5-10
LED display Description Possible causes Corrective action
FB
( flash )
PID feedback
breaking
PID feedback breaking:
PID feedback breaking
detection is enabled (when
10-11=1), keep on operation,
and PID feedback inputs the
PID feedback breaking
detection time (10-13)of PID
feedback breaking level.
PID feedback signal (such as
the transformer) does not
act or is incorrectly
installed.
.Check the set PID feedback
method is correct or not.
.Ensure correct installation
and the proper operation of
PID feedback signals.
USP
( flash )
Unattended
Start Protection
Unattended Start Protection
（USP）is enabled (enabled in
booting)
. USP in booting (set by
multi-function digital input) is
enabled, the inverter will not
accept any operation
command.
. Before the warning
information is removed, the
inverter can’t enter the
operating mode. (Please
refer to related instructions in
the full manual 03-00 - 03-08
= 50)..
.Operation command is
turned off, or terminal reset
operation is performed
(03-00 to 03-07 are 3), or
use the RESET key on the
digital operator to reset..
.Close the USP signal and
restart the power.
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