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Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual Page 765

Fr-a800 series.
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Check
point
A start signal is not input.
Both the forward and reverse rotation start
signals (STF, STR) are input
simultaneously.
Frequency command is zero. (The [FWD] or
[REV] LED indicator on the operation panel
is blinking.)
The AU signal is not ON when terminal 4 is
used for frequency setting. (The [FWD] or
[REV] LED indicator on the operation panel
is blinking.)
The Output stop (MRS) signal or Inverter
reset (RES) signal is ON.
(The [FWD] or [REV] LED indicator on the
operation panel is blinking.)
The CS signal is OFF while the automatic
restart after instantaneous power failure
function is selected (Pr.57 Restart
coasting time≠ 9999). (The [FWD] or
Input
[REV] LED indicator on the operation panel
signal
is blinking.)
The jumper connector for selecting sink
logic or source logic is incorrectly installed.
(The [FWD] or [REV] LED indicator on the
operation panel is blinking.)
The wiring of the encoder is incorrect.
(Under encoder feedback control or vector
control)
The voltage/current input switch is not
correctly set for the analog input signal (0 to
5 V, 0 to 10 V, or 4 to 20 mA). (The [FWD]
or [REV] LED indicator on the operation
panel is blinking.)
The
(The 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.
766
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
Possible cause
key was pressed.
Countermeasure
Check the start command source, and input a start signal.
PU operation mode:
/
External operation mode: STF/STR signal
Turn ON only one of the forward and reverse rotation start signals
(STF or STR).
When the STF and STR signals are turned ON simultaneously in
the initial setting, a stop command is given.
Check the frequency command source and input a frequency
command.
Turn ON the AU signal.
Turning ON the AU signal activates terminal 4 input.
Turn the MRS or RES signal OFF.
The inverter starts the operation with a given start command and a
frequency command after turning OFF the MRS or RES signal.
Before turning OFF, ensure the safety.
Turn ON the Selection of 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, the input signal is not recognized.
Check the wiring of the 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
input stop from PU.
Check for secure wiring connections.
Refer to
page
373
68
373
473
68
597
72
90
473
321,
749
Refer to the
Instruction
Manual
(Hardware)
of the FR-
A802.

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