72 M301L
FAULT MESSAGES
FAULT DESCRIPTION POSSIBLE CAUSES
CONTROL Control Board fault:
New software has been installed
that is different from the
previous version.
Perform a factory reset using
Parameter 65-PROGRAM.
This will update the software and allow
the fault to be reset.
INTERNAL
INTERN (#)
Internal fault:
The micro-processor has sensed
a problem.
Electrical noise on control wiring.
Defective microprocessor.
FOLLOWER Loss of Follower fault:
4-20 mA signal at TB-5B is
below 2 mA.
Parameter 55 - TB5B LOSS is
set to FAULT.
Blank Display
or repeatedly
flashes
TESTING
The power supply has shut
down.
This can be the result of clogged
or failed heatsink fans.
Check heatsink fans (if equipped).
Clear any obstructions.
If heatsinks are not clogged,
contact the Lenze AC Tech Service
Department.
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