Specifications

I Alarms
Safety Observation Alarms (Y)
I - 33
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.
Y20 Safety OBS ERR 0012 (Contactor data)
Details
Contactor's operation is not following the NC's commands.
The contactor showing unusual move will be indicated as a bit.
bit0 : MC_dp1
bit1 : MC_dp2
(Example 1) Operation error only in MC_dp1 : 0001
(Example 2) Operation error in both MC_dp1 and MC_dp2 : 0003
Remedy
- Check if the contactor's auxiliary b contact signal is correctly output to the device set in
"#1330 MC_dp1" and "#1331 MC_dp2".
- Check the wiring for contactor shutoff.
- Check for contactor's welding.
- Turn the controller ON again.
Y20 STO function operation illegal 0013
Details
The drive unit's STO function has failed to work properly.
Remedy
If this alarm has occurred alone, a drive unit failure can be suspected.
If other alarms have been generated at the same time, it is also possible that there is commu-
nication problem. Check the optical cable wiring.
Y20 STO function illegal at pwr ON 0014
Details
The motor power has not been shut down with the STO function when the NC power was
turned ON.
Remedy
If this alarm has occurred alone, a drive unit failure can be suspected.
If other alarms have been generated at the same time, it is also possible that there is commu-
nication problem. Check the optical cable wiring.
Y20 commanded position error 0015
Details
The stop state of commanded position was released state during the stop monitoring.
Remedy
Check the stop monitoring parameter and user sequence.
Turn the power of controller ON again.
Y20 FB pos error 0016
Details
The stop state of feedback position was released during the stop monitoring.
Remedy
Check the stop monitoring parameter and user sequence.
Turn the power of controller ON again.
Y20 Dual signal: compare error 0020 (Device No.)
Details
The dual signals are not matched between PLC CPU and CNC CPU.
The following factors may cause the error.
- Cable is disconnected.
- Sensor is broken.
Alarm No. shows the device No. which has the error. ("0024" indicates the device No. X24.)
When two or more signals are detected for errors, the No. shows the first detected signal.
Remedy
Check the wiring.