Reference Point Approach Fault - Siemens SINUMERIK 808D Service Manual

Case 2
1. Check whether the hardware limit switch wire is short-circuited with the high level signal.
2. Check whether the hardware limit switches are damaged.
3.16

Reference point approach fault

Fault description
Case 1: Press the desired axis traversing key, the position values displayed on the PPU do not change and the axis
does not move.
Case 2: Press the desired axis traversing key, the position values displayed on the PPU change but the axis does not
move.
Case 3: Press the desired axis traversing key, the axis moves until the hardware limit switch alarm appears.
Case 4: Press the desired axis traversing key, the axis always moves in the opposite direction.
Case 5: Press the desired axis traversing key, the axis moves only for a short distance.
Case 6: Press the desired axis traversing key, the machine alarm 20002 appears after the axis exits the deceleration
switch.
Case 7: Press the desired axis traversing key, the Jog operation and automatic program execution run normally, but
the system does not respond when approaching the reference point.
Case 8: When approaching the reference point, the position of the axis is out by the pitch of leadscrew.
Diagnostic steps
Case 1
1. Check if there is an alarm on the PPU screen, and continue operation after eliminating the alarm via the following key:
2. The machine data is lost if the alarms 004060, 004062, and 004065 appear; in this case, it is necessary to restore the
backup data and restart after power-off to check whether the fault has been eliminated.
Case 2
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 settings of machine data MD30130, MD30240, and MD30350 are correct:
MD30130 = 2
•
MD30240 = 3
•
MD30350 = 0
•
Case 3
Check whether the machine deceleration switches and their connections are broken.
Service Manual
01/2017
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