Siemens SINUMERIK codes
AxisMD

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300720

Siemens 300720 - Axis drive maximum motor speed invalid

Because of the high maximum motor speed in the drive MD 1401: $MD_MOTOR_MAX_SPEED and the speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME sufficiently high speeds can occur to cause a format overflow. Example: A motor speed of 480,000 rpm can still be processed without error at a speed controller cycle time of 125 µs 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.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300720

Siemens 300720 - Axis drive maximum motor speed invalid

Axis drive maximum motor speed invalid

Because of the high maximum motor speed in the drive MD 1401: $MD_MOTOR_MAX_SPEED and the speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME sufficiently high speeds can occur to cause a format overflow. Example: A motor speed of 480,000 rpm can still be processed without error at a speed controller cycle time of 125 µs 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.

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.

Common Causes

  • Because of the high maximum motor speed in the drive MD 1401: $MD_MOTOR_MAX_SPEED and the speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME sufficiently high speeds can occur to cause a format overflow.
  • Example: A motor speed of 480,000 rpm can still be processed without error at a speed controller cycle time of 125 µs

Troubleshooting Steps

  1. 1Please inform the authorized personnel/service department.
  2. 2Reduce the maximum motor speed MD 1401: $MD_MOTOR_MAX_SPEED (speed for the maximum useful motor speed) or set a smaller speed controller cycle in MD 1001: $MD_SPEEDCTRL_CYCLE_TIME (speed controller cycle).
  3. 3Switch control OFF - ON

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