Siemens SINAMICS S210 - F31118 (N, A) Encoder 1: Speed Change Not Plausible; F31120 (N, A) Encoder 1: Encoder Power Supply Fault

F31118 (N, A) Encoder 1: Speed change not plausible
Message value: %1
Drive object: All objects
Reaction: Servo: ENCODER (IASC/DCBRK, NONE)
Acknowledge: PULSE INHIBIT
Cause: For an HTL/TTL encoder, the speed change has exceeded the value in p0492 over several sampling cycles.
The change to the averaged speed actual value - if applicable - is monitored in the current controller sampling time.
Encoder 1 is used as motor encoder and can be effective has fault response to change over to encoderless operation.
Fault value (r0949, interpret decimal):
Only for internal Siemens troubleshooting.
Remedy: - check the tachometer feeder cable for interruptions.
- check the grounding of the tachometer shielding.
- if required, increase the maximum speed difference per sampling cycle (p0492).
Reaction upon N: NONE
Acknowl. upon N: NONE
Reaction upon A: NONE
Acknowl. upon A: NONE
F31120 (N, A) Encoder 1: Encoder power supply fault
Message value: Fault cause: %1 bin
Drive object: All objects
Reaction: Servo: ENCODER (IASC/DCBRK, NONE)
Acknowledge: PULSE INHIBIT
Cause: An encoder power supply fault was detected.
Fault value (r0949, interpret binary):
Bit 0: Undervoltage condition on the sense line.
Bit 1: Overcurrent condition for the encoder power supply.
Bit 2: Overcurrent condition for encoder power supply on cable resolver excitation negative.
Bit 3: Overcurrent condition for encoder power supply on cable resolver excitation positive.
Bit 4: The 24 V power supply through the Power Module (PM) is overloaded.
Bit 5: Overcurrent at the EnDat connection of the converter.
Bit 6: Overvoltage at the EnDat connection of the converter.
Bit 7: Hardware fault at the EnDat connection of the converter.
Note:
If the encoder cables 6FX2002-2EQ00-.... and 6FX2002-2CH00-.... are interchanged, this can result in the encoder being
destroyed because the pins of the operating voltage are reversed.
Faults and alarms
13.2 List of faults and alarms
SINAMICS S210 servo drive system
558 Operating Instructions, 12/2017, A5E41702836B AA