
8
8.3 Alarms Indicated on the Screen of the Power Mate CNC Manag-
er (FANUC Servo Motor Amplifier β Series (I/O Link Option))
538
D Servo alarms
No.
LED
display
Description Countermeasure
400
The servo motor has over-
heated (estimated value).
The motor operation condi-
tion may be too severe.
Check the operation condi-
tion.
403
SVU–12 The cooling fins
have overheated.
SVU–20 (hardware detec-
tion)
The load on the motor may
be too high. Re–examine
the load conditions.
403
SVU–40 This alarm will not
be issued.
SVU–80
The regenerative discharge
unit has overheated.
This alarm is issued when
the average regenerative
discharge energy is too high
(when the acceleration/de-
celeration 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 fre-
quency.
(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 regen-
erative discharge unit, then check the thermostat. If the
thermostat is open even through the separate regen-
erative 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 regenera-
tive 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 cor-
rectly.
Re–execute reference posi-
tion return.
405
If a value in the range of 4 to 96 is set for parameter(*) 032
(CMR), an alarm may be issued. In this case, prevent an
alarm from being issued by setting N405 (parameter(*)
001#4) to “1”.
410
The servo position error in
the stop state is larger than
the value specified in
parameter(*) 110.
Determine the mechanical
cause of the large position
error. If no mechanical
cause is found, specify a
larger value for the parame-
ter(*).