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What is the unit of LCR register in Altivar Process ATV600/ATV900 variable speed drive?

Register LCR in Altivar Process ATV600/ATV900 is in fixed point format. According to drive rating there are 2 or 1 or 0 decimal digits.

So, the unit is:
up to 15 kW : 0.01A;
18kW to 160kW : 0.1A;
220kW and more : 1A;


The reason for this is limited range of the register and accuracy of AD converters.

The LCR register in Altivar Process ATV600/ATV900 drives provides motor current feedback used for monitoring and diagnostics.

Its value is not stored as a floating‑point number but as a fixed‑point format, where the number of decimal places depends on the drive’s power rating.

The unit and decimal resolution of the LCR register is drive‑rating‑dependent:

Drive rating (ATV600 / ATV900)

Decimal resolution

Register unit

Up to 15 kW

2 decimal digits

0.01 A

18 kW to 160 kW

1 decimal digit

0.1 A

220 kW and above

0 decimal digits

1 A

Interpretation example:

  • If LCR = 2534 on a 15 kW drive → 25.34 A
  • If LCR = 253 on a 55 kW drive → 25.3 A
  • If LCR = 25 on a 250 kW drive → 25 A

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