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Check First When You Have A Trouble; Motor Does Not Start - Mitsubishi Electric FR-F720P-0.75K Instruction Manual

Fr-f700p series.
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Check first when you have a trouble

6.6
Check first when you have a trouble
POINT
· If the cause of malfunction is still unknown after performing applicable checks, initialization of parameter settings
is recommended. Reset the parameter settings and set the required parameters again, then perform the checks
again.
· Where
is indicated in the "Refer to page" column, refer to the Instruction Manual (Applied).
6.6.1

Motor does not start

Check
points
Appropriate power supply voltage is not applied.
(Operation panel display is not provided.)
Main
Circuit
Motor is not connected properly.
The jumper across P/+ and P1 is disconnected.
(55K or lower)
Start signal is not input.
Both the forward and reverse rotation start signals (STF,
STR) are input simultaneously.
Frequency command is zero.
(FWD or REV LED on the operation panel is flickering.)
AU signal is not ON when terminal 4 is used for
frequency setting.
(FWD or REV LED on the operation panel is flickering.)
Input
Signal
Output stop signal (MRS) or reset signal (RES) is ON.
(FWD or REV LED on the operation panel is flickering.)
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. )
Jumper connector of sink - source is wrongly selected.
(FWD or REV LED on the operation panel is flickering.)
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.)
134
Possible Cause
Countermeasures
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.
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. (V/F
control, Simple magnetic flux vector control)
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.
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).
If STF and STR signals are turned ON simultaneously in
the initial setting, a stop command is given.
Check the frequency command source and enter a
frequency command.
Turn ON the AU signal.
Turning ON the AU signal activates terminal 4 input.
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.
Turn ON the CS signal.
Restart operation is enabled when restart after
instantaneous power signal (CS) is ON.
Check that the control logic switchover jumper connector
is correctly installed.
If it is not installed correctly, input signal is not
recognized.
Set Pr. 73, Pr. 267, and a voltage/current input switch
correctly, then input an analog signal in accordance with
the setting.
Refer
to
page
18
11
11
2
20
2
20
23
20

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