Sinumerik Alarm 26020 Axis %1 encoder %2 hardware fault %3 during encoder initialization

Sinumerik Alarm 26020 Axis %1 encoder %2 hardware fault %3 during encoder initialization

Parameters:
%1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding

Definitions:
Error during initialization of encoder (refer to additional information for absolute encoder interface from error fine coding). The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready).

Reactions:
– The NC switches to follow-up mode.
– Mode group not ready.
– Channel not ready.
– NC Start disable in this channel.
– Axes of this channel must be re-referenced.
– Interface signals are set.
– Alarm display.
– NC Stop on alarm.
– Channel not ready.
– If the axis is a single axis when this alarm is triggered, the alarm is only effective for this axis (not effective for e.g. the channel or mode group)

Remedy:
Please inform the authorized personnel/service department. Rectify hardware error, replace encoder if necessary. Make sure that an appropriate control module supporting this function is available with EnDat or SSI absolute encoders. Bit nos. and their significance:
Bit 0: Lighting failed
Bit 1: Signal amplitude too small
Bit 2: Position value incorrect
Bit 3: Overvoltage
Bit 4: Undervoltage
Bit 5: Overcurrent
Bit 6: Battery change necessary
Bit 7: Control check error, Note: SW 4.2 and higher, synchronous linear motor
Bit 8: EnDat encoder, incorrect overlapping, Note: SW 4.2 and higher, synchronous linear motor
Bit 9: C/D track error on encoder ERN1387 or EQN encoder connected or incorrectly con- figured (not on EQN, MD 1011)
Bit 10: Log cannot be aborted or old hardware
Bit 11: SSI level detected on data line or no encoder connected or incorrect encoder cable (ERN instead of EQN)
Bit 12: Timeout while reading measuring value
Bit 13: CRC error
Bit 14: Wrong IPU submodule for direct measuring signal, Note: Only with 611D expansion
Bit 15: Encoder faulty

Program Continuation:
Switch control OFF – ON.