When this warning pops up on the controller display, the compressor usually continues its structural cycle, but data logging halts. Resolving this issue immediately protects your machine's service history, facilitates fast troubleshooting, and avoids high service costs. 📋 Direct Troubleshooting Matrix
Wipe the gold pins on the SD card with a lint-free cloth dipped in isopropyl alcohol (99%).
[Sigma Control 2 Controller Unit] │ (Slot X5 Interface) │ ┌──────────┴──────────┐ ▼ ▼ [Hardware Block] [Logical/File Block] ├── Physical Lock ├── FAT32 Corruption └── Defective Pins └── Memory Exhaustion kaeser sd card write error top
Re-insert the card firmly until it clicks, close the cabinet, and power the machine back up to see if the error clears. Step 2: Clean the Memory Card Contacts
Push the card in gently to trigger the spring release, then pull it straight out. Step 2: Check the Physical Lock Switch When this warning pops up on the controller
Contact your local Kaeser service partner to inspect the control module. How to Prevent Future SD Card Errors
The Sigma Control unit triggers this specific fault for three main reasons: [Sigma Control 2 Controller Unit] │ (Slot X5
Clean the contacts gently using an isopropyl alcohol wipe (99% concentration) and let it dry completely.
Kaeser compressors and controllers that use SD cards can sometimes show write errors that interrupt logging, firmware updates, or configuration saves. This post explains common causes, step-by-step fixes, and preventive measures so you can quickly restore functionality and avoid repeat problems.
The physical SD card has its write-protection switch toggled to the "Locked" position.