Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300702

Siemens 300702 - Axis drive base cycle time invalid

This alarm occurs when the base cycle time set on the NC is too high for the drive, often due to incorrect configuration or parameter settings. Adjust the cycle time or related parameters to resolve it.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300702

Siemens 300702 - Axis drive base cycle time invalid

Axis drive base cycle time invalid

The base cycle time set on the NC was too high for the drive Control reaction: NC 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.

Root Cause Summary

This alarm occurs when the base cycle time set on the NC is too high for the drive, often due to incorrect configuration or parameter settings. Adjust the cycle time or related parameters to resolve it.

Safety

  • Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Causes and Fixes

  1. 1

    SAFETY: Power down and lockout

    Follow LOTO procedures. Power down the machine and ensure all energy sources are isolated before accessing parameters.

  2. 2

    Check cycle time parameter

    Access the NC parameters and locate the base cycle time setting for the affected axis/drive (typically MD1100 or similar).

  3. 3

    Adjust value with caution

    Reduce the base cycle time to a value within the drive's specified range. Document original values before changes. Typical range: 1-8ms depending on drive model.

  4. 4

    Safe restart procedure

    Clear the alarm, perform controlled restart following manufacturer procedures. Test axis movement at reduced speeds initially.

Service Recommendedmedium confidence

Call a technician if:

  • ·Before making any parameter changes if unfamiliar with NC configuration
  • ·If adjusting the cycle time does not resolve the alarm
  • ·If drive firmware or hardware compatibility issues are suspected
  • ·If multiple alarms occur simultaneously

Prevention

  • Verify cycle time settings during initial setup
  • Cross-check NC and drive compatibility before configuration

Common Mistakes

  • Overlooking drive-specific limitations
  • Setting cycle times without consulting manuals

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Always verify with your machine manual or a certified technician before performing service procedures.