LinefixedFault-code library

Fuji Machinery FW3200 fault F81: VFD / inverter: Comm Loss — meaning and fix

Independent resource, not affiliated with Fuji Machinery. Source: manufacturer documentation, p. 96.

What F81 means

Comm Loss.

Likely causes, ranked

  1. RS485 (DSI) port stopped communicatingmost likely

Quick checks

  • If adapter was not intentionally disconnected, check wiring to the port

    Expected: Wiring good

  • Check connection

    Expected: Connection good

Fix

Repair communicationlockout

  1. Replace wiring, port expander, adapters or complete drive as required
  2. If adapter was intentionally disconnected, turn off using A105 (Comm Loss Action)

Safety

Follow your site's lockout procedures before working on the machine. This page does not replace the manufacturer's service.

Related codes

  • F5 · OverVoltage
  • F7 · Motor Overload
  • F38 · Phase U to Gnd
  • F48 · Params Defaulted
  • F71 · Net Loss
  • A.02 · Parameter failure

Every Fuji Machinery FW3200 fault code

Help the next technician

Log what fixed it

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Put this on every machine

A QR code on each machine, cited fixes from the manual and your own plant's history, and a weekly report for the line. Ask for a demo.

Questions

What does F81 mean on a Fuji Machinery FW3200?
Comm Loss.
What causes F81 on the Fuji Machinery FW3200?
RS485 (DSI) port stopped communicating (most likely).
How do I fix F81 on the Fuji Machinery FW3200?
First check: If adapter was not intentionally disconnected, check wiring to the port (expected: Wiring good); Check connection (expected: Connection good). Repair communication: 1) Replace wiring, port expander, adapters or complete drive as required 2) If adapter was intentionally disconnected, turn off using A105 (Comm Loss Action) Lock out the machine first.
Is it safe to fix F81 myself?
Follow your site's lockout procedures before working on the machine. This page does not replace the manufacturer's service. At least one fix here needs the machine locked out and isolated first.

Independent resource, not affiliated with Fuji Machinery. Source: manufacturer documentation, p. 96. Structured paraphrase; no manual text is reproduced.