Appendix 2.5 Safety Observation Alarms (Y); Appendix 2.5.1 Safety Observation Alarms - Mitsubishi Electric C70 Setup Manual

MITSUBISHI CNC
Appendix 2 Explanation of Alarms

Appendix 2.5 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.

Appendix 2.5.1 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 cycle, 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.
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