Joint 2 Encoder Error

ABB Robotics Robot Critical Robot

Model: ABB IRB 2600 Robot | Code: ABB 50021

Applicable Systems
IRB 2600 IRB 4600 IRB 6700 IRB 1200 IRC5 Controller

Symptoms

Joint 2 absolute encoder signal fault; robot cannot determine joint 2 position; motion stopped.

Possible Causes

  • Encoder cable connector loose at joint 2
  • Encoder cable damaged from repeated flexing
  • Encoder internal failure

Troubleshooting Steps

  1. Step 1: Check encoder cable at joint 2 connector
    Connector seated and clean
  2. Step 2: Inspect encoder cable for flex damage
    Cable intact, no broken conductors
  3. Step 3: Check encoder signal at IRC5 drive module
    Signal present and stable
  4. Step 4: Replace encoder cable if damaged
    New cable signal clean
  5. Step 5: Remaster joint 2 after cable/encoder replacement
    Joint 2 mastered correctly

How to Reset

Reset via FlexPendant; requires joint remastering after encoder service.

Common Replacement Parts

  • Joint 2 Encoder Cable
  • Resolving Arm (if encoder integrated)

Frequently Asked Questions

  • Q: What is ABB robot mastering?

    Establishing joint zero positions using mechanical alignment marks or mastering tools. Required after encoder/motor replacement or after collision.

Related ABB Robotics Fault Codes

Source: ABB Robotics application manual

Category: Robot