249
5
TROUBLESHOOTING
Check first when you have a trouble
5.5 Check first when you have a trouble
5.5.1 Motor does not start
POINT
If the cause is still unknown after every check, it is recommended to initialize the parameters (initial value) then
set the required parameter values and check again.
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 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.
Motor is not connected properly. Check the wiring between the drive unit and the motor. 15
The jumper across P/+ to P1 is disconnected.
Securely fit a jumper across P/+ to P1.
To use a DC reactor (FR-HEL) or Filterpack, remove the
jumper across the terminals P/+ and P1, then connect
the DC reactor or Filterpack.
32
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
149
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 the STF and STR signals are turned ON
simultaneously in the initial setting, a stop command is
given.
18
Speed command is zero.
(RUN LED on the operation panel is flickering.)
Check the speed command source and enter a speed
command.
149
AU signal is not ON when terminal 4 is used for speed
setting.
(RUN LED on the operation panel is flickering.)
Turn ON the AU signal.
Turning ON the AU signal activates terminal 4 input.
130
Output stop signal (MRS) or reset signal (RES) is ON.
(RUN LED on the operation panel flickers while MRS
signal is ON.)
Turn MRS or RES signal OFF.
Drive unit starts the operation with a given start
command and a speed command after turning OFF
MRS or RES signal.
Before turning OFF, ensure the safety.
102,
236
Jumper connector of sink - source is wrongly selected.
(RUN 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.
20
Shorting wires between S1 and SC, S2 and SC are
disconnected.
Short between S1 and SC, S2 and SC with shorting
wires.
19
Voltage/current input switch is not correctly set for analog
input signal (0 to 5V/0 to 10V, 4 to 20mA).
(RUN 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.
18
was pressed.
(Operation panel indication is (PS).)
During the External operation mode, check the method
of restarting from a input stop from PU.
240
Two-wire or three-wire type connection is wrong.
Check the connection.
Connect STOP signal when three-wire type is used.
104
