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Siemens SINUMERIK 808D サービスマニュアル
4.
Check whether the handwheel is damaged.
5.
Replacement and maintenance are necessary if the fault still exists after the above inspection, because probably the
PPU is damaged.
3.9

Feed axis fault

Fault description
The following fault cases may occur with the axes referenced:
Case 1:
The screen displays the movement values of the feed axis, but actually the axis does not move.
Case 2:
The actual traversing direction of the axis is opposite to the direction selected in operation or the direction
displayed on the PPU screen.
Diagnostic steps
Case 1
1.
Check whether the control system is in the program test state:
Check whether the status LED for program test on the MCP is lit
•
(it must be off)
Check whether the PRT icon appears in the program status bar
•
on the PPU screen (it must be deactivated)
2.
Check whether the mechanical coupling is loose.
3.
Check whether the connections between the control system and the drives are in good condition, and whether the
terminals on the drives are damaged.
4.
Replacement and maintenance are necessary if the fault still exists after the above inspection, because probably the
PPU is damaged.
Case 2
1.
Check whether the settings of machine data MD32100 and MD32110 are correct as follows:
MD32100: axis traversing direction (default value = 1, change to -1 as required)
•
MD32110: encoder position feedback polarity (default value = 1, change to -1 as required)
•
2.
For the SINUMERIK 808D control system, you should also check
the connections of the terminals +DIR and -DIR on the drives.
3.10

Axis moving direction fault

Fault description
The axis can only move in one direction when the axis traversing keys are pressed in "JOG" mode, and the direction cannot
be changed.
Diagnostic steps
Check whether the corresponding drive is damaged.
18
Service Manual
01/2017