Schneider ATV61F frequency converter
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The company uses an inverter of the Schneider ATV61F model. I need to monitor the motor’s operating current on the DCS. The motor’s rated power is 132 KW, with a rated current of 269 A. The rated power and current values set on the inverter are based on those indicated on the motor’s nameplate. Now, the manufacturer requires that the current range on my DCS be set to (0–538) A, which seems unreasonable to me; why do I need to double these values? I suspect that there may be an issue with the inverter’s parameter settings. Together with the equipment supplier, we checked the AO2 parameter settings, and it turned out that 4-20 mA corresponds to 0%-100%. I hope someone can help determine whether this is a problem with the parameter settings or if it’s simply a requirement of the inverter itself, one that cannot be changed (according to the supplier’s response).
Check the inverter’s manual; I’ve encountered similar situations as well, and it seems to be due to the internal parameters of the inverter
I’ve been reading the instructions for a few days, but I still don’t understand them
In reality, does the current displayed by the inverter correspond to that shown by the DCS?
The manufacturer’s requirement is reasonable; if it corresponds to the rated current, what happens in case of an overload? The DCS still displays the rated value. The factor of 2 is there so that you can see the overload current value
If the DCS range isn’t doubled, it won’t match
I have also used inverters from other manufacturers, and they don’t have such a requirement; they all have corresponding rated currents. Moreover, it’s possible to set alarm values on my DCS
Since 4-20mA corresponds to the motor’s rated value, the maximum value that can be received by the DCS is also the motor’s rated value. How should the alarm threshold be set?
I set an alarm value lower than the rated value on my DCS, and the operating current of the motor is generally also below the rated value
It’s not underload; on the DCS, the alarm thresholds for current levels can be set