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Appendix 7. Explanation of Alarms
Appendix 7.4 MCP Alarms (Y)
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
sequence program may not be correct.
Remedy
Correct the sequence program.
Restart the NC.
Y20 Speed obsv: Para incompatible 0007 (Axis name)
Details
Two speed monitoring parameters are not matched at the rising edge of the "speed monitor
mode" signal.
The name of the axis with an error is displayed.
Remedy
Correct the relevant parameters so that the two speed monitoring parameters match.
Restart the NC.
Y20 Contactor welding detected 0008 Contactor No.
Details
Contactor welding was detected.
Some contactors take a while to be shutdown after the servo ready is turned OFF, and the
servo ready was turned ON in the meantime.
The contactor showing unusual move will be indicated as a bit.
bit0 : MC_dp1
bit1 : MC_dp2
Remedy
- Make sure that contactor's auxiliary B contact signal is output correctly to the device set on
"#1330 MC_dp1(Contactor weld detection device 1)" and "#1331 MC_dp2(Contactor weld
detection device 2)".
- If welding, replace the contactor.
- Restart the NC.
Y20 No spec: Safety observation 0009
Details
“#2313 SV113 SSF8/bitF (Servo function selection 8)”, “#13229 SP229 SFNC9/bitF (Spindle
function 9)” and “#21125 SSU_num (Number of dual signal modules)” are set for a system
with no safety observation option.
Remedy
Disable “#2313 SV113 SSF8/bitF (Servo function selection 8)” and “#13229 SP229 SFNC9/
bitF (Spindle function 9)”.
Set “#21125 SSU_num (Number of dual signal modules)” to "0". Restart the NC.
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