Siemens SINUMERIK 808D Service Guide

Service guide 808D turning and millingpage 16
Hardware limit
switch fault
Startup cannot
return to the
reference point
Fault description:
1. Hardware limit switch alarm appears on the PPU.
2. The machine has crossed the hardware limit switch, but can still move, no
alarm.
If the fault is: Hardware
limit switch alarm appears
on the PPU.
If the fault is
：
Press the axis + (or axis-) key, the screen coordinates
do not change and the machine does not move.
If the fault is
：
The machine has crossed the hardware limit
switch, but can still move, n
o alarm.
Fault description:
1. Press the axis + (or axis-) key, the screen coordinates do not change and
the machine does not move.
2. Press the axis + (or axis-) key, screen coordinates change but the machine
does not move.
3. Press the axis + (or axis-) key, the machine can move until the hardware
limit switch alarm appears.
4. Press the axis + (or axis-) key, the machine is always moving in the opposite
direction.
5. Pre
ss the axis + (or axis-) key, the machine moves only a short distance.
6. Press the axis + (or axis-) key, the machine alarm 20002 appears after exiting
the slowdown switch.
7. Press the axis + (or axis-) key, the start point and automatic processing
program are running normally, but the system does not respond when returning
to the reference point.
Diagnostic steps
Diagnostic steps
Case1
Case1
Case2
Service case
of hardware
fault
Press the "Reset" button on the PPU and press the direction key controlling
the feed shaft movement on the PPU at the same time to make the
feed axis move in the opposite direction and break away from the hardware
limit switch. The alarm can then be cleared.
The hardware limit switches on the machine must be checked if these
methods do not resolve the fault.
1. Use a multi-meter to check whether the har
dware limit switch connection is good.
2. Check whether the hardware limit switches are damaged.
Check if there is an alarm number on the PPU screen, continue operation
after eliminating the alarm via the
“
Reset
”
key.
The machine data is lost if the alarm numbers 004060/004062/004065
appear; in this case, it is necessary to back up the data and restart after
power-off to check whether the fault has been e
liminated.
Check whether the hardware limit switch connection is short-circuited
with the high level.
Check whether the hardware limit switches are damaged.

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English