Siemens SINUMERIK 840D sl Series Diagnostics Manual page 758

Overview of Alarms
Remedy: Reduce the ambient temperature for the DRIVE-CLiQ connection of the motor.
232410 <location>Encoder 2: Serial communications
Reaction: NONE
Acknowledge: NONE
Cause: Serial communication protocol transfer error between the encoder and evaluation module
SMCxx.
Alarm value (r2124, binary):
Bit 0: Alarm bit in the position protocol.
Bit 1: Incorrect quiescent level on the data line.
Bit 2: EnDat encoder does not response (does not supply a start bit).
Bit 3: CRC error: The checksum in the protocol from the encoder does not match the data.
Bit 4: Incorrect encoder acknowledgement: The encoder incorrectly understood the task
(request) or cannot execute it.
Bit 5: Internal error in the EnDat driver: An illegal mode command was requested.
Bit 6: Position value longer than 40 bits.
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
- replace the encoder.
232411 <location>Encoder 2: EnDat encoder signals alarms
Reaction: NONE
Acknowledge: NONE
Cause: The error word of the EnDat encoder has alarm bits that have been set.
Alarm value (r2124, binary):
Bit 0: Frequency exceeded (speed too high).
Bit 1: Temperature exceeded.
Bit 2: Control reserve, lighting system exceeded.
Bit 3: Battery discharged.
Bit 4: Reference point passed.
Remedy: Replace encoder.
232414 <location>Encoder 2: Amplitude error track C or D (C^2 + D^2)
Reaction: NONE
Acknowledge: NONE
Cause: The amplitude (C^2 + D^2) of track C or D is not within the tolerance bandwidth.
The nominal signal must be in the range 375 mV to 600 mV (500 mV -25 % / +20 %).
On the other hand, the response thresholds are < 230 mV and > 750 mV (frequency
characteristic).
This fault also occurs if the A/D converter is overcontrolled.
If the amplitude is not within the tolerance bandwidth, then it cannot be used to initialize the
start position.
Alarm value (r2124, decimal):
Low word: Signal level, track C (16 bits with sign).
High word: Signal level, track D (16 bits with sign).
A signal level of 500 mV corresponds to the numerical value 5333 hex = 21299 dec.
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
- replace the encoder or encoder cable.
- check the encoder module (e.g. contacts).
- check the Hall sensor box
232415 <location>Encoder 2: Amplitude alarm, track A or B (A^2 + B^2)
Reaction: NONE
Acknowledge: NONE
2-758
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005