JUKI DDL-900B Instruction Manual page 54

Description of error
No.
detected
E811 Supply voltage fault
E922 Main shaft uncontrol-
lable
E924 Motor driver failure
E930 Faulty encoder
E931 Motor hole sensor
failure
E942 Faulty EEPROM
Cause of occurrence expected
• When voltage higher than guaranteed
one is inputted.
• The machine has been connected to the
power source supply voltage of which is
200 V or less.
• The machine has been connected to the
power source supply voltage of which is
270 V or more.
• In the case the main shaft cannot be
controlled.
• Motor driver has broken.
• In the case a motor signal cannot be
input correctly.
• Data cannot be written on the EEPROM.
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Items to be checked
• Check whether the supply voltage which
falls outside the "rated voltage ± 10 %" is
applied.
• The inner circuit may have broken.
• Check the motor signal connector (CN30)
for looseness and slip-off.
• Check whether the motor signal cord is
caught in the machine head or has a break.