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

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Check first when you have a trouble Protective functions
6 - 40
6.6 Check first when you have a trouble
For Real sensorless vector control and vector control, also refer to the troubleshooting on page 5-113
(speed control), page 5-152 (torque control), and page 5-191 (position control).
6.6.1 Motor does not start
NOTE If the cause is still unknown after every check, it is recommended to initialize the parameters, set
the required parameter values and check again.
Check
points
Possible cause Countermeasure
Refer to
page
Main
circuit
Appropriate power supply voltage is not
applied.
(Operation panel display is not provided.)
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.
2-57
Motor is not connected properly.
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.
2-34
The jumper across P/+ to P1 is disconnected.
A DC reactor (FR-HEL) is not connected.
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.
Connect the DC reactor securely when required
according to the capacity.
2-34,
2-101
Input
signal
Start signal is not input.
Check the start command source, and input a
start signal.
PU operation mode: FWD key/REV key
External operation mode: STF/STR signal
5-273
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).
When the STF and STR signals are turned ON
simultaneously in the initial setting, a stop
command is given.
2-44
Frequency command is zero. (FWD or REV LED
on the operation panel is flickering.) Check the frequency command source and
enter a frequency command.
5-273
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.
5-406
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.
2-44