PRE-OPERATION INSTRUCTIONS
9
1
1.3 MNS LED (operation status indication)
The MNS LED indicates the operating status of the option unit by its indication status.
Check the position of LED on page 8.
LED
indicator
Description Corrective action
OFF
Inverter power OFF Supply power to the inverter.
Network power OFF Supply power to the network.
Cable disconnected
Check for a DeviceNet cable disconnection, connector contact fault, and misplaced
terminating resistor.
Own node only on the network Supply power to the master.
Different baud rate between the
inverter and master
Set the same baud rate for the inverter (Pr.346) and master.
Green
(flickering)
Connection not established
(Cable connection and network
power are normal.)
Check the node address setting (node address switches and Pr.345) of the inverter.
Set the master to the RUN mode.
Check that the size (number of bytes) of the I/O communication from the master matches
with that set in Pr.346 of the inverter. (For how to check the I/O communication size of the
master, refer to the Instruction Manual of the master device.)
Green (ON)
Connection established
(The inverter power is ON and the
master on the network has
recognized this option unit.
The green LED stays ON during
communication.)
<When the inverter is not running even with the green LED ON>
• Check that the correct data is sent from the master to the I/O communication format
specified in Pr.346. (For how to check the data to be sent from the master, refer to the
Instruction Manual of the master device.)
Check that the inverter is in the NET operation mode or communication is specified as the
communication operation command source or the operation command source of the
inverter.
Red
(flickering)
I/O communication connection
timeout
*1
Check the EPR (Expected Packet Rate) setting
*2
of the I/O communication of the master
again.
(For how to set the EPR, refer to the Instruction Manual of the master device.)
Check for a DeviceNet cable disconnection, connector contact fault, and misplaced
terminating resistor.
Network power OFF
Review the power supply method for the network so that the power does not turn OFF
again.