No. LED display Description Countermeasure
308
A soft phase alarm (SPHAL) was detected. Turn the power off. This alarm may be caused
by noise.
319
When the absolute pulse coder is used, the
motor has not yet rotated through more than
one turn after the first power-up.
Rotate the motor through more than one turn
in jog feed mode, then turn the power off then
back on.
350
The battery voltage of the absolute pulse
coder is low.
Replace the battery.
Restart the operation from reference position
return.
351
The battery voltage of the absolute pulse
coder is low. (warning)
Replace the battery.
401
A communication error was detected in the
serial pulse coder.
Check the connection of the pulse coder signal
cable. If the cable is normal, the pulse coder
or servo amplifier unit may be defective. This
error can also be caused by external noise.
S
ervo alarms
No. LED display Description Countermeasure
400
The servo motor has overheated (estimated
value).
The motor operation condition may be too
severe. Check the operation condition.
SVU-12
SVU-20
The cooling fins have overheated.
(hardware detection)
The load on the motor may be too high.
Re-examine the load conditions.
403
SVU-40
SVU-80
This alarm will not be issued.
The regenerative discharge unit has
overheated.
This alarm is issued when the average
regenerative discharge energy is too high
(when the acceleration/deceleration frequency
is too high, for example).
404
(1) When the separate regenerative discharge resistor is not used: For the SVU-12 and the
SVU-20, check whether the CX11-6 connector is short-circuited with a dummy connector;
for the SVU-40 and the SVU-80, check whether the CX20 and CX23 connectors are
short-circuited with a dummy connector.
(2) The average regenerative discharge energy may be too high. Decrease the
acceleration/deceleration frequency.
(3) The separate regenerative discharge unit may not be connected properly. Check the
connection.
(4) The thermostat of the separate regenerative discharge unit may be defective. Disconnect
the separate regenerative discharge unit, then check the thermostat. If the thermostat is
open even through the separate regenerative discharge unit is cool, replace the separate
regenerative discharge unit.
(5) The resistor of the separate regenerative discharge unit may be defective. Disconnect the
separate regenerative discharge unit, then check the resistance. If it does not fall in the
range of the predetermined resistance ±20%, replace the separate regenerative discharge
unit.
(6) If (1) to (5) are not the cause of the alarm, replace the servo amplifier unit.
Reference position return could not be
executed correctly.
Re-execute reference position return.
405
If a value in the range of 4 to 96 is set for parameter No. 032 (CMR), an alarm may be issued.
In this case, prevent an alarm from being issued by setting N405 (bit 4 of parameter No. 001) to
“1”.
EDIT
DATE DISIGNE
DESCRIPTION
TITLE
DRAW
ALARM FOR FANUC SERVO MOTOR β series I/O Link
Option (FANUC Series 21i/210i/210is–MA
OPERATOR’S MANUAL), (FANUC Series
21i/210i–MB OPERATOR’S MANUAL)
B-63094EN/02-5, B-63614EN/01-2
SHEET
4/8
APPROV.
FANUC LTD