Siemens SINUMERIK 840Di Diagnostic Manual page 704

Overview of Alarms
SIMODRIVE alarms
300504 Axis %1 drive %2 measuring circuit error of motor measuring system
Parameters: %1 = NC axis number
%2 = Drive number
Definitions: Signal level of the motor encoder too low or disturbed.
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 encoders, encoder lines and connectors between drive motor and 611D module.
- Check for temporary interruptions (loose contact) caused, for example, by movements in trailing
cable.
- Check the shield connection of the front plate of the closed-loop control module (top screw).
- Use original, preassembled encoder cable from Siemens (high degree of shielding).
- If necessary, replace the motor, encoder and/or cables.
- With linear motor, check the signal level; possibly, the measuring scale of the open measuring
system is polluted.
- For a gearwheel encoder, check the distance between the gearwheel and the sensor. Replace the
sensor or the defective gearwheel.
- Replace the control module.
- Check the metallized intermediate circuit cover.
Program Switch control OFF - ON.
Continuation:
2-704
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006