Shielding And Cable Routing - Balluff BTL5-S1 Serie Manual De Instrucciones

BTL5-S1 _ _ (B)-M _ _ _ _ -K(8)-SR32/SR115/K_ _/F_ _
Magnetostrictive Linear Position Sensor – Rod 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.
Cable length and clock frequency
The clock rate depends on the length of the cable:
Cable length
≤ 25 m
≤ 50 m
≤ 100 m
≤ 200 m
≤ 400 m
Tab. 4-5: Clock frequency as a function of cable length
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.
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.
– Connector version: Shield is internally connected to
connector housing.
– Cable version: On the BTL side the cable shielding is
connected to the housing.
Ground the cable shielding on the controller side
(connect with the protective earth conductor).
Magnetic fields
The position measuring system is a magnetostrictive
system.
Ensure that there is sufficient distance between the BTL
and the transducer/holding cylinder and 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.
Bending radius for fixed cable
The bending radius for a fixed cable must be at least five
times the cable diameter.
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Clock frequency
< 1000 kHz
< 500 kHz
< 400 kHz
< 200 kHz
< 100 kHz
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