Fireye NX6100 F20 drive position fault during purge, what to check?
I'm getting an F20 drive position fault on my Fireye NX6100 during the purge cycle. The actuator seems to be struggling a bit. What should I check first?
A Fireye NX6100 F20 fault indicates a drive position error, meaning a fuel or air drive is not at its expected position according to the commissioned profile. This can occur during startup (proving close or purge positions) or while firing (maintaining fuel/air ratio). The fault causes a non-volatile lockout of the burner and requires troubleshooting based on the specific drive and subset code.
Likely causes and checks
1Linkage or damper binding
- Points to it
- Mechanical binding in the linkage or damper can prevent the drive from reaching its commanded position, especially during purge or modulation. The actuator may labor or stall.
- Check
- With the burner off and by qualified personnel, disconnect the linkage and manually stroke the damper or valve to check for any binding. Also, inspect couplings for slippage.
2Stored close or purge position no longer reachable
- Points to it
- If mechanical work or a servo replacement has occurred, the previously commissioned close or purge positions might no longer be physically achievable by the drive, leading to a fault before the drives reach purge.
- Check
- Check the feedback potentiometers and motor micro-switches. If these are fine, you may need to reset the close and purge positions in Commission Ratio mode.
3CANbus fault
- Points to it
- A communication error on the CANbus can prevent the controller from accurately reading or commanding the drive's position. This often presents with 'ERR1' under the drive name and a slow or freezing display.
- Check
- Inspect the CANbus wiring, screens, and termination to the servo for any issues.
4Servo internal fault
- Points to it
- An internal malfunction within the servo itself can cause repeated positioning errors on that specific drive. This is indicated by 'ERR2' through 'ERR7' under the drive name.
- Check
- If the fault consistently recurs on the same servo, the servo likely needs replacement. Note that replacing a servo invalidates existing profiles until re-commissioned (F64 fault).
Next check: Given the actuator struggles during purge, start by checking for linkage or damper binding. Disconnect the linkage and manually stroke the damper or valve to ensure smooth movement, and check couplings for slip.
Related questions
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