Siemens F07551

What the Fault Means

Fault: Drive encoder: No commutation angle information

Likely causes

• The commutation angle information is missing
• This means that synchronous motors cannot be controlled (closedloop control) Fault value (r0949, interpret decimal): yyyyxxxx dec: yyyy = fault cause, xxxx = drive data set yyyy = 1 dec: The motor encoder used does not supply an absolute commutation angle
• yyyy = 2 dec: The selected ratio of the measuring gear does not match the motor pole pair number.

Solution and Safe First Checks

1. check the encoder parameterization (p0404).
2. use an encoder with track C/D, EnDat interface of Hall sensors.
3. use an encoder with sinusoidal A/B track for which the motor pole pair number (r0313) is an integer multiple of the
4. activate the pole position identification routine (p1982 = 1) for motor encoders without absolute position information.
5. the quotient of the pole pair number divided by the ratio of the measuring gear must be an integer number: (p0314 *

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

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