Omron OMNUC W Series User Manual page 365

Troubleshooting
Display Display Alarm code
ALO1
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
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Error detection Error detection
function function
ALO2 ALO3
OFF ON Low voltage
OFF ON Overspeed
ON ON Overload
ON ON Overload
ON ON Dynamic brake over-
load
ON ON Inrush resistance
overload
ON ON Overheat
OFF OFF Backup error (ABS)
OFF OFF Checksum error
(ABS)
OFF OFF Battery error (ABS)
OFF OFF Absolute error (ABS)
OFF OFF Overspeed error
(ABS)
OFF OFF Encoder overheating
(ABS)
OFF OFF Speed command in-
put reading error
OFF OFF Torque command in-
put reading error
OFF OFF System error
OFF ON Runaway detected.
OFF ON Multi-turn data error
(ABS)
OFF ON Encoder communica-
tions error
OFF ON Encoder parameter
error
OFF ON Encoder data error
OFF ON Multi-turn limit dis-
crepancy
ON OFF Deviation counter
overflow
ON OFF Motor-load deviation
over Level
Cause of error Cause of error
Main circuit DC voltage below the allowable
range.
Servomotor rotation speed exceeded the
maximum speed.
Output torque exceeded 245% of rated
torque.
Output torque continued at 120% to 245%
of rated torque.
Regenerative energy exceeded the dynam-
ic brake resistance during dynamic brake
operation.
Inrush current exceeded the inrush resis-
tance during power supply inrush.
Abnormal temperature rise detected in radi-
ation shield. (Applicable to drivers
100/200 V, up to 1 kW with external ther-
mostat.)
Encoder backup power supply dropped.
Checksum error for encoder memory data.
Encoder battery voltage dropped (to 2.7 V
or lower).
Encoder internal data error
Servomotor rotation speed exceeded 200 r/
min when encoder power was turned ON.
Abnormal encoder temperature rise de-
tected.
The A/D end signal was not output from the
A/D converter within a fixed time.
The A/D end signal was not output from the
A/D converter within a fixed time.
A control circuit system error was detected.
The Servomotor runs out of control.
Absolute encoder setup was incorrect.
No communication between encoder and
Servo Driver.
Encoder parameters are corrupted.
Data from the encoder is corrupted.
The multi-turn limits for the encoder and the
Servo Driver do not conform.
Deviation counter's residual pulses exceed-
ed the deviation counter overflow level set
in Pn505.
The Motor-load Deviation Over Level was
exceeded for fully closed and semiclosed
encoders.
Chapter 5
5-7