Siemens Sinumerik 840D sl Diagnostic Manual page 876

Overview of Alarms
SINAMICS-Alarms
231421 <location>Encoder 1: Coarse position error
Message %1
value:
Drive object: All objects
Reaction: NONE
Acknowledge: NONE
Cause: For the actual value sensing, an error was detected. As a result of this error, it must be assumed that
the actual value sensing supplies an incorrect coarse position.
Alarm value (r2124, interpret decimal):
3: The absolute position of the serial protocol and track A/B differ by half an encoder pulse. The abso-
lute position must have its zero position in the quadrants in which both tracks are negative. In the case
of a fault, the position can be incorrect by one encoder pulse.
Remedy: Re alarm value = 3:
- for a standard encoder with cable, if required, contact the manufacturer.
- correct the assignment of the tracks to the position value that is serially transferred. To do this, the
two tracks must be connected, inverted, at the Sensor Module (interchange A with A* and B with B*)
or, for a programmable encoder, check the zero offset of the position.
231429 <location>Encoder 1: Position difference, hall sensor/track C/D and A/B
too large
Message %1
value:
Drive object: All objects
Reaction: NONE
Acknowledge: NONE
Cause: The error for track C/D is greater than +/-15 ° mechanical or +/-60 ° electrical or the error for the Hall
signals is greater than +/-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, interpret decimal):
For track C/D, the following applies:
Measured deviation as mechanical angle (16 bits with sign, 182 dec corresponds to 1 °).
For Hall signals, the following applies:
Measured deviation as electrical angle (16 bits with sign, 182 dec corresponds to 1 °).
See also: p0491 (Motor encoder fault response ENCODER)
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.
231431 <location>Encoder 1: Deviation, position incremental/absolute too large
Message %1
value:
Drive object: All objects
Reaction: NONE
Acknowledge: NONE
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).
See also: p0491 (Motor encoder fault response ENCODER)
2-876
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG 2009 All Rights Reserved
03/2009