Shielding And Cable Routing - Balluff BTL5-H1-M-P-S94 Serie Manual De Instrucciones

BTL5-H1_ _ -M _ _ _ _ -P-S94
Magnetostrictive Linear Position Sensor – Profile Style
4
Installation and connection (continued)
4.5

Shielding and cable routing

Defined ground!
The BTL and the control cabinet must be at the
same ground potential.
Shielding
To ensure electromagnetic compatibility (EMC), observe
the following:
– Connect BTL and controller using a shielded cable.
Shielding: Braided copper shield with minimum 85%
coverage.
– Shield is internally connected to connector housing.
Magnetic fields
The position measuring system is a magnetostrictive
system. Be sure to provide sufficient distance of the BTL
from strong external magnetic fields.
Cable routing
Do not route the cable between the BTL, controller, and
power supply near high voltage cables (inductive stray
noise is possible).
The cable must be routed tension-free.
Inductive stray noise from AC harmonics (e.g. from phase
angle controls) are especially critical and the cable shield
offers very little protection against this.
The signal is transmitted to the controller via the CANopen
interface.
Preferably use shielded cables where wires 2
and 3 and wires 4 and 5 are twisted.
The transfer rate is dependent on the cable length,
whereby the cable length is limited to a maximum of
2500 m (Ø 6 to 8 mm) (see Tab. 4-4).
Cable length
< 25 m
< 50 m
< 100 m
< 250 m
< 500 m
< 1000 m
< 1250 m
< 2500 m
Tab. 4-4: Baud rates/cable lengths, values are in accordance with
CiA DS 301
®
Stub cables may be max. 0.3 m.
www.balluff.com
Baud rate [kBaud]
1000
800
500
250
125
100
50
20/10
Noise elimination
To avoid equipotential bonding (current flow) through the
cable shield, please note the following:
– Use insulating bushes.
– Put the control cabinet and the system in which the
BTL is located to the same ground potential.
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