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