Applicable Systems
CPX-FVDA-P

Symptoms

The Festo CPX terminal reports fault code 145 indicating a built-in self-test failure. During the module's periodic self-test, an internal fault was detected. This is a critical internal fault indicating the module's safety integrity is compromised. All output channels are passivated immediately.

Possible Causes

  • Internal microcontroller failure detected during self-test
  • Safety comparator circuit failure between dual processors
  • Internal oscillator or timing circuit drift detected
  • EPROM or firmware checksum failure

Troubleshooting Steps

  1. Step 1: Check CPX diagnostic display or module fault LED for fault code 145
    Fault code 145 displayed, module fault LED illuminated red
  2. Step 2: Power cycle the UVAL load voltage supply to the module
    Power removed and reapplied to module
  3. Step 3: Observe if fault code 145 clears after power cycle
    Fault still present after power cycle
  4. Step 4: If fault persists, replace the CPX-FVDA-P module with same revision
    Replacement module installed, fault does not appear on new module

How to Reset

To reset: 1) Reconnect the power supply voltage UVAL (power cycle). 2) The module restarts and re-runs self-test. 3) If fault persists, the module must be replaced. Caution: A module with persistent self-test failure cannot be repaired - its safety certification is void.

Frequently Asked Questions

  • Q: Can I repair a CPX-FVDA-P module with fault 145?

    No. The Festo manual states: 'Module contains no serviceable parts. Repairs are prohibited! Unauthorized repairs invalidate the module's safety certification.' The module must be returned to Festo.

  • Q: What revision of replacement module do I need?

    Check the revision code on the original module's nameplate. The replacement must be the same or newer revision. Also verify the bus node revision is Rev 18 or higher for CPX-FVDA-P compatibility.

Related Festo Fault Codes

Source: Festo CPX-FVDA-P System Manual, Document P.BE-CPX-SYS-F-ZH zh 1011NH (festo.com)

Category: Hydraulic & Pneumatic