JUKI MOL-254 Engineer's Manual page 231

No. Phenomenon
16 Alarm No. [AL-49] is displayed 8-time flashing, shift of fork position
on the operation box panel
immediately after turning ON
the power.
9-time flashing, fork overrun error
10-time flashing, accumulated pulse overflow
11-time flashing, defective overload
12-time flashing, defective overload
13-time flashing, defective number of rotations
14-time flashing, system error
17 Alarm No. [AL-50] is displayed Alarm frequently occurs, or it is impossible to release the alarm
on the operation box panel. after it has occurred.
18 Alarm No. [AL-51] is displayed Alarm frequently occurs, or it is impossible to release the alarm
on the operation box panel. after it has occurred.
19 Alarm No. [AL-52] is displayed Alarm frequently occurs, or it is impossible to release the alarm
on the operation box panel. after it has occurred.
20 Alarm No. [AL-53] is displayed Alarm frequently occurs, or it is impossible to release the alarm
on the operation box panel. after it has occurred.
21 Alarm No. [AL-55] is displayed Alarm occurs while the belt loop is being fed.
on the operation box panel.
Detailed state
It is considered that adjustment of the fork backward end (origin) sensor is
improper.
In addition, check whether the sensor slit clogs with dust such as lint or the like.
It is considered that connector CN12 or connector directly attached to the sensor
is disconnected, or the cable has broken. Correctly connect it.
Move the fork by hand and remove the mechanical cause when the uneven
torque is large and especially the torque at the top end of the fork is light.
Move the fork by hand and remove the mechanical cause when it does not move
smoothly.
It is considered that the MAIN circuit board has been damaged when the alarm
occurs many times. Replace the circuit board.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
Check whether there is any portion where a load is applied to the belt loop in the
route of the optional auxiliary belt loop supply device and belt loop supply source.
(Belt loop is entangled, and the belt loop rotates in the reverse direction by the
reaction after the belt loop has been fed when the belt loop is supplied by reel.
This gives a load to the belt loop.)
Checking point and corrective measure Replacing part
Fork origin sensor
MAIN circuit board
Fork servo motor
MAIN circuit board
MAIN circuit board
MAIN circuit board
MAIN circuit board
Loop lock detection SW