Contactor Welding Detected; No Spec: Safety Observation; Sdio Connector Input Volt Err - Mitsubishi Electric M800 Series Manual

M800/M80/E80/C80 Series Alarm/Parameter Manual
4 MCP Alarms (Y)
Y20

Contactor welding detected

[M8]
Details
Contactor welding was detected.
Displays the bit corresponding to the No. of the abnormal contactor for the contactor information.
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.
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.
[C80]
Details
Contactor welding was detected.
The alarm indicates the parameter to which the weld detection device of the error contactor is assigned with
the bit.
bit0: #1330 MC_dp1
bit1: #1331 MC_dp2
bit2: #1339 MC_dp3
bit3: #1340 MC_dp4
Remedy
Make sure that the contactor's auxiliary b contact signal is output correctly to the contactor weld detection
device.
If welding, replace the contactor.
Check the setting of the contactor weld detection device parameter.
Y20

No spec: Safety observation

Details
"#2313 SV113 SSF8/bitF (ssc SLS (Safely Limited Speed) function)" and "#13229 SP229 SFNC9/bitF (ssc
SLS (Safely Limited Speed) function)" are set for a system with no safety observation option.
Remedy
Disable "#2313 SV113 SSF8/bitF (ssc SLS (Safely Limited Speed) function)" and "#13229 SP229 SFNC9/bitF
(ssc SLS (Safely Limited Speed) function)".
Then, restart the NC.
Y20

SDIO connector input volt err

Details
24VDC power is not supplied to SDIO connector correctly. (SDIO 4A pin supply voltage was dropped to 16V
or less, or 1ms or more instant power interrupt was detected.)
In this case, "Pw sply:Inst pw interpt(DC24V)" alarm occurs because the contactor control output signal cannot
be controlled.
This state remains until restarting the NC even if the cause of the alarm has been removed.
Remedy
Check the wiring. Supply 24VDC power to the SDIO connector.
Restart the NC.
IB-1501279-H
0008
0009
0010
74
Contactor info