Siemens SINAMICS V20 VFD
Siemens SINAMICS V20 VFD code A911: Vdc_max controller active
The maximum voltage controller is actively keeping the direct current link voltage below the specified limit while the booth runs.
- Code
- A911
- Name
- Vdc_max controller active
- Controller
- Siemens SINAMICS V20 VFD
- Type
- High voltage
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- What the manual says to do, and the page it is on
- The 1 common cause listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Siemens SINAMICS V20 VFD code A911 mean?
The maximum voltage controller is actively keeping the direct current link voltage below the specified limit while the booth runs.
Is Siemens SINAMICS V20 VFD code A911 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Siemens SINAMICS V20 VFD code A911?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
Other Siemens SINAMICS V20 VFD codes
A535 · Braking resistor overloadA541 · Motor data identification activeA600 · RTOS overrun warningA910 · Vdc_max controller deactivatedA912 · Vdc_min controller activeA921 · Analog output parameters not set properlA922 · No load applied to converterA923 · Both JOG left and JOG right are requesteA930 · Cavitation protection warnA936 · PID autotuning active