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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 75060 - MCSC: tolerance window exceeded axis
Alarm 75060 indicates a closed-loop servo control error where a slave axis in a coupled-motion (CC) configuration has drifted beyond the permissible position tolerance relative to its master axis. This occurs when actual position feedback from the slave axis encoder/resolver exceeds the window defined in MD35100 (CC_TOLERANCE_WINDOW) or equivalent axis-specific tolerance parameters.
75060
Siemens 75060 - MCSC: tolerance window exceeded axis
MCSC: tolerance window exceeded axis
The actual position value difference between the CC_Slave axis indicated in the alarm message and its CC_Master axis is outside the configured tolerance window Control reaction: NC Start disable in this channel. Alarm display. NC Stop on alarm.
Root Cause Summary
Alarm 75060 indicates a closed-loop servo control error where a slave axis in a coupled-motion (CC) configuration has drifted beyond the permissible position tolerance relative to its master axis. This occurs when actual position feedback from the slave axis encoder/resolver exceeds the window defined in MD35100 (CC_TOLERANCE_WINDOW) or equivalent axis-specific tolerance parameters.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
Access Siemens HMI or NCK parameter editor. Navigate to Machine Data > Axis > Servo > MD35100 (CC_TOLERANCE_WINDOW). Document current value in machine units (typically 0.001-0.1mm for linear axes).
- 2
Review the part program and identify the offending axis pair (shown as %2 in alarm message). Increase MD35100 incrementally by 20-30% and monitor alarm occurrence during identical motion profile. Typical adjustment range: 0.005mm to 0.05mm depending on axis inertia and load.
Do not exceed machine tool design limits; consult OEM specifications for maximum recommended tolerance.
- 3
If tolerance adjustment resolves alarm but introduces unacceptable part tolerance, instead optimize servo loop gain parameters: MD32000 (SERVO_GAIN_P), MD32010 (SERVO_GAIN_I), MD32020 (SERVO_GAIN_D) to improve slave axis response and reduce lag.
- 4
Verify CC coupling definition in part program (G36.1 or COUPLE_AXES function) and confirm slave/master axis assignment matches configured parameters. Log actual position values (NCK diagnostics or PLC variable trace) during alarm to quantify overshoot magnitude.
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