Siemens F00090

What the Fault Means

Fault: Encoder feedback loss

Likely causes

• r0949 = 0: Encoder signal lost.
• r0949 = 1: Encoder loss detected due to sudden speed change (i.e. speed change detected on encoder in a
• r0949 = 2: Encoder signal lost whilst running at low speed.
• r0949 = 5: Encoder not configured in p0400, but required for sensored control (p1300 = 21 or 23).
• r0949 = 6: Encoder not found, but configured in p0400.
• r0949 = 7: Encoder loss detected due to motor stalled .

Solution and Safe First Checks

1. r0949 = 0: Encoder signal lost.
2. r0949 = 1: Encoder loss detected due to sudden speed change (i.e. speed change detected on encoder in a
3. r0949 = 2: Encoder signal lost whilst running at low speed.
4. r0949 = 5: Encoder not configured in p0400, but required for sensored control (p1300 = 21 or 23).
5. r0949 = 6: Encoder not found, but configured in p0400.
6. r0949 = 7: Encoder loss detected due to motor stalled .
7. r0949 = 2, Increase value of p0494 or reduce value of p1120 and p1121.
8. r0949 = 5, select encoder type via p0400.
9. r0949 = 5, select SLVC mode (p1300 = 20 or 22).
10. r0949 = 7, select SLVC mode (p1300 = 20 or 22).
11. Check connections between encoder and inverter.
12. Check that encoder not faulty (select p1300 = 0, run at fixed speed, check encoder feedback signal in r0061)
13. Increase encoder loss threshold in p0492.

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

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