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Protective functions

Check
points
Input
signal
Parameter
Setting
FR-A800
Possible cause
CS signal is OFF while the automatic restart
after instantaneous power failure function is
selected (Pr. 57 "Restart coasting time" ≠ 9999).
(FWD or REV LED on the operation panel is
flickering.)
Jumper connector of sink - source is incorrectly
selected. (FWD or REV LED on the operation
panel is flickering.)
Wiring of encoder is incorrect.
(Under encoder feedback control or vector
control)
Voltage/current input switch is not correctly set
for analog input signal (0 to 5 V/0 to 10 V, 4 to
20 mA). (FWD or REV LED on the operation
panel is flickering.)
STOP/RESET key was pressed.
(Operation panel indication is "PS".)
For the separated converter type, terminals
RDA and SE of the converter unit are not
connected to terminals MRS (X10 signal) and
SD (PC for source logic) of the inverter
respectively.
Two-wire or three-wire type connection is
incorrect.
Under V/F control, Pr. 0 "Torque boost" setting
is improper.
Pr. 78 "Reverse rotation prevention selection" is
set.
Pr. 79 "Operation mode selection" setting is
incorrect.
Bias and gain (calibration parameter C2 to C7)
settings are improper.
Pr. 13 "Starting frequency" setting is greater
than the running frequency.
Frequency settings of various running
frequency (such as multi-speed operation) are
zero.
Especially, Pr. 1 "Maximum frequency" is zero.
Pr. 15 "Jog frequency" is lower than Pr. 13
"Starting frequency" for JOG operation.
The Pr. 359 (852) "Encoder rotation direction"
setting is incorrect under encoder feedback
control or under vector control.
When a vector control option is used, the
option to be used and parameter settings do
not match.
Operation mode and a writing device do not
correspond.
Check first when you have a trouble
Countermeasure
Turn ON the automatic restart after
instantaneous power failure/flying start (CS)
signal.
When the CS signal is assigned to an input
terminal, automatic restart operation is
enabled when the CS signal is turned ON.
Check that the control logic switchover jumper
connector is correctly installed.
If it is not installed correctly, input signal is not
recognized.
Check the wiring of encoder.
Set Pr. 73 "Analog input selection", Pr. 267
"Terminal 4 input selection", and a voltage/
current input switch correctly, then input an
analog signal in accordance with the setting.
During the External operation mode, check the
method of restarting from a STOP/RESET key
input stop from PU.
Check for the wiring.
Check the wiring.
Use the Start self-holding selection (STP
(STOP)) signal when the three-wire type is used.
Increase the Pr. 0 setting by 0.5% increments
while observing the rotation of a motor.
If that makes no difference, decrease the
setting.
Check the Pr. 78 setting.
Set Pr. 78 when you want to limit the motor
rotation to only one direction.
Select the operation mode which corresponds
with input methods of start command and
frequency command.
Check the bias and gain (calibration parameter
C2 to C7) settings.
Set running frequency higher than Pr.13.
The inverter does not start if the frequency
setting signal is less than the value set in Pr. 13.
Set the frequency command according to the
application.
Set Pr. 1 higher than the actual frequency used.
Set Pr. 15 higher than Pr. 13.
If the "REV" on the operation panel is lit even
though the forward-rotation command is
given, set Pr. 359 (852) = "1".
Correctly set Pr. 862 "Encoder option selection"
according to the option to be used.
"
Check Pr. 79
Operation mode selection
Pr. 338 "Communication operation command
source", Pr. 339 "Communication speed
command source", Pr. 550 "NET mode
operation command source selection" and
Pr. 551"PU mode operation command source
selection", and select an operation mode
suitable for the purpose.
Refer to
page
5-562
2-40
2-67
5-389
5-194,
6-14
Refer to
the In-
struction
Manual
(Hard-
ware) of
the FR-
A802.
5-430
5-652
5-281
5-263
5-401
5-251,
5-253
5-189,
5-310
5-251,
5-253,
5-286
2-73,
5-692
5-64
"
,
5-263,
5-274
6 - 37

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