1 pulse per second (actual rate may vary depending on the load)
If there is not pulse at the output, reverse the white and black CT wires on phase A. If the pulse starts, the CT is reversed. If there is still no pulse, contact the factory
Repeat the test for phases B and C, making sure to jumper the unused CT inputs during each test
If this does not correct the problem, contact the factory for technical support

6000 series wiring diagram:

Applications are suggestions. Field applications vary; since manufacturer does not install the devices, it is up to the installer to ensure suitability and compliance to appropriate codes.