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MELSEC-Q
15 TROUBLESHOOTING
Classification
of errors
Error
code
Error name Error Operation status at error occurrence
900
Outside unit setting
range
The set range of the basic parameter
1 "Unit setting" is outside the setting
range.
901
Outside pulse
number per rotation
range
The set range of the basic parameter
1 "No. of pulses per rotation" is
outside the setting range.
902
Outside movement
amount per rotation
range
The set range of the basic parameter
1 "Movement amount per rotation" is
outside the setting range.
903
Outside unit
magnification range
The set range of the basic parameter
1 "Unit magnification" is outside the
setting range.
904
Pulse output mode
error
The set range of the basic parameter
1 "Pulse output mode" is outside the
setting range.
905
Rotation direction
setting error
The set range of the basic parameter
1 "Rotation direction setting" is
outside the setting range.
906
Outside bias speed
range
• The set range of the basic
parameter 1 "Bias speed at start" is
outside the setting range.
• The bias speed exceeds the speed
limit.
The QD75 READY signal (X0) is not
turned ON.
910
Outside speed limit
value range
• The set range of the basic
parameter 2 "Speed limit value" is
outside the setting range.
• The value obtained by the
conversion of the speed limit value
with respect to the frequency
exceeds the maximum output
frequency of the unit.
• The speed limit value is smaller
than the OPR speed.
911
Outside acceleration
time 0 range
The set range of the basic parameter
2 "Acceleration time 0" is outside the
setting range.
912
Outside deceleration
time 0 range
The set range of the basic parameter
2 "Deceleration time 0" is outside the
setting range.
When the power is turned ON or PLC
READY signal (Y0) is turned from
OFF to ON:
QD75 READY signal (X0) is
not turned ON.
At start: The system will not operate.
920
Backlash
compensation
amount error
The value converted into pulse
number using the movement amount
per pulse is 256 pulses or more.
Parameter
921
Software stroke limit
upper limit
• In the unit of degree, the set value
of the detailed parameter 1
"Software stroke limit upper limit
value" is outside the setting range.
• In a unit other than degree, the
software stroke limit upper limit
value is smaller than the software
stroke limit lower limit value.
The QD75 READY signal (X0) is not
turned ON.