- 67 -
Trouble
No.
Trouble
Possible
cause
How to diagnose the trouble
Solutions
1
LED is OFF
Power fault
Check if the LED (green) of the
controller is lit.
The power supply, voltage or current
should be modified to an appropriate one.
→4. External Wiring Diagram
→5. CN1: Power supply plug
Wiring fault
Is the wiring connected
correctly?
Check if the wiring is connected
correctly or if there is broken wire or
short-circuit by referring to this
Operation Manual. Correct the wiring
and check that the input/output of each
signal is correct.
Separate the power supply for the
CN1controller and the CN5 I/O signal
power supply.
→ 4. External Wiring Diagram
→6.4 Parallel I/O Wiring Example
2
ALM is ON
Alarm
condition
Check if the controller is in the
alarm condition.
Refer to the controller operation manual,
and take appropriate measures. Take
appropriate measures based on the
operation manual.
→ 12. Alarm Detection
3
Communication
fault.(LEC-W2)
USB driver is
not installed
Check that the USB driver for
the communication cable is
installed.
Please install the USB driver of USB
cable.
The USB driver's installation starts when
the communication cable is connected
with PC. Refer to the Installation Manual
for setting kit (LEC-W2) for the
installation procedure.
Incorrect
COM port
setting
Please confirm if the correct
COM port is set to the controller
setting kit.
The COM port allocated to the
communication cable is different for
different PC’s. Please confirm the COM
port number with the communication
cable connected.
The COM port number can be checked
using the Device Manager of the PC.
Refer to the Installation Manual for
controller setting kit (LEC-W2) for the
checking and setting method for COM
port numbers.
Inappropriate
connection
Check the wiring.
Please confirm motor controller =
communications cable = USB cable = PC
is connected.
As example, cannot make the
communication if the connector has been
damaged.
Please confirm the power supply of
motor controller has been turned on. The
communication is not made if the Power
supply is off.
If the equipments (PLC and
measurement hardware) except motor
controller is connected with PC. (There is
a possibility that the communication with
other equipment interferes in PC.)
