Siemens Sinumerik 840D sl Diagnostic Manual page 765

03/2009
Remedy: - leave the STOP cam plus in the negative traversing direction and return the axis to the valid travers-
ing range.
- check the wiring of the STOP cam.
207493 <location>LR: Overflow of the value range for position actual value
Message %1
value:
Drive object: SERVO, VECTOR
Reaction: OFF1 (OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: The value range (-2147483648 ... 2147483647) for the position actual value representation was
exceeded.
When the overflow occurs, the "referenced" or "adjustment absolute measuring system" status is
reset.
Fault value (r0949, interpret decimal):
1: The position actual value (r2521) has exceeded the value range.
2: The encoder position actual value Gn_XIST2 (r0483) or the absolute value after the load gear
(r2723) has exceeded the value range.
3: The maximum encoder value times the factor to convert the absolute position (r0483 and/or r2723)
from increments to length units (LU) has exceeded the value range for displaying the position actual
value.
Remedy: If required, reduce the traversing range or position resolution (p2506).
Increase the fine resolution of absolute position actual value (p0419).
Reference to fault value = 3:
If the value for the maximum possible absolute position (LU) is greater than 4294967296, an adjust-
ment cannot be made due to an overflow.
For rotary encoders, the maximum possible absolute position (LU) is calculated as follows:
1. Motor encoder without position tracking:
p2506 * p0433 * p2505 / (p0432 * p2504)
p2506 * p0433 * p2505 * p0421 / (p0432 * p2504) for multiturn encoders
2. Motor encoder with position tracking for measuring gear
p2506 * p0412 * p2505 / p2504
3. Motor encoder with position tracking for load gear:
p2506 * p2721 * p0433 / p0432
4. Motor encoder with position tracking for load and measuring gear:
p2506 * p2721
5. Direct encoder without position tracking:
p2506 * p0433 / p0432
p2506 * p0433 * p0421 / p0432 for multiturn encoders
6. Direct encoder with position tracking for measuring gear:
p2506 * p0412
207494 <location>LR: Drive Data Set changeover in operation
Message -
value:
Drive object: SERVO, VECTOR
Reaction: OFF1 (OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: A drive data set changeover (DDS changeover) when the mechanical relationships change (p2503 ..
2506), the direction of rotation (p1821) or the encoder assignment (p2502) were requested during
operation.
Remedy: To changeover the drive data set, initially, exit the "operation" mode.
207495 <location>LR: Reference function interrupted
Message -
value:
Drive object: SERVO, VECTOR
Reaction: NONE
Acknowledge: NONE
© Siemens AG 2009 All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-765