Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Parameter processing initialization fault. The drive failed to initialize its parameter set during startup. The drive cannot enter operational mode.
Possible Causes
- Corrupted parameter set in non-volatile memory
- Parameter set incompatible with firmware version
- Non-volatile memory (EEPROM/Flash) write failure
- Incomplete parameter download from IndraWorks AS
Troubleshooting Steps
- Step 1: Attempt to reload the parameter set from a known-good backup file
Parameters load successfully without errors - Step 2: Verify firmware version is compatible with the parameter file
Firmware version matches or exceeds the minimum required by parameter set - Step 3: Clear non-volatile memory and reload all parameters from scratch
Drive initializes with default parameters, then load application-specific set - Step 4: If parameter loading repeatedly fails, the non-volatile memory may be defective
Control board replacement required
How to Reset
1) Connect IndraWorks AS. 2) Read current parameter set and save as backup. 3) Clear parameters to factory defaults. 4) Reload application parameter set. 5) Power-cycle. Caution: Always maintain a parameter backup to prevent data loss.
Frequently Asked Questions
- Q: How do I prevent parameter corruption?
Always maintain a parameter backup file. After any parameter change, save the complete set to a file on your engineering PC.
- Q: Can I recover parameters from a failed control board?
No. If the non-volatile memory is defective, parameters cannot be read. Always keep an external backup of the parameter set.
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Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD
Published: 2026-10-18
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