Omron OMNUC G User Manual page 397

Alarm
Alarm Name
code
Absolute encoder
status error
47
ABS
48 Encoder phase Z error
Encoder PS signal
49
error
Node address setting
82
error
83 Communications error
Transmission cycle
84
error
86 Watchdog data error
Cause
The encoder's detection values were
higher than the specified value at
power-ON.
A phase-Z pulse of the 2500 p/r 5-line
serial encoder was not detected
regularly.
The encoder has failed.
Logic error was detected in the PS
signal (magnetic pole) of the 2500 p/r
5-line serial encoder.
The encoder has failed.
The rotary switch for setting the node
address of the Servo Drive was set out
of range. (Value is read at power-ON)
Data received during each
MECHATROLINK-II communications
cycle repeatedly failed, exceeding the
number of times set by the Communi-
cations Control (Pn005).
While actuating MECHATROLINK-II
communications, synchronization
frames (SYNC) were
not received according to the transmis-
sion cycle.
The synchronization frames
themselves were faulty.
The transmission cycle of the
synchronization frames was not as
specified. (Includes dropped frames).
Synchronization data exchanged
between the master and slave nodes
during each MECHATROLINK-II com-
munications cycle resulted in an error.
8-3 Troubleshooting
Countermeasure
Do not rotate the Servomotor when the
power is turned ON.
Replace the Servomotor.
Check for malfunction due to noise.
Also take EMC measures.
Replace the Servomotor.
Check the value of the rotary switch for
setting the node address.
Set the rotary switch correctly (set to 1
to 31), and then turn OFF the control
power supply for the Servo Drive and
turn it ON again.
Check that commands are being sent
from the master node to the slave
node.
Check the MECHATROLINK-II
communications cable for disconnec-
tion or wiring problem.
Check the connection of the terminator
(termination resistor).
Check the MECHATROLINK-II
communications cable for excessive
noise, and that the cable is laid proper-
ly. Also check the FG wiring for the Ser-
vo Drive.
Increase the consecutive communica-
tions error detection count in the Com-
munications Control (Pn005).
Check the transmission cycle of the
synchronization frames sent from the
master node, and ensure that it does
not fluctuate and is as specified.
Check the communications cable for
disconnection or wiring problem.
Check for excessive noise on the
communications cable.
Check the connection of the
terminator (termination resistor).
Check the laying of the
communications cable and the FG
wiring.
Check the update process for the
watchdog data (MN) on the master
node.
8
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