Shielding And Cable Routing - Balluff BTL7-T500-M-B/Z-DEXA/B-K Serie Manual De Instrucciones

BTL7-T500-M_ _ _ _-B/Z-DEX_-K_ _/KA_ _/ZA1K
Magnetostrictive Linear Position Sensor – Rod Style
4
Installation and connection (continued)
4.5

Shielding and cable routing

Defined ground!
Please note that the position measuring system
must be connected to the potential equalization
system in accordance with the requirements in
DIN EN 60079-14. The external connection is
accomplished by means of metallic conducting
installation in a grounded area. The flange and
housing are mechanically fixed with electrically
conductive connections, so that no potential
differences can occur between them.
If a metallic conducting installation location is
not possible, the housing must be connected
via the ground screw on the cover.
The BTL and the control cabinet must be at the
same ground potential. A sufficient potential
equalization is required that cannot be
conducted over the cable shield!
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.
– 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 holding cylinder and strong, external magnetic
fields.
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Cable routing
Do not route the cable between the BTL, controller, and
power supply near high voltage cables (inductive stray
noise is possible).
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 installed cable fitting was tested with reduced tensile
force in accordance with EN 60079-0. This is why the
connection cable must be routed in a permanent location
and protected against tension and rotary loads using an
additional clamp. It may not be used with drag chains.
Bending radius for fixed cable
The bending radius for a fixed cable must be at least five
times the cable diameter.
Cable length
1)
BTL7-T Max. 50 m
1) Prerequisite: Construction, shielding and routing preclude the effect of
any external noise fields.
Tab. 4-2: Cable lengths BTL7
english 15