18
3
WIRING
3.1 Connection to network
(1) Be sure to check the following before connecting the inverter to the network.
• Check that the FR-A8ND is securely inserted into the inverter. (Refer to
• Check that the correct node address is set. (Refer to
.)
• Check that a drop cable is firmly connected to the FR-A8ND. (Refer to
(2) Make sure that the terminating resistor is installed at each end (between C+ and C-) of the trunk cable. These resistors
must meet the following requirements.
(3) Connect drop cables to the trank cable.
• If the trunk connector is a DeviceNet
sanctioned pluggable or sealed
connector, the connection to the active
network can be made at any time
whether the inverter is ON or OFF. The
option unit automatically detects when
the connection is completed.
• If connecting to the network with free
wires, power to the network and inverter
should be shut off as a safety
precaution in case two or more signal
wires are accidentally shorted together.
Requirements of terminating resistors
R (resistance value) = 121
1% metal film
0.25 W
Inverter
Trunk cable
Trunk connector
Drop cable
Terminating
resistor
Inverter