R
T
S
U
V
W
+
-
2W 220 kW
VDC
Output voltage
measurement method
Motor
Moving coil type
300 V (200-V class)
600 V (400-V class)
Effective value of fundamental wave VAC
VAC=1.1×VDC
Diode
600 V 0.1 A min. (200-V class)
1000 V 0.1 A min. (400-V class)
Inverter
10-1-8
Method for Ring Disconnection Maintenance and Inspection
This section takes the following example of a configuration in which the ring is disconnected between
Inverter A and Inverter B, and describes how to perform inspection and how to replace the faulty inver-
ter.
IN
X2
X3
Inverter A
Power supply unit
NJ/NX-series CPU Unit
EtherCA
T
Junction Slave
Inverter B Inverter C
1 Identify where the ring is disconnected.
• With a tool such as support software, find the node address of the inverter breaking the ring.
For the NJ/NX-series Controller
, check the _EC_RingBreakNodeAdr system-defined variable
that will provide you with the node address of "Inverter A". Check that the L/A OUT indicator
of "Inverter A" and the L/A IN indicator of "Inverter B" are OFF.
2 Reconnect the EtherCAT communications cable between "Inverter A" and "Inverter B".
• Stop operation and turn OFF the power supply to the EtherCA
T master and to the slaves.
• After the 7-segment LED displays of Inverter A and Inverter B turn OFF, reconnect the Ether-
CAT communications cable, and then turn ON the power supply to "Inverter A" and "Inverter
B".
• If the L/A OUT indicator of "Inverter A" and the L/A IN indicator of "Inverter B" are ON, the
ring disconnection status has been fixed.
10 Maintenance and Inspection
10-9
M1 Series EtherCAT Type User’s Manual (I670)
10-1 Maintenance and Inspec-
tion
10
10-1-8 Method for Ring Disconnection Maintenance and Inspection
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