Balluff BML-S Series, User Manual, Page: 50 / 130

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11.1 Troubleshooting
Error Possible causes Troubleshooting/explanation
The controller does not receive any
travel information.
The required supply voltage is not
available.
Check if there is any voltage and that
the BML is correctly connected.
The voltage drop is too high. 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).
Cables are not correctly connected. Check the cables using the wiring
diagrams.
The orientation of the magnetic tape is
incorrect.
The reference point marking must be
on the right side of the sensor head.
Exchange the magnetic tape.
The controller does not receive any
travel information at certain points or an
incorrect position is output when
switched on.
The distance between the sensor head
and magnetic tape is incorrect (in some
places).
Adjust the height/angle of the sensor
head. To check, move the sensor head
by hand over the entire measuring
range.
Some of the magnetic poles of the
magnetic tape are damaged
(mechanically damaged or due to
strong magnets).
Exchange the magnetic tape.
Position signal with strong noise
interference.
The distance between the sensor head
and magnetic tape is too large.
Fasten the sensor head at a shorter
distance from the measuring tape.
Limit switches are not switching
properly
1)
.
The distance between the limit switch
magnets and sensor head is incorrect.
Check the distance from and angle to
the magnetic tape (see section 4.3) and
correct.
The limit switch magnets are mounted
on the wrong side of the sensor head
(incorrect polarity).
Check the position of the limit switch
magnets with reference to the direction
of travel (see section 4.3) and correct.
Reference point signal is not output
1)
. The orientation of the magnetic tape
with reference point is incorrect.
The reference point marking must be
on the right side of the sensor head
(Figure 3-1).
Exchange the magnetic tape.
Non-linearity is outside the tolerance. 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.
Correctly position/orient the sensor
head (see section 4).
1) Only with BML-S_B/E0-Q_ _ _-M41_ _-…/-M42_ _-…
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Appendix
BML-S _ B/C/E0-Q _ _ _ -M4 _ _ - _ 0-KA _ _ /KA _ _-S284
Incremental Magnetic Linear Encoder
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