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Troubleshooting
Operating Instructions 550-12-33/34 - 00.0 - 08/2017
Code Type
Possible causes
2403 Error
U-axis stepper motor
step losses:
• Stiff mechanical
2421 Error
U-axis stepper motor:
• Encoder plug (Sub-
• Encoder defective
2422 Information Pulse-wheel search
time out
2430 Error
U-axis stepper motor
not responding
2452 Error
U-axis stepper motor
over current
2453 Error
Overvoltage
2455 Error
U-axis stepper motor
overload (I²T):
• Stepper motor not
• Stepper motor faulty
• Control defective
2456 Error
U-axis stepper motor:
• Stepper motor
• Stepper motor faulty
• Control defective
2462 Error
• U-axis stepper
movement or
blockage
D, 9-pin) not
connected or
defective
moving freely or
blocked
sluggish
motor disturbance
(IDMA auto
increment)
Remedial action
• Remove the cause of the
stiff mechanical movement
or blockage
• Check the connection of
the encoder cable and
replace, if necessary
• Check connection cables
• Check stepper motor for
stiff movement
• Perform a software update
• Replace control
• Replace step motor
• Check the mains voltage
• Remove the blockage or
the cause of the stiff
movement
• Replace step motor
• Replace control
• Eliminate sluggishness
• Replace step motor
• Replace control
• Switch off and on the
machine
175
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