Siemens Sinumerik 840D sl Diagnostic Manual page 933

03/2009
Cause: When the zero pulse is passed, a deviation in the incremental position was detected.
For equidistant zero marks, the following applies:
- The first zero mark passed supplies the reference point for all subsequent checks. The other zero
marks must have n times the distance referred to the first zero mark.
For distance-coded zero marks, the following applies:
- the first zero mark pair supplies the reference point for all subsequent checks. The other zero mark
pairs must have the expected distance to the first zero mark pair.
Alarm value (r2124, interpret decimal):
Deviation in quadrants (1 pulse = 4 quadrants).
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
- replace the encoder or encoder cable.
- remove any dirt from the coding disk or strong magnetic fields.
233432 <location>Encoder 3: Rotor position adaptation corrects deviation
Message %1
value:
Drive object: All objects
Reaction: NONE
Acknowledge: NONE
Cause: For track A/B, pulses have been lost or too many have been counted. These pulses are presently
being corrected.
Alarm value (r2124, interpret decimal): Last measured deviation of the zero mark distance in incre-
ments (4 increments = 1 encoder pulse). The sign designates the direction of motion when detecting
the zero mark distance.
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
- replace the encoder or encoder cable.
- check encoder limit frequency.
- adapt the parameter for the distance between zero marks (p0424, p0425).
233443 <location>Encoder 3: Signal level C/D unipolar outside tolerance
Message Fault cause: %1 bin
value:
Drive object: All objects
Reaction: NONE
Acknowledge: NONE
Cause: The unipolar level (CP/CN or DP/DN) for encoder 3 is outside the permissible tolerance.
Alarm value (r2124, interpret binary):
Bit 0 = 1: Either CP or CN outside the tolerance.
Bit 16 = 1: Either DP or DN outside the tolerance.
The unipolar nominal signal level of the encoder must lie in the range 2500 mV +/- 500 mV.
The response thresholds are < 1700 mV and > 3300 mV.
Note:
The signal level is not evaluated unless the following conditions are satisfied:
- Sensor Module properties available (r0459.31 = 1).
- Monitoring active (p0437.31 = 1).
Remedy: - check that the encoder cables and shielding are routed in compliance with EMC.
- check the plug connections and contacts.
- are the C/D tracks connected correctly (have the signal lines CP and CN or DP and DN been inter-
changed)?
- replace the encoder cable.
233500 <location>Encoder 3: Position tracking traversing range exceeded
Message -
value:
Drive object: SERVO, VECTOR
Reaction: OFF1 (NONE, OFF2, OFF3)
Acknowledge: IMMEDIATELY
© Siemens AG 2009 All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-933