
B-65395EN/01 TROUBLESHOOTING 2.ALARM NUMBERS AND BRIEF DESCRIPTIONS
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System alarms
No. LED display Description Countermeasure
−
An error was detected in the RAM
write/read test at power-up. (External
SRAM)
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A watchdog alarm 1 was issued. Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A watchdog alarm 2 was issued. Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A watchdog alarm 3 was issued. Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
The logic supply was less than 5V. Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
The low voltage of the 24-VDC
control supply was detected.
Check the 24-VDC control supply
voltage. If the voltage is low, increase
the voltage to an appropriate level.
−
An error was detected in the data
collation check for the nonvolatile
memory.
Turn the power off then back on.
Then, re-enter the parameters. If this
alarm recurs, replace the servo
amplifier module.
−
A data transfer alarm for the
nonvolatile memory has been issued.
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A CRC check alarm for the FROM
that is built into the CPU is issued.
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A alarm for the servo amplifier
module is issued. (Synchronous
deviation alarm)
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A alarm for the servo amplifier
module is issued. (Dead-band 0
alarm)
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
A alarm for the servo amplifier
module is issued. (Timer for skip
position measurement)
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.
−
Loading of a software on the FROM
that is built into the CPU is
incomplete.
An error was detected in the RAM
write/read test at power-up. (Internal
RAM)
An error was detected in the control
circuit.
Turn the power off then back on. If this
alarm recurs, replace the servo
amplifier module.