Appendix; Troubleshooting - Balluff BML-S Série Notice D'utilisation

BML-S _ B/C/E0-Q _ _ _ -M4 _ _ - _ 0-KA _ _ /KA _ _-S284
Incremental Magnetic Linear Encoder
11

Appendix

11.1

Troubleshooting

Error
The controller does not receive any
travel information.
The controller does not receive any
travel information at certain points or an
incorrect position is output when
switched on.
Position signal with strong noise
interference.
Limit switches are not switching
properly .
1)
Reference point signal is not output
Non-linearity is outside the tolerance.
1) Only with BML-S_B/E0-Q_ _ _-M41_ _-.../-M42_ _-...
24 english
Possible causes
The required supply voltage is not
available.
The voltage drop is too high.
Cables are not correctly connected.
The orientation of the magnetic tape is
incorrect.
The distance between the sensor head
and magnetic tape is incorrect (in some
places).
Some of the magnetic poles of the
magnetic tape are damaged
(mechanically damaged or due to
strong magnets).
The distance between the sensor head
and magnetic tape is too large.
The distance between the limit switch
magnets and sensor head is incorrect.
The limit switch magnets are mounted
on the wrong side of the sensor head
(incorrect polarity).
. The orientation of the magnetic tape
1)
with reference point is incorrect.
The sensor head is not moving parallel
to the magnetic tape (for tolerance, see
Figure 4-1).
The distance/angle between the sensor
head and magnetic tape is too large.
Troubleshooting/explanation
Check if there is any voltage and that
the BML is correctly connected.
The linear encoder must have an
operating voltage of 10...30 V DC or
5 V ±5%.
Check the voltage over the sense line
(voltage drop, see page 12).
Check the cables using the wiring
diagrams.
The reference point marking must be
on the right side of the sensor head.
Exchange the magnetic tape.
Adjust the height/angle of the sensor
head. To check, move the sensor head
by hand over the entire measuring
range.
Exchange the magnetic tape.
Fasten the sensor head at a shorter
distance from the measuring tape.
Check the distance from and angle to
the magnetic tape (see section 4.3) and
correct.
Check the position of the limit switch
magnets with reference to the direction
of travel (see section 4.3) and correct.
The reference point marking must be
on the right side of the sensor head
(Figure 3-1).
Exchange the magnetic tape.
Correctly position/orient the sensor
head (see section 4).