Check First When You Have A Trouble - Mitsubishi Electric FR-A820-00046 Instruction Manual

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Check first when you have a trouble

6.6
Check first when you have a trouble
For Real sensorless vector control and vector control, also refer to the troubleshooting on page 5-107
(speed control), page 5-146 (torque control), and page 5-183 (position control).
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.
6.6.1
Motor does not start
Check
points
Main
Circuit
Input
signal
6 - 36
Possible cause
Appropriate power supply voltage is not
applied.
(Operation panel display is not provided.)
Motor is not connected properly.
The jumper across P/+ to P1 is disconnected.
A DC reactor (FR-HEL) is not connected.
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.)
Output stop signal (MRS) or reset signal (RES) is
ON. (FWD or REV LED on the operation panel is
flickering.)
Countermeasure
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.
Connect the DC reactor securely when required
according to the capacity.
Check the start command source, and input a
start signal.
PU operation mode: FWD key/REV key
External operation mode: STF/STR signal
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.
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.
Protective functions
Refer to
page
2-48
2-26
2-26,
2-91
5-265
2-36
5-265
5-389
2-36

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