Yaskawa DR2 Sigma Servo - Manual (Page 487)

LIST OF ALARM DISPLAYS
478
Alarm Display
Alarm Display
Di i l
7- Alarm Output Alarm Name Meaning Remarks p y
on Digital
Operator
segment
LED
Alarm Code Output ALM
O
g
Operator LED
ALO1 AL02 AL03
Output
OFF OFF OFF OFF Absolute data
error
Absolute data fails to be
received, or received
absolute data is
abnormal.
For
absolute
encoder
only
OFF OFF OFF OFF User constant
breakdown
Checksum results of
user constants are
abnormal.
OFF OFF OFF OFF User constant
setting error
The user constant
setting is outside the
allowable setting range.
ON OFF OFF OFF Overcurrent An overcurrent flowed
through the power
transistor.
OFF ON OFF OFF Blown fuse Fuse is blown.
ON ON OFF OFF Regenerative
error
Defective regenerative
resistor
Regenerative resistor
disconnection
ON ON OFF OFF Position error
pulse overflow
Position error pulse has
exceeded the value set
in user constant Cn-1E
(overflow).
For
position
control
only
OFF OFF ON OFF Overvoltage or
undervoltage
The main circuit voltage
for motor operation has
become too high or too
low.
ON OFF ON OFF Overspeed Motor speed has
exceeded 4950 r/min.
ON ON ON OFF Overload Rated torque was
exceeded during
continuous operation.
OFF OFF OFF OFF Absolute
encoder error
The number of pulses
per absolute encoder
revolution is abnormal.
For
absolute
encoder
only
OFF: Output transistor is OFF
ON : Output transistor is ON
TERMS
Checksum
An automatic check function for a set of data such as user constants. It stores the sum of
user constant data, recalculates the sum at specific timing, and then checks whether the
stored value matches the recalculated value. This function is a simple method of checking
whether a set of data is correct.
E