Check First When You Have Troubles; Motor Does Not Start - Mitsubishi Electric FR-E700 Series Instruction Manual

Check first when you have troubles

7.6 Check first when you have troubles
7.6.1

Motor does not start

Check Points
Main circuit
Input signal
7 - 22
Possible Cause
Appropriate power supply voltage is not
applied.
(Operation panel display is not provided.)
Motor is not connected properly.
The jumper across P/+ and P1 is discon-
nected.
Start signal is not input.
Both the forward and reverse rotation start
signals (STF, STR) are input simultaneously.
Frequency command is zero.
(RUN LED of the operation panel flickers.)
AU signal is not ON when terminal 4 is used
for frequency setting.
(RUN LED of the operation panel flickers.)
Output stop signal (MRS) or reset signal (RES)
is ON.
(RUN LED on the operation panel flickers
while MRS signal is ON.)
Jumper connector of sink - source is wrongly
selected.
(RUN LED of the operation panel flickers.)
Shorting wires between S1 and PC, S2 and PC
are disconnected.
Voltage/current input switch is not correctly
set for analog input signal (0 to 5V/0 to 10V, 4
to 20mA).
(RUN LED of the operation panel flickers.)
The STOP/RESET key was pressed
(Operation panel indication is "PS".)
Two-wire or three-wire type connection is
wrong.
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.
Check the wiring between the inverter and
the motor.
Securely fit a jumper across P/+ and P1.
When using a DC reactor (FFR-HEL-(H)-E),
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: RUN 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, 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.
Check that the control logic switchover
jumper connector is correctly installed.
If it is not installed correctly, input signal is
not recognized.
Short between S1 and PC, S2 and PC with
shorting wires.
Set Pr. 73, Pr. 267, and a voltage/current
input switch correctly, then input an analog
signal in accordance with the setting.
During the External operation mode, check
the method of restarting from a STOP/RESET
key input stop from PU.
Check the connection.
Connect STOP signal when three-wire type is
used.
Troubleshooting
Refer to
Page
—
3-6
3-42
6-207
3-14
6-207
3-14
6-117,
7-18
3-26
3-23
3-14
7-7
6-120