The braking chopper has experienced an overcurrent condition, which may be due to a short circuit in the braking resistor or improper sizing of the external resistor. The manual's first action is: “- check whether the braking resistor has a short circuit. - for an external braking resistor, check whether the resistor may have been dimensioned too small.”
- Model
- Siemens G120C
- Display shows
- Power unit: Braking chopper overcurrent (F30055)
- Type
- Fault code
- Source
- Manual p. 740
What F30055 means
Power unit: Braking chopper overcurrent p. 740
Common causes
- An overcurrent condition has occurred in the braking chopper. p. 740
- The braking chopper is only enabled again at pulse enable after the fault has been acknowledged. p. 740
What to do
- - check whether the braking resistor has a short circuit. - for an external braking resistor, check whether the resistor may have been dimensioned too small. p. 740
Before you service the product, read the safety instructions in the manual p. 4.
If F30055 is still not resolved
This page summarises what the manufacturer’s manual says about F30055; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.