Siemens SINUMERIK 840D sl Series Diagnostics Manual page 756

Overview of Alarms
232118 <location>Encoder 2: Speed difference outside the tolerance range
Reaction: A_INFEED: NONE
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: READY
Cause: The speed difference between two sampling cycles has exceeded the value in p0492.
The error is only evaluated for HTL/TTL encoders.
Fault value (r0949, decimal):
Speed difference per current controller clock cycle in increments.
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).
232120 <location>Encoder 2: Power supply volt.
Reaction: A_INFEED: NONE
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: READY
Cause: Encoder power supply voltage fault.
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.
Fault value (r0949, binary):
Bit 0: Undervoltage condition on the sense line (threshold 4.75 V).
Bit 1: Encoder power supply voltage overcurrent condition (threshold 450 mA).
Remedy: For fault value, bit 0 = 1:
- correct encoder cable connected?
- check the plug connections of the encoder cable.
- SMC30: Check the parameterization (p0404.22).
For fault value, bit 1 = 1:
- correct encoder cable connected?
- replace the encoder or encoder cable.
232129 <location>Encoder 1: Position difference, track C/D and A/B too large
Reaction: A_INFEED: NONE
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: READY
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.
After fine synchronization using a reference mark, the fault is no longer triggered.
Fault value (r0949, 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.
232130 <location>Encoder 2: Zero mark and position of track C/D do not match
Reaction: A_INFEED: NONE
SERVO: ENCODER (DCBRAKE, NONE, OFF1, OFF2, OFF3, STOP1, STOP2)
Acknowledge: READY
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SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005