JUKI LK-1900AN Engineer's Manual page 122

Trouble
11. Error E733
Reverse rotation of the main shaft motor
LED 3 on SDC Board: Flashing 7 times
12. Error E811
Over voltage error
LED3 on SDC board: Flashing 8 times
13. Error E813
Low voltage error
LED3 on SDC board: Flashing 6 times
Cause (1)
11-1) Irregular motor rota- 1-A) Motor connections are inad-
tions
11-2) Incorrect encoder 2-A) The encoder cord is broken
signal transmission
2-B) The driver circuit is out of
12-1) Excessive AC input 1-A) There are variations or
voltage (More than
280V)
1-B) The detector circuit is out of
13-1) Insufficient AC input 1-A) There are variations or un-
voltage (Less than
160V)
1-B) 100V is used despite the
1-C) The detector circuit is out of
Cause (2)
equate or broken.
or out of order.
order.
unusual rise in the AC input
power line.
order.
usual drop in the AC input
power line.
200V setting. (FLT board for
3-phase specifications)
order.
Check and corrective measures
Check whether the connections are correct or
broken around CN16 of the SDC board. [See
the Servo Motor Circuit Diagram.]
Confirm whether each signal is delivered
to CN14 of the SDC board. In the case of
encoder error, replace the motor as a whole.
[See the Servo Motor Circuit Diagram.]
Replace the SDC board.
Check the AC input power line.
Replace the SDC board.
Check the AC input power line.
Check the voltage setting (100V or 200V) in
the FLT board.
If everything is OK after the above checks,
the SDC board is out of order.