JUKI SC-922 Engineer's Manual page 78

No. Description of error detected
E733 Inverse rotation of motor
E799 Predetermined time for thread trimming
sequence is exceeded
E808 Solenoid short circuit
E809 Holding motion failure
E810 Solenoid short-circuit
E811 Abnormal voltage
E906 Operation panel transmission failure
E924 Motor driver failure
E942 Faulty EEPROM
Cause of occurrence expected
• This error occurs when the motor is
running at 500 sti/min or more in the
opposite direction of that of rotation
indication during motor is running.
• Thread trimming sequence control is
not completed within the predetermined
time (three seconds).
• Solenoid power does not become
normal voltage.
• Solenoid is not changed over to
holding motion.
• When the short-circuited solenoid is desired
to be driven.
• When voltage higher than guaranteed
one is inputted.
• 200V has been inputted to SC-922 of
100V specifications.
• JA : 220V is applied to 120V box.
• CE : 400V is applied to 230V box.
• When voltage lower than guaranteed
one is inputted.
• 100V has been inputted to SC-922 of
200V specifications.
• JA : 120V is applied to 220V box.
• Inner circuit is broken by the applied
overvoltage.
• Disconnection of operation panel cord.
• Operation panel has broken.
• Motor driver has broken.
• Data cannot be written on the EEPROM. • Turn the power OFF.
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Items to be checked
• Connection of the encoder of main shaft
motor is wrong.
• Connection for the electric power of main
shaft motor is wrong.
• Check whether the machine head actually
installed is different from the machine head
selection.
• Check whether the actual motor pulley
diameter is different from the motor pulley
setting (effective diameter).
• Check whether the belt has slackened.
• Check whether the machine head cord
is caught in the pulley cover or the like.
• Check whether the solenoid is abnormally
heated. (CTL circuit board asm. Circuit
is broken)
• Check whether the solenoid is short-
circuited.
• Check whether the applied power voltage
is higher than the rated voltage + (plus) 10%
or more.
• Check whether 100V/200V changeover
connector is improperly set.
In the aforementioned cases, POWER
p.c.b is broken.
• Check whether the voltage is lower than
the rated voltage - (minus) 10% or less.
• Check whether 100V/200V changeover
connector is improperly set.
• Check whether fuse or regenerative
resistance is broken.
• Check the operation panel connector
(CN38) for loose connection and
disconnection.
• Check whether the operation panel cord
has broken since the cord is caught in
the machine head.