Frequently Asked Questions

Our system is a 277/480V Wye system. Can I use it to power my meter? I have a D2 option control power.

The Power supply option D2 has a range of 90-265 V AC or 100-370 V DC so 277 V AC is about 5% higher than the rated voltage. When used at this higher voltage and in prolonged period of time will have great effect on the power supply that may cause the meter to break down early. It is recommended to seek an alternative 120 V AC regular plug or use a control power transformer to step down the voltage from 480 V to 120 V.

I am only using the meter for current measurement only and I have my CTs in place but the meter is not reading even if I have my load.

At least one voltage input with a minimum 20 V AC must be connected in it to work. This is “bias” voltage and is necessary for the meter to work properly in CT measurement mode only.

Can I use the meter for single phase application? How do I wire it for single phase?

Yes the meter can be used for any single phase application (2 wire or 3 wire). The manual already have an example of the wiring diagram for Dual phase (3 wire) and single phase (2 wire). Please see pages 4-9 to 4-10 for the diagram.

On other power meter electrical diagram, the CTs are tied up at the Lo side and connected to ground. But the Shark manual doesn’t show any Lo side being tied up together to ground. Should we tie it up to ground?

Indeed, our electrical diagrams doesn’t show it because our current input terminals are already tied up to ground internally. So there’s no need to do it externally.

Can I use the infrared port of my laptop to connect to the meter via IrDA port?

No. You will need our CAB6490 IrDA dongle to do that. The dongle comes already with Windows 7 compatible driver and so driver installation is automatic. The important feature that makes it ‘Standard Modem Over Ir Link” is the most important feature for it to connect seamlessly to the meter using our Communicator EXT software.

Where do I read the peak demand in the front display?

Press the scroll down button to go to “W/VAR/PF” screen and then press the arrow right button once to lit the “MAX” LED on the left side. The phase A reading is your Max Demand Watts reading or Peak demand at 15 minute interval (default) settings.

Accordion Panel

The assumption for the Kh is correct. TV stands for “Test Voltage” or also the voltage input. the Kh unit is Wh/pulse and is expressed in secondary so you need to use the CT ratio and PT ratio to express it in primary. So for example, if the CT is 400/5 and has no PT (120/120) then the CT ratio is 80 and PT ratio is 1. So, the overall factor to be used to multiplied to the number of pulses counted by the PLC is

Factor = Kh x CT ratio x PT ratio = 0.500017776x80x1 = 40.00


Energy consumption (kWh)= [Factor x No. of Pulses received] / 1000

We are using the 20mA output card that is tied up to our control monitoring system but the outputs on all channels are always 24mA no matter what input load we have. This is a brand new meter and we just installed it. What seems to be the problem? We are using the default configuration but it didn’t work?

The default configuration works only with initial meter device profile. This means the PT numerator and denominator and CT num are not changed. Once the CT and PT ratios are changed then you will need to program each channels with high and low output based on primary values of the CT and PT. Programming will need our Communicator EXT 3.0 software and the means to communicate to the meter.

I’m polling the Shark reading via Modbus. I’m using the registers in the Primary Reading Block starting from 1000 to 1029 and had my software set to integer.

From the Shark 200 Modbus Register Map, the Primary Readings Block Format is Float (or reverse float for most software settings) but for some software that doesnt have the Float format, Integer reads can be used by using the formula,

Modbus = (1st Shark Modbus register x 65536) + (2nd Shark Modbus register + 65536)/65536

Remember that the resulting modbus is expressed in secondary values so to convert into Primary readings use CT ratio for current, PT ratio for voltage and CT and PT ratio for Power.