Fluke 435-II

The <...Manual...Does...> not <...need to be changed to match the load current...>, so why not actually read it?

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From The manual

"The Range of waveforms is preadjusted for a good display in almost all cases. This is based upon Nominal Voltage (Vnom) and Current range (A Range). If desired, you can change the Range."

So for 60-70A load current expected, the current range should be set to 100A?

The current could spike well above what's expected...so a comfortable safety margin should be incorporated...I would set to maximum circuit capacity++, or above trip current..

If you are measuring amps above 3000 then you need to set the range higher...

I believe the range should be set to the range of the current probes In use. Different types of current probes used with these power quality instruments have different ranges.

The default range (or the highest) is where you start. If reading is less than 1/3 scale, you downrange to get a higher indication for better accuracy.

Thanks. I have another issue.

The network is 3 phase 4 wire, but the panel of interest is 3 phase 3 wire.

Shall I connect the neutral ct and voltage probe to the ground wire.

Thanks

Thanks. I did it in delta with phase to phase voltage 600v as it was suggested by fluke technical supports

Appreciated your response and hopefully did the correct thing

One more clarification I have about the connection.

I connected the phases correctly as labeled on the panel (L1, L2, L3 left to right) and I got rotation CBA. I switched L1 and L3 Voltage and CT sensors and got the correct Indication ABC.

I considered the labels and the colour codes on the feeder cable wrong. or could it be a setting parameter that reads CBA although the rotation should be ABC. I saw some setting video for older version which has indication of sequence or rotation, which indicate opposite direction or rotation

Obviously asking to change is a lot of work, as all the motors (28 nos.)are connected and running.

Let me know your input on the equipment if there is a setting issue.

I don't change something that works. It would be a good idea to document what you find, for instance which color wire is connected to L1 and so forth.

Phase rotation is arbitrary anyways. CBA or ABC doesn't really matter if your motor rotates in the desired direction. But Fluke gives you an ambiguous symbol anyways.

Flip your A and C connections and the arrow should show the other direction. For whatever that's worth.