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

Publié pour: Schneider Electric Belgium