
B--65245EN/02
2. ALARM DISPLAY AND
CORRESPONDING
COUNTERMEASURES
TROUBLESHOOTING AND
COUNTERMEASURES
143
No. CountermeasureDescriptionLED display
510
The positive soft stroke limit has been
exceeded.
Check whether appropriate values have been
specified for parameters No.142 and 143.
511
The negative soft stroke limit has been
exceeded.
ec
w
e
er a va
move c o mman
s spec
-
fied. Move the tool inthe opposite direction injog
mode, then perform a reset.
System alarms
No. LED display Description Countermeasure
--
An erro r was detected in the RAM write/readtest
at power--up.
Replace the servo amplifier unit.
--
An error was detected in the data c ollation
check for the battery--powered memory.
Turn the power off then back on. Then, re--enter
the parameters. If this alarm recurs, replace the
servo amplifier unit.
--
A data transfer alarm for the battery --powered
memory has been issued.
Replace the servo amplifier unit.
--
A watchdog alarm was issued. Turn the power off then back on. If this alarm
recurs, replace the servo amplifier unit.
--
A checksum alarm for the control software ROM
is issued.
Replace the servo amplifier unit.
--
A checksum alarm for the ROM that is built into
the CPU is issued.
Replace the servo amplifier unit.
--
An error was detected in the control circuit. Replace the servo amplifier unit.
I/O link alarm
No. LED display Description Countermeasure
--
A FANUC I/O Link error occurred.A servo ampli-
fier unit connected to the line was turned off.
Turn off the power to all units connected to the
line. Then, turn on the slave devices, followed
by the master device.
No LED display
No. LED display Description Countermeasure
--
No indicators lit
The control circuit is not operating normally. (1) Check the 24--VDC control supply voltage.
If the voltage is low, increase the voltage to
an appropriate level.
(2) Check whether a fuse in the servo amplifier
unit has blown. If a blown fuse is found,
replace it, following the proceduredescribed
in Part 4 “Maintenance of Servo Amplifier
Unit.”
If (1) and (2) are not the cause, replace the servo
amplifier.