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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 300715 - Axis drive maximum power section current less than or equal to
This alarm occurs when the maximum current of the power section in drive MD 1107 is set to zero or less, typically due to incorrect parameter configuration. Fix it by entering a valid positive value for the current limit.
300715
Siemens 300715 - Axis drive maximum power section current less than or equal to
Axis drive maximum power section current less than or equal to
The maximum current of the power section entered in drive MD 1107: $MD_INVERTER_MAX_CURRENT (transistor limit current) is less than or equal to zero 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 maximum current of the power section in drive MD 1107 is set to zero or less, typically due to incorrect parameter configuration. Fix it by entering a valid positive value for the current limit.
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
Access drive parameters
Navigate to the drive configuration menu on the Siemens control.
- 2
Check MD 1107 value
Verify the value of $MD_INVERTER_MAX_CURRENT and ensure it is a positive number.
- 3
Update and save
Enter a valid positive current limit value, save changes, and reset the alarm.
Call a technician if:
- ·If parameter changes do not resolve the alarm
- ·If access to drive parameters is restricted or unclear
Prevention
- Double-check parameter values during setup
- Document custom parameter settings for reference
Common Mistakes
- Entering zero or negative values in MD 1107
- Overlooking parameter validation after system updates
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
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