76 ACS 300 User’s Manual
Chapter 8 - Fault Tracing
(5) LOW AI-SIGNAL Analogue input less than 2 V/
4mA and minimum has been
set to
2 V/4 mA or Analogue Input
less than selected “customized
minimum”.
• Input reference has failed or
control wire is broken. Check
the reference circuit.
(6) PANEL COM ERR Control Panel was removed
when control was in Local
mode. Due to safety reasons,
the drive stops in this fault con-
dition.
• Attach the Control Panel and
reset the fault, then change to
Remote mode and remove
Panel.
• Use remote (wired) controls to
reset the fault, then start and
run with remote controls
• There might be a loose con-
tact. Check the panel connec-
tion.
(10) BUS COMM FLT Bus communication error • Check bus connections
(7) UNIT FAULT ACS 300 heatsink tempera-
ture too high.
CHECK:
• Heatsink dissipation
• Dust and dirt
• Air flow
•Fan
• Ambient temperature
• Reduce switching frequency.
• Check load current
Ground faults or short circuits. CHECK:
• Terminals
• Motor
• Wiring
With frame size R2 high load
inertia / short ramp
CHECK:
• Ramps times
• Remove mechanical problems
• Dimensioning
Fault indication Possible cause Remedy
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