IS810N-INT Series Servo System User Manual (Brief)Chapter 7 Troubleshooting
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E1.E21: MAC address not burned
Cause:
The MAC address of the driver is not burnt.
Probable Cause Conrming Method Corrective Action
The MAC address is not 
burned.
The drive does not burn the MAC 
address if the fault persists after 
the servo drive is powered off and 
on several times.
Please consult the 
manufacturer's technical 
service personnel.
7.2.5 Troubleshooting Communication Faults
This part describes how to rectify communication faults.
E1.E08: Synchronization lost
Cause:
The masters synchronization signal is abnormal during communication.
Probable Cause Conrming Method Corrective Action
1. The slave 
station's receipt 
signal is abnormal 
during synchronous 
communication.
Check whether a shielded 
twisted pair cable is used as the 
communication cable.
Check whether the servo drive is 
well grounded.
Check whether drive's Ethernet 
port is damaged.
Use a shielded twisted pair cable.
Connect the cable according to the 
wiring instructions.
Check the network connection 
status via the rst LED on the left.
2. The master's 
sending signal is 
abnormal during 
synchronous 
communication.
The synchronization clock of the 
host controller is not valid.
The synchronization clock error of 
the host controller is too large.
Measure the synchronization cycle 
by background oscilloscope or 
actual oscilloscope:
If the synchronization cycle is 0, it 
indicates that the synchronization 
clock of the host controller is not 
valid. First, check whether the 
network cable connects all slaves 
s in accordance with entering from 
the IN port and going out from the 
OUT port; then restart the network. 
But if the network cable connection 
sequence is correct, restart the 
network directly.
If it is not 0 and within the 
permissible uctuation range (2us) 
of the servo drive, increase the 
permissible interruption loss times 
(200E-21h) of the slave station.
3. When the servo is 
enabled, the network 
switches from OP to 
non-OP.
Check whether the network state 
has switched from OP to non-Op.
Check the host computer network 
status switch program.
E1.E11: ESI conguration le not burned
Cause:
The ESI conguration le is not burned.