Siemens SINUMERIK 840Di Diagnostic Manual page 413

11/2006
25022 Axis %1 encoder %2 warning %3
Parameters: %1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding
Definitions: This alarm only occurs with absolute encoders:
a. Warning notice of missing absolute encoder adjustment (on the SIMODRIVE 611D or with
PROFIdrive drives), that is if $MA_ENC_REFP_STATE equals 0. In this case, fine error code 0 is
returned.
b. If a zero mark monitoring has been activated on the SIMODRIVE 611D for the absolute encoder
(see $MA_ENC_ZERO_MONITORING): In this case, the absolute position of the absolute encoder
could not be read without error:
Breakdown of fine error codes:
(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
This alarm is only displayed, as the absolute position itself is not required at this time for
control/contour.
A frequent occurrance of this alarm indicates that the absolute encoder transfer or the absolute
encoder itself is faulty, and that an incorrect absolute value could be determined in one of the next
encoder selection or power on situations.
Reaction: Alarm display.
Remedy: a. Verify encoder adjustment (machine reference ) or readjust encoder.
b. Replace the encoder, replace or screen the encoder cable (or deactivate zero mark monitoring).
Program Clear alarm with the Delete key or NC START.
Continuation:
25030 Axis %1 actual velocity alarm limit
Parameters: %1 = Axis name, spindle number
Definitions: If the axis has at least one active encoder, then the actual speed of the axis is cyclically checked in
the IPO cycle. If there are no errors, the actual velocity can never become greater than specified in
the axis-specific MD 36200 $MA_AX_VELO_LIMIT (threshold for velocity monitoring). This threshold
value in [mm/min, rev/min] is input by an amount that is about 5 to 10% greater than that which can
occur at maximum traversing velocity. Drive errors can result in the velocity being exceeded and the
alarm is then triggered.
The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not
ready).
Reaction: Mode group not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Channel not ready.
Remedy: Please inform the authorized personnel/service department. Check the speed setpoint cable (bus
cable). Check the actual values and direction of position control. Change position control direction if
the axis rotates uncontrollably -> axis-specific MD 32110 ENC_FEEDBACK_POL [n] = < -1, 0, 1 >.
Increase the monitoring limit value in MD 36200 $MA_AX_VELO_LIMIT.
Program Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-413