KUKA Robot codes
AxisMD

axismd.ai

KUKA Robot Controller

Servo/Axis · Intermediate

Alarm KRC0100

KUKA Robot KRC0100 - RDW Boot Up Failure

This alarm indicates the Robot Drive Watchdog (RDW) subsystem on the KRC4/KRC5 controller failed to initialize properly during the boot sequence. The RDW is a critical safety monitoring system that supervises servo drive communication and motion control. Without successful RDW initialization, the controller cannot enable drives or execute motion commands.

KUKA RobotServo/AxisIntermediate

KRC0100

KUKA Robot KRC0100 - RDW Boot Up Failure

RDW Boot Up Failure

This alarm indicates the Robot Drive Watchdog (RDW) subsystem on the KRC4/KRC5 controller failed to initialize properly during the boot sequence. The RDW is a critical safety monitoring system that supervises servo drive communication and motion control. Without successful RDW initialization, the controller cannot enable drives or execute motion commands.

Common Causes

  • Corrupted RDW firmware or missing boot files in the KRC boot partition due to improper shutdown or storage failure
  • Communication failure on the internal SERCOS or EtherCAT ring between KPC and drive modules during power-up
  • Defective RDW hardware module or KPP (KUKA Power Pack) communication board requiring replacement
  • Incorrect voltage supply to drive modules preventing proper initialization handshake with RDW system
  • Configuration mismatch in machine data files after WorkVisual project restore or version incompatibility

Troubleshooting Steps

  1. 1Step 1: Perform a controlled shutdown and cold restart with all E-Stop circuits verified clear to allow clean boot sequence
  2. 2Step 2: Check event log in Diagnosis > Logbook for detailed RDW error sub-codes and communication timeout messages
  3. 3Step 3: Verify 600VDC bus voltage is present and stable using Diagnosis > Drive > DC-Link display before boot
  4. 4Step 4: Inspect all X30 SERCOS or EtherCAT fiber/copper cables between KPC and drive modules for damage or poor connection
  5. 5Step 5: Access Service > System Info and verify RDW firmware version matches KSS version, update if mismatch detected using KUKA Recovery Stick
  6. 6Step 6: Contact KUKA support to verify machine data integrity and consider KPP or drive module hardware replacement if communication remains failed

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.