Справочник Пользователя для Mitsubishi Electronics FR-A700

Refer to troubleshooting on 

page  110 (speed control), page  131 (torque control) and page  143 (position control) in

addition to the following check points.

· If the cause is still unknown after every check, it is recommended to initialize the parameters (initial value) then reset the

required parameter values and check again.

Appropriate power supply voltage is not applied.
(Operation panel display is not provided.)

Power ON a moulded 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.

Motor is not connected properly.

Check the wiring between the inverter and the motor.
If commercial power supply-inverter switchover function is 
active, check the wiring of the magnetic contactor 
connected between the inverter and the motor.

The jumper across P/+ and P1 is disconnected.
(55K or lower)

Securely fit a jumper across P/+ and P1.
When using a DC reactor (FR-HEL), remove the jumper 
across P/+ and P1, and then connect the DC reactor.

Start signal is not input.

Check the start command source, and input a start signal.

PU operation mode: 

/

External operation mode : STF/STR signal

Both the forward and reverse rotation start signals (STF, 
STR) are input simultaneously.

Turn ON only one of the forward and reverse rotation start 
signals (STF or STR).
If STF and STR signals are turned ON simultaneously in 
the initial setting, a stop command is given.

Frequency command is zero.
(FWD or REV LED on the operation panel is flickering.)

Check the frequency command source and enter a 
frequency command.

AU signal is not ON when terminal 4 is used for 
frequency setting.
(FWD or REV LED on the operation panel is flickering.)

Turn ON the AU signal.
Turning ON the AU signal activates terminal 4 input.

Output stop signal (MRS) or reset signal (RES) is ON.
(FWD or REV LED on the operation panel is flickering.)

Turn MRS or RES signal OFF.
Inverter starts the operation with a given start command 
and a frequency command after turning OFF MRS or RES 
signal. 
Before turning OFF, ensure the safety.

CS signal is OFF when automatic restart after 
instantaneous power failure function is selected (Pr. 57 

≠ 

"9999").
(FWD or REV LED on the operation panel is flickering. )

Turn ON the CS signal.
Restart operation is enabled when restart after 
instantaneous power signal (CS) is ON.

Jumper connector of sink - source is wrongly selected.
(FWD or REV LED on the operation panel is flickering.)

Check that the control logic switchover jumper connector is 
correctly installed.
If it is not installed correctly, input signal is not recognized.

Wiring of encoder is incorrect.
(Under encoder feedback control or  vector control)

Check the wiring of encoder.

Voltage/current input switch is not correctly set for analog 
input signal (0 to 5V/0 to 10V, 4 to 20mA).
(FWD or REV LED on the operation panel is flickering.)

Set Pr. 73, Pr. 267, and a voltage/current input switch 
correctly, then input an analog signal in accordance with 
the setting.