Siemens SINUMERIK 840D sl Series Diagnostics Manual page 760

Overview of Alarms
Remedy: - check mechanical mounting tolerances for encoders without their own bearings (e.g.
toothed-wheel encoders).
- check the plug connections (also the transition resistance).
- check the encoder signals.
- replace the encoder or encoder cable.
232429 <location>Encoder 2: Position difference, track C/D and A/B too large
Reaction: NONE
Acknowledge: NONE
Cause: The error of track C/D is greater than +/-15 ° mechanical or +/-60 ° electrical.
One period of track C/D corresponds to 360 ° mechanical.
One period of the Hall signal corresponds to 360 ° electrical.
The monitoring responds if, for example, Hall sensors are connected as equivalent for the
C/D tracks with the incorrect rotational sense or supply values that are not accurate
enough.
Alarm value (r2124, decimal):
Measured deviation as mechanical angle (16 bits with sign, 182 dec corresponds to 1 °).
Remedy: - track C or D not connected.
- correct the direction of rotation of the Hall sensor possibly connected as equivalent for
track C/D.
- check that the encoder cables are routed in compliance with EMC.
- check the adjustment of the Hall sensor.
232801 <location>Encoder 2 DRIVE-CLiQ: Sign-of-life missing
Reaction: A_INFEED: OFF2 (NONE)
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: IMMEDIATELY
Cause: DRIVE-CLiQ communications error between the control unit and the encoder involved.
Fault value (r0949, hexadecimal):
0A: The sign-of-life bit in the receive telegram is not set.
Remedy: - check the electrical cabinet design and cable routing for EMC compliance
- replace the component involved.
See also: p9916
232802 <location>Encoder 2: Time slice overflow
Reaction: A_INFEED: OFF2 (NONE)
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: IMMEDIATELY
Cause: Time slice overflow, encoder 2.
Fault value (r0949, decimal):
9: Time slice overflow of the fast (current controller clock cycle) time slice.
10: Time slice overflow of the average time slice.
12: Time slice overflow of the slow time slice.
999: Timeout when waiting for SYNO, e.g. unexpected return to non-cyclic operation.
Remedy: Reduce the current controller frequency.
232804 <location>Encoder 2: CRC CODE RAM
Reaction: A_INFEED: OFF2 (NONE)
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: IMMEDIATELY
Cause: The checksum via the CODE-RAM of the sensor module has changed in operation.
Fault value (r0949, hexadecimal):
Difference between the checksum at POWER ON and the actual checksum.
Remedy: Hardware defect: Replace the sensor module.
Firmware error: If required, upgrade the firmware.
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SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005