Mitsubishi Electric E70 Series Instruction Manual page 622

Y20 Safety observation: parameter memory error 0031 (Alarm No.))
Details
The following parameter and the data for checking the parameter are inconsistent.
Alarm No.: Parameter No. with the check error is displayed.
Remedy
- Correct the parameter setting.
- Restore the backup data, as the parameter or check
data may be corrupted.
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.
Y51 Parameter G0tL illegal 0001
Details
The time constant has not been set or exceeded the setting range.
Remedy
Correct "#2004 G0tL (G0 time constant (linear))".
Y51 Parameter G1tL illegal 0002
Details
The time constant has not been set or exceeded the setting range.
Remedy
Correct "#2007 G1tL (G1 time constant (linear))".
Y51 Parameter G0t1 illegal 0003
Details
The time constant has not been set or exceeded the setting range.
Remedy
Correct "#2005 G0t1 (G0 time constant (primary delay) / Second-step time constant for soft
acceleration/deceleration)".
Y51 Parameter G1t1 illegal 0004
Details
The time constant has not been set or exceeded the setting range.
Remedy
Correct "#2008 G1t1 (G1 time constant (primary delay)/Second-step time constant for soft
acceleration/deceleration)".
Y51 Parameter grid space illegal 0009
Details
The grid space is illegal.
Remedy
Correct "#2029 grspc(Grid interval)".
Y51 Parameter stapt1-4 illegal 0012
Details
The time constant has not been set or exceeded the setting range.
Remedy
Correct the parameters from "#3017 stapt1(Tap time constant (Gear: 00))" to "#3020 stapt4(Tap time
constant (Gear: 11))".
E70 Series Instruction Manual
Appendix 6.4 MCP Alarms (Y)
IV - 89