Mitsubishi Electric 700 Series, Instruction Manual

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347
Check first when you have a trouble
5
P
R
OTEC
TI
V
E
FUNCTIONS
5.5 Check first when you have a trouble
5.5.1 Motor does not start
Check
points
Possible Cause Countermeasures
Refer
to
page
Main
Circuit
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.
25
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.
16
The jumper across P/+ and P1 is disconnected.
(FR-F720-02330 (01160) or less)
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.
16
Input
Signal
Start signal is not input.
Check the start command source, and input a start
signal.
PU operation mode: /
External operation mode : STF/STR signal
197
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.
27
Frequency command is zero.
(FWD or REV LED on the operation panel is flickering.) Check the frequency command source and enter a
frequency command.
197
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.
171
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.
152
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.
152
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.
30
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. 27
was pressed.
(Operation panel indication is (PS).)
During the External operation mode, check the method
of restarting from a input stop from PU.
336
Two-wire or three-wire type connection is wrong.
Check the connection.
Connect STOP signal when three-wire type is used.
126