Check First When You Have A Trouble; Motor Does Not Start - Mitsubishi Electric 800 Series Instruction Manual

2.6

Check first when you have a trouble

For Real sensorless vector control, also refer to the troubleshooting on speed control and torque control in the FR-E800
Instruction Manual (Function).
• If the cause is still unknown after every check, it is recommended to initialize the parameters, set the required parameter values
and check again.
2.6.1

Motor does not start

Check
Possible cause
point
An appropriate power supply voltage is
not applied.
(The operation panel display is not
operating.)
Main
circuit
The motor is not connected properly.
The jumper across P/+ to P1 is
disconnected.
A DC reactor (FR-HEL) is not connected.
A start signal is not input.
Both the forward and reverse rotation
start signals (STF/DI0, STR/DI1) are
input simultaneously.
Frequency command is zero. (The [RUN]
LED indicator on the operation panel is
blinking.)
The AU signal is not ON when terminal 4
is used for frequency setting. (The [RUN]
indicator on the operation panel is
blinking.)
The Output stop (MRS) signal or Inverter
Input
reset (RES) signal is ON.
signal
(The [RUN] LED indicator on the
operation panel is blinking.)
The switch setting for selecting sink logic
or source logic is incorrect. (The [FWD] or
[REV] LED indicator on the operation
panel is blinking.)
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
[RUN] LED indicator on the operation
panel is blinking.)
The STOP/RESET key was pressed.
(The operation panel indication is "PS".)
Power on a molded case circuit breaker (MCCB), an earth leakage circuit breaker
(ELB), or a magnetic contactor (MC).
Check for the decreased input voltage, input phase loss, and wiring.
If only the control power is ON when using a separate power source for the control
circuit, turn ON the main circuit power.
Check the wiring between the inverter and the motor.
If the electronic bypass function is active, check the wiring of the magnetic contactor
(MC) between the inverter and the motor.
Securely fit a jumper across P/+ and P1.
When using a DC reactor (FR-HEL), remove the jumper across P/+ to P1, and then
connect the DC reactor.
Check the start command source, and input a start signal.
Turn ON only one of the forward and reverse rotation start signals (STF/DI0 or STR/
DI1).
When the STF/DI0 and STR/DI1 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.
Check that the control logic switch is set correctly.
If it is not set correctly, the input signal is not recognized.
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 after the
operation is stopped using the STOP/RESET key on the PU.
Countermeasure
2. Protective Functions
2.6 Check first when you have a trouble
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