Lenord+Bauer 3 Prevention of damageMeasuring system
GEL 2444 51
English
3.3.3 Air gap between measuring surface and measuring scale
● An enlarged air gap will have a negative effect on the measuring accuracy (the
signal amplitudes may be excessively low).
● An excessively large air gap can result in the loss of the measured signal.
● A reduced air gap will result in overshoot and therefore the possible loss of
pulses.
● If the air gap is very small, a high spot on the target wheel may touch and
damage the measuring surface.
If there are large temperature fluctuations and different coefficients of thermal expan-
sion for the target wheel and mounting, critical changes to the air gap can occur.
Ensure the air gap is in the range allowed in all operating conditions (see table
→ page 62).
Only use the distance gauge supplied.
3.3.4 EMC instructions
To improve the electromagnetic environment, please observe the following installa-
tion instructions:
Only use connectors with a metal housing or a housing made of metallised plastic,
as well as screened cables.
Connect the screen, if foreseen in the screening concept, to the connector hous-
ing.
Connect the screens using large surface area connections.
Keep all unscreened cables as short as possible.
Design the earth connections with a large cross-section (e.g. using a low induc-
tance earth strap or flat conductor) and keep them short.
If there are potential differences between machine earth connections and elec-
tronic earth connections, ensure no equalising currents can flow over the cable
screen.
For this purpose, e.g. lay an equipotential bonding cable with a large cross-section
or use cable with separate double screening.
In case of cables with separate double screening, only connect the screens at one
end.
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