Specifications

I Alarms
Safety Observation Alarms (Y)
I - 32
5. Safety Observation Alarms (Y)
Axis names are expressed with a letter in the following manner:
- NC axis: axis name defined by the parameter
- Spindle: "S" = the 1st spindle, "T" = the 2nd spindle, "M" = the 3rd spindle, "N" = the 4th spindle, "P" = the
5th spindle, "Q" = the 6th spindle, "R" = the 7th spindle
- PLC axis: "1" = the 1st PLC axis, "2" = the 2nd PLC axis, "3" = the 3rd PLC axis, and so on.
5.1 Safety Observation Alarms
(Note 1) "Y20" alarms are displayed as "Y20 Safety observation alarm" with an error number. Error numbers
are the four digit numbers displayed after the error names (start from 0001). "Y20" alarms are listed in
ascending order in this manual.
"(Note 2) When more than one safety observation alarms (Y20) are occurring, the alarm detected the earliest
is displayed. When more than one safety observation alarms are detected in the same observation cy-
cle, alarm display follows the below priority order:
0046, 0047, 0036, 0027, 0028, 0029, 0024, 0025, 0022, 0023, 0021, 0030, 0031, 0032, 0033, 0034,
0035, 0037, 0048, 0049, 0050, 0051, 0020, 0026, 0008, 0014, 0009, 0001, 0007, 0002, 0005, 0006,
0004, 0003, 0016, 0015, 0012, 0013"
"(Note 3) Although releasing most PR alarms requires rebooting the NC, some safety observation alarms
(PR) (Note 4) can be released by pressing the reset button with having the X device designated by the
parameter ""#1368(PR) SfAlmRstD"" ON.
However, merely implementing the reset procedure, without having the cause of the alarm occurrence
being removed, wouldn't release safety observation alarms."
(Note 4) Alarms 0002, 0004, 0005, 0006, 0015, and 0016 can be released by pressing the reset button. Upon
completion of releasing a safety observation alarm by pressing the reset button, the alarm of the highest
priority of the remaining will be displayed.
Y20 Parameter compare error 0001 (Axis name)
Details
The speed monitoring parameter in the NC does not correspond to the parameter transmitted
to the drive unit.
The name of the axis with an error is displayed.
Remedy
The NC or the servo drive unit may be damaged.
Contact the service center.
Y20 Sfty obsrvation: Cmd spd err 0002 (Axis name)
Details
The speed exceeding the speed set with the parameter was commanded during the speed
monitoring mode.
The name of the axis with an error is displayed.
Remedy
Check the speed monitoring parameter and the sequence program.
Restart the NC.
Y20 Sfty obsrvation: FB pos err 0003 (Axis name)
Details
The commanded position, transmitted to the servo drive unit from NC, is totally different from
the feedback position received from the servo drive unit during the speed monitoring mode.
The name of the axis with an error is displayed.
Remedy
The NC or the servo drive unit may be damaged.
Contact the service center.
Y20 Sfty obsrvation: FB speed err 0004 (Axis name)
Details
Actual rotation speed of the motor is exceeding the speed that has been set with speed mon-
itoring parameter during the speed monitoring mode.
The name of the axis with an error is displayed.
Remedy
Correct the speed observation parameter and the sequence program.
Restart the NC.
Y20 Door signal: Input mismatch 0005 Door No.
Details
Door state signals on the NC side and the drive side do not match. It may be caused by the
followings:
- Cable disconnection
- Damaged door switch
- Damaged NC or servo drive unit
Remedy
Check the cable.
Check the door switch.
Restart the NC.
Y20 No speed observation mode in door open 0006 Door No.
Details
The door open state was detected when the speed monitoring mode was invalid.
The causes may be same as the ones for 0005 (Door signal: Input mismatch). Also the se-
quence program may not be correct.
Remedy
Correct the sequence program.
Restart the NC.