
APPENDIXA. ALARM LIST
B–63445EN/01
186
4) Servo alarms
Number Message Contents
400 SERVO ALARM: n–th AXIS
OVERLOAD
The n–th axis (axis 1–2) overload signal is on. Refer to diagnosis
display No. 201 for details.
401 SERVO ALARM: n–th AXIS VRDY
OFF
1) The n–th (axis 1 or 2) servo amplifier ready signal (DRDY) went
off. Check the servo amplifier.
2) This alarm may occur if a servo amplifier is shared by several NC
units. Set NOFVY (bit 2 of parameter No. 1803).
404 SERVO ALARM: n–th AXIS VRDY
ON
Even though the n–th axis (axis 1–2) READY signal (*MCON) went off,
the servo amplifier READY signal (*DRDY) is still on. Or, when the pow-
er was turned on, *DRDY went on even though *MCON was off.
405 SERVO ALARM: (ZERO POINT
RETURN FAULT)
Position control system fault. Due to an NC or servo system fault in
the reference position return, there is the possibility that reference
position return could not be executed correctly. Try again from the
manual reference position return.
409 SERVO ALARM: n–th AXIS
TORQUE ALM
An abnormal servo motor load was detected, or an abnormal spindle
motor load was detected during rigid tapping.
410 SERVO ALARM: n–th AXIS –
EXCESS ERROR
The position deviation value when the n–th axis (axis 1–2) stops is
larger than the set value.
Note) Limit value must be set to parameter No.1829 for each axis.
411 SERVO ALARM: n–th AXIS –
EXCESS ERROR
The position deviation value when the n–th axis (axis 1–2) moves is
larger than the set value.
Note) Limit value must be set to parameter No.1828 for each axis.
413 SERVO ALARM: n–th AXIS –
LSI OVERFLOW
The contents of the error register for the n–th axis (axis 1–2) and be-
yond the range of –2
31
to 2
31
. This error usually occurs as the result
of an improperly set parameters.
414 SERVO ALARM: n–th AXIS –
DETECTION RELATED ERROR
N–th axis (axis 1–2) digital servo system fault. Refer to diagnosis
display No. 200 and No.204 for details.
415 SERVO ALARM: n–th AXIS –
EXCESS SHIFT
A speed higher than 511875 units/s was attempted to be set in the
n–th axis (axis 1–2). This error occurs as the result of improperly set
CMR.
416 SERVO ALARM: n–th AXIS –
DISCONNECTION
Position detection system fault in the n–th axis (axis 1–2) pulse coder
(disconnection alarm). Refer to diagnosis display No. 201 for details.
417 SERVO ALARM: n–th AXIS –
PARAMETER INCORRECT
This alarm occurs when the n–th axis (axis 1–2) is in one of the
conditions listed below. (Digital servo system alarm)
1) The value set in Parameter No. 2020 (motor form) is out of the
specified limit.
2) A proper value (111 or –111) is not set in parameter No.2022
(motor revolution direction).
3) Illegal data (a value below 0, etc.) was set in parameter No. 2023
(number of speed feedback pulses per motor revolution).
4) Illegal data (a value below 0, etc.) was set in parameter No. 2024
(number of position feedback pulses per motor revolution).
5) Parameters No. 2084 and No. 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–continuous value (Parameter 1023 (servo axis number)
contains a value out of the range from 1 to the number of axes,
or an isolated value (for example, 3 not prceded by 2).was set in
parameter No. 1023 (servo axisnumber).
421 SERVO ALARM: n–th AXIS
EXCESS ER (D)
The difference between the semi–closed side error and the fully
closed side error became large when the dual position feedback
function was being used. Check the setting of the dual position con-
version factor (parameter Nos. 2078 and 2079).