Siemens SINUMERIK 840D Diagnostics Manual page 359

10.04
Program Continuation:
25021
Parameters:
Definitions:
Reactions:
Remedy:
Program Continuation:
25022
Parameters:
Definitions:
Reactions:
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA), 10.04 Edition
1. Transmission path: Check the actual-value connector on the motor and on the FDD
module for correct contacting, encoder cable for continuity, and also check for short-cir-
cuits or grounding (loose contact?).
2. Encoder pulses: Encoder power supply within the tolerance limits?
3. Evaluation electronics: Replace or reconfigure the drive module used.
Monitoring can be switched off by setting machine data 36310
ENC_ZERO_MONITORING [n]=... N ... encoder number: 1, 2) is set to 0.
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Axis %1 zero mark monitoring of passive encoder
%1 = Axis name, spindle number
Monitoring relates to the encoder that is not used by the position control! (Interface signal
DB 31 - 48, DBX 1.5 = 0 or 1.6 = 0)
The position encoder pulses between 2 zero marker pulses are counted (hardware func-
tion). A check is made in the interpolation cycle grid (standard setting 4 ms) as to whether
the encoder always issues the same number of pulses between the zero markers. As
soon as a difference is registered in the 4 counter bits of lowest significance, an alarm is
triggered!
- Alarm display.
Please inform the authorized personnel/service department. The differences can result
from transmission errors, disturbances, encoder hardware faults or from the evaluation
electronics in the encoder used for position control. The actual value branch must there-
fore be checked:
1. Transmission path: Check the actual-value connector on the motor and on the FDD
module for correct contacting, encoder cable for continuity, and also check for short-cir-
cuits or grounding (loose contact?).
2. Encoder pulses: Encoder power supply within the tolerance limits?
3. Evaluation electronics: Replace or reconfigure the drive module used.
Monitoring can be switched off by setting machine data ENC_ZERO_MON_ACTIVE
[n]=... N ... encoder number: 1, 2) to 0.
Clear alarm with the Delete key or NC START.
Axis %1 encoder %2 warning %3
%1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding
This alarm occurs only with absolute encoders on the SIMODRIVE 611D, if zero mark
monitoring has been activated for them (cf. $MA_ENC_ZERO_MONITORING): In this
case, the absolute position of the absolute encoder could not be read without any errors:
Breakdown of error fine codings:
(Bit 0 not used)
Bit 1 Parity error
Bit 2 Alarm bit of the encoder
Bit 3 CRC error
Bit 4 Timeout start bit for EnDat transfer is missing
Only display of this alarm, since the absolute position itself is not required at this time for
control/contour.
Frequent occurring of this alarm indicates that absolute encoder transfer or the absolute
encoder itself are faulty and that the absolute value determined with the next encoder
selection or Power On situation could possibly be wrong.
- Alarm display.
1 Alarms
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