F32123 — Encoder 2: Signal level A/B outside tolerance

F32123 is raised when the drive evaluates the unipolar track signal levels of Encoder 2 and finds one of them outside the permissible tolerance. The unipolar nominal signal level of the encoder must lie in the range 2500 mV +/- 500 mV; the drive intervenes when a level falls below 1700 mV or rises above 3300 mV. The affected pair is either AP/AN or BP/BN — the fault value in r0949 tells you which.

The S120/S150 manual titles the message "Encoder 2: Signal level A/B outside tolerance", the G130/G150 manual "Encoder 2: Signal level A/B unipolar outside tolerance"; both describe the same condition for Encoder 2. Depending on the drive configuration, the same condition can also be output as an alarm (A) or without any automatic reaction (N). As a fault, the drive reacts with OFF1 and the message must be acknowledged immediately.

• The unipolar level (AP/AN or BP/BN) for Encoder 2 lies outside the permissible tolerance — below 1700 mV or above 3300 mV, where 2500 mV +/- 500 mV is the nominal level.

1. Make sure that the encoder cables and the shielding are installed in an EMC-compliant manner.
2. Check the plug connections and contacts of the encoder cable.
3. Check whether a signal cable is short-circuited with ground (mass) or with the operating voltage.
4. Replace the encoder cable.

The drive writes the fault cause into r0949; interpret the value in binary. The manual decodes:

• Bit 0 = 1: either AP or AN is outside the tolerance.
• Bit 16 = 1: either BP or BN is outside the tolerance.

• r0949 — fault value: read the cause of F32123 here and interpret it bit by bit (bit 0 = AP/AN pair, bit 16 = BP/BN pair).
• r0459 — Sensor Module properties extended: bit 31 must read 1 ("Sensor Module properties available"); the signal level is only evaluated when this is the case.
• p0437 — Sensor Module configuration extended: bit 31 shows whether monitoring is active; if it is not, the drive does not check the signal level at all.

Rectify the encoder cabling as listed above, then acknowledge the fault immediately — the drive only accepts a restart once the message has been acknowledged. When the drive is configured to output the condition as alarm (A) or without reaction (N), neither an automatic reaction nor an acknowledgement takes place.