
8. ALARM LIST
499
No. ContentsMessage
417 SERVO ALARM: n–TH AXIS
– PARAMETER
INCORRECT
This alarm is issued when an invalid pa-
rameter related to the servo system is de-
tected on axis n (axes 1 to 8).
(Digital servo system alarm)
When DGN203#4 = 1, an invalid parameter
has been detected by the servo software.
Analyze the cause with DGN352.
When DGN203#4 = 0, an invalid parameter
has been detected by the CNC software.
The possible causes are indicated below.
(See DGN280.)
1) The value set in PRM2020 (motor form)
is out of the specified limit.
2) A proper value (111 or –111) is not set
in PRM2022 (motor revolution direc-
tion).
3) Illegal data (a value below 0, etc.) was
set in PRM2023 (number of speed
feedback pulses per motor revolution).
4) Illegal data (a value below 0, etc.) was
set in PRM2024 (number of position
feedback pulses per motor revolution).
5) PRM2084 and 2085 (flexible field gear
rate) have not been set.
6) A value outside the limit of {1 to the
number of control axes} or a non–con-
tinuous value (PRM1023 (servo axis
number) contains a value out of the
range from 1 to the number of axes, or
an isolated value was set in PRM1023
(servo axisnumber).
7) A torque control parameter is set incor-
rectly in PMC axis control. (The torque
constant PRM2105 is set to 0.)
420 SERVO ALARM: n AXIS
SYNC TORQUE
(M series)
During simple synchronous control, the dif-
ference between the torque commands for
the master and slave axes exceeded the
value set in PRM2031.
421 SERVO ALARM: n AXIS
EXCESS ER (D)
The difference between the errors in the
semi–closed loop and closed loop has be-
come excessive during dual position feed-
back. Check the values of the dual position
conversion coefficients in PRM2078 and
2079.
422 SERVO ALARM: n AXIS In torque control of PMC axis control, a
specified allowable speed has been ex-
ceeded.
423 SERVO ALARM: n AXIS In torque control of PMC axis control, the
parameter–set (PRM1885) allowable cu-
mulative travel distance has been exceed-
ed.
430 n AXIS : SV. MOTOR
OVERHEAT
A servo motor overheat occurred.
431 n AXIS : CNV. OVERLOAD 1) PSM: Overheat occurred.
2) β series SVU: Overheat occurred.
432 n AXIS : CNV. LOW VOLT
CONTROL
1) PSM: Control power voltage has
dropped.
2) PSMR: The control power supply volt-
age has dropped.
3) β series SVU: The control power sup-
ply voltage has dropped.