Balluff BML-S1G0-B7-M5E-0-S284 Serie Betriebsanleitung Seite 72

BML-S1G0-B/S7_ _-M5E_-_0-(SA26-)S284
Absolute Magnetically Coded Position Measuring System
12
Appendix
12.1 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 at certain
positions when switched on.
Non-linearity is outside the tolerance.
A position substantially larger than null is
output near the start of the magnetic
tape.
Position extremely high (negative value)
Mean value of the analog voltages is too
low (< 2.4 V)
LED does not light up solid green.
Error bit = low (BiSS) or high (SSI),
warning bit = low (BiSS)
Resolution only half of specification on
type code breakdown, e.g. 2 µm instead
of 1 µm.
During switch-on, the BML transmits a
position signal. After a short movement,
an error occurs (inconsistency).
The direction of the real-time signal and
absolute value do not match.
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Possible causes
The required supply voltage is not available.
The voltage drop in the supply line is too
large.
The sensor head is not properly 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 sensor head is not moving parallel to
the magnetic tape (for tolerance,
see Fig. 4-1 to Fig. 4-3).
The distance/angle between the sensor
head and magnetic tape is too large.
Sensor outputs a negative position.
Start set function has not yet been
performed.
Voltage drop in the supply
See LED error code, (section 8), and for
BiSS see additionally the register datum for
error byte 0x48
+Clk/–Clk or +Data/–Data reversed
The orientation of the magnetic tape is
incorrect. See the magnetic table labeling in
Fig. 3-2.
Check the controller configuration; change if
necessary.
Troubleshooting/explanation
Check if there is any voltage and that the BML
is correctly connected.
The position measuring system must be
supplied with a supply voltage of 5 V ±5%.
Check the pin assignment using the wiring
diagrams.
Check the orientation of the magnetic tape/
sensor head and correct, if necessary.
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.
Correctly position/orient the sensor head (see
section 4).
Move the sensor head to the beginning of the
area of travel and perform the start set function
there.
Move the sensor head to the beginning of the
area of travel and perform the start set function
there.
Increase the supply voltage 5 V to compensate
for the voltage drop.
Error 1 (red): Switch sensor head off/on,
exchange sensor head
Error 3 (red): Reduce SSI clock rate
Error 4 (red): Increase the supply voltage
slightly
Error 1 (orange): Travel by approx. 30 mm in
direction X
Error 2 (orange): Reduce gap, exchange
magnetic tape
Error 3 (orange): Exchange magnetic tape
Error 4 (orange): Switch sensor head off/on,
exchange sensor head
Check wiring.
Remove the magnetic tape and replace it with a
new magnetic tape with the correct orientation.
If necessary, change the controller configuration
or real-time signal count direction by switching
+A and –A or +B and –B.
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