Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Communication phase upgrade fault. The drive failed to transition to the next communication phase during the phase upgrade process.
Possible Causes
- Not all slaves acknowledged the phase upgrade command
- Configuration data incomplete for the target phase
- Communication cycle time too short for the new phase
- Device identification mismatch preventing phase upgrade
Troubleshooting Steps
- Step 1: Check which slave(s) did not acknowledge the phase upgrade
All slaves report successful acknowledgment - Step 2: Verify all required configuration data is present for the target phase
All parameters and configurations are loaded - Step 3: Check communication cycle time is sufficient for the new phase requirements
Cycle time meets the minimum for the phase - Step 4: Verify device IDs and types match the master's configuration
All device identifications match
How to Reset
1) Identify non-acknowledging slave(s). 2) Load missing configuration. 3) Adjust cycle time. 4) Verify device IDs. 5) Retry phase upgrade.
Frequently Asked Questions
- Q: How long should a phase upgrade take?
Typically 1-5 seconds. If it takes longer or fails, check for missing configuration or non-responding slaves. Each slave must acknowledge within the timeout period.
- Q: What happens if F4004 occurs during startup?
The drive cannot enter cyclic operation (Phase 4) and the machine cannot start. The startup sequence is halted until the configuration issue is resolved.
Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD