F31122 — Encoder 1: Internal power supply voltage faulty

F31122 reports a hardware fault in the encoder electronics for Encoder 1. The S120/S150 manual titles the code “Encoder 1: Sensor Module hardware fault”, the G130/G150 manual “Encoder 1: Internal power supply voltage faulty” — both describe the same trip at the component Sensor Module Encoder 1: an internal supply problem in the encoder electronics, described on the G130/G150 as a fault in the internal reference voltage of the ASICs for encoder 1. The drive writes a fault value into the message value (%1) and into r0949; read as a decimal number, it identifies which of the three internal voltages failed.

• Sensor Module Encoder 1 reports an internal hardware fault; this is the component both manuals name for the code.
• The wording differs slightly by family: the S120/S150 manual states that an internal Sensor Module hardware fault was detected, while the G130/G150 manual calls it a fault in the internal reference voltage of the ASICs for encoder 1.

1. Read the fault value in r0949, interpreting it as a decimal number, to see which internal voltage triggered the trip.
2. Replace the motor with DRIVE-CLiQ or the appropriate Sensor Module. Both manuals give this as the only remedy — no other check, setting or wiring measure is described for this code.

• The message value %1 and r0949 carry the fault value; interpret it as a decimal number.
• 1: Reference voltage error.
• 2: Internal undervoltage.
• 3: Internal overvoltage.

• r0949 — holds the fault value for this code; read it as a decimal number to distinguish a reference voltage error (1) from an internal undervoltage (2) or internal overvoltage (3).

The fault is acknowledged immediately. Because the cause is a hardware fault inside Sensor Module Encoder 1, an acknowledgement only clears the code if the internal voltage fault has actually gone; while the encoder electronics are defective the code comes back, and the remedy remains replacing the motor with DRIVE-CLiQ or the appropriate Sensor Module.