Appendix 2.5.2 Safety Observation Warnings - Mitsubishi Electric C70 Setup Manual

Appendix 2.5.2 Safety Observation Warnings

(Note 1) "Y21" warnings are displayed as "Y21 Safety observation warning" with an error number. Error numbers are the
four digit numbers displayed displayed after error names (start from 0001). "Y21" warnings are listed in
ascending order in this manual.
(Note 2) When parameter "#1225/bit5" is set to "1", "Y21 safety observation warning 0001" will not be recorded in the
alarm history.
Y21 Speed obsv signal: Speed over 0001 (Axis name)
Details
The speed exceeds the safety speed limit when the "speed monitor mode" signal is ON.
The name of the axis with an error is displayed.
Remedy
Decelerate the speed to reset the warning and start the speed monitor.
Y21 Dual signal: State after error unconfirmed 0020 (Device No.)
Details
- A dual-signal comparison error was detected.
Signal outputs from both PLC and CNC CPUs have not been confirmed since the power was turned
ON again.
The No. of device from which the signal output has not been confirmed is displayed.
When several signals have not been confirmed, the smallest device No. will be displayed.
Remedy
- Remove the cause of the dual-signal comparison error, turn the controller OFF and ON, then turn the
signal ON and OFF in the dual-signal comparison state.
- The dual signals with the error can be reset and canceled if not used.
Y21 Safety obsv warning 0040 (sub-number)
Details
The brake test cannot be started because the condition to start the brake test is not met.
[Sub-number](factor of errors)
0001: In automatic operation
0002: Not in-position
0003: During servo OFF
0004: In current limit
0005: In synchronization control
0006: Brake test parameter error
0007: Zero point initialization incomplete
0008: In PLC axis control of NC/PLC axis switch
0009: Drive unit is not mounted
* If there are several factors, the sub-number will be shown from the smallest.
Remedy
Check the conditions for starting the brake test.
Remove the factor of the warning and reclose the brake test signal, the brake test will be restarted and
this warning will be released.
* The brake test will not be started with the brake test start signal ON, even if the cause of the warning
is removed.
Y21 Safety obsv warning 0041 (Axis name)
Details
The change amount of the motor feedback position exceeded the tolerable value during the brake test
1, and the brake test was not properly completed.
Remedy
Turn OFF the power to remedy the brake with an error, then restart restart the brake test.
This warning will be released when the brake test is properly completed.
This warning can also be released by pressing the reset button with having the X device designated by
the parameter "#1368 SscAlmRstDev" ON.
C70 Setup Manual
Appendix 2.5 Safety Observation Alarms (Y)
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