Siemens Sinumerik 840C Diagnostics Manual page 32

1 Alarms
1.5.1 Alarm description
132* Closed-loop system hardware axis
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Scan
Cyclic
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Effect
Interlocking of NC START
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Interlocking of Mode Group Ready
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Setpoint = 0
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The control enable is removed after the time stored in NC machine data "Control enable cutout delay" has
elapsed
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Follow-up operation
Explanation
The measuring circuit difference signals.
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Are not in phase
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Have a fault to earth
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Are completely missing
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Remedy
Check whether the measuring circuit connector has been plugged in
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By plugging in the measuring circuit short-circuit connector it is possible to check whether the measuring cir-
cuit group is in working order
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Check the difference signals using an oscilloscope
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Replace the encoders
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Check NC MD 200*, 384*
The alarm can only be cancelled by POWER ON.
136* Contamination measuring system axis
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Scan
Cyclic
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Effect
Interlocking of NC START
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Interlocking of Mode Group Ready
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Machining stops
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Explanation
On measuring systems with a contamination signal (e.g. EXE) an error is sent to the NC from the measuring
system.
Remedy
Check the measuring system in accordance with the manufacturer's instructions.
140* Pulse code monitoring
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Scan
Cyclic
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Effect
Interlocking of Mode Group Ready
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Interlocking of NC START
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Alarm leads to machining stop
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Explanation
Transmission errors or noise from encoder
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Remedy
Check encoder, cable, connector
144* Zero mark monitoring responded
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Scan
Cyclic
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Effect
Interlocking of NC START
Explanation
Transmission errors, noise or excessive speed have caused pulses to be lost relating to an encoder revolution
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Remedy
Check encoder pulses
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Check transmission path
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Switch off monitoring system briefly with MD 1820* bit 1=0
148* SW limit switch plus
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Scan
With each axis movement
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Effect
Machining stops
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Interlocking of NC START
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Explanation
The software limit switch only becomes active after approach to reference point.
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Depending on the PLC interface signal "Second software limit switch active", the first or the second limit switch
has been approached.
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Remedy
Traverse away from the limit switch in the opposite direction in JOG mode.
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Check the values in machine data for software limit switches.
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Siemens AG 2001 All rights reserved 6FC5198–jAB40
SINUMERIK 840C / SIMODRIVE 611–D (DA)
04/96
POWER ON
POWER ON
Reset key
Reset key
Reset key