6-8
CPF21
Option CPU Down
Self-diagnosis Fault of
Option Board
Noise or spike was on the com-
munication line and/or defective
option board.
Perform an initialization to
factory defaults.
Cycle the power to the
Inverter
Replace the option board
Replace the Inverter
CPF22
Option Type Err
Option Board Code Number
Fault
Unrecognizable option board is
connected to the control board.
Remove any option boards
Perform an initialization to
factory defaults
Cycle the power to the
Inverter
Replace the option board
Replace the Inverter
CPF23
Option DPRAM Err
Option Board
Interconnection Fault
An option board was not correctly
connected to the control board, or
an option board that was not made
for the Inverter is attached to the
control board.
Turn off the power and rein-
stall the option board again
Perform an initialization to
factory defaults
Cycle the power to the
Inverter
Replace the option board
Replace the Inverter
Table 6.1 Fault Detection (Continued)
Display Meaning Probable Causes Corrective Actions
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