Siemens SINUMERIK 840D sl Series Diagnostics Manual page 373

08/2005
- Channel not ready.
Remedy: 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 36310
ENC_ZERO_MONITORING [n]=... N ... encoder number: 1, 2) is set to 0.
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25021
Axis %1 zero mark monitoring of passive encoder
Parameters: %1 = Axis name, spindle number
Definitions: 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!
Reactions: - Alarm display.
Remedy: 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.
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
25022
Axis %1 encoder %2 warning %3
Parameters: %1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding
Definitions: 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
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
Overview of Alarms
2-373