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miniELCOR
61
10.2 Cable connection, grounding
For interconnecting with another devices there it is necessary to use only
shielded cables. On device side shielding of the cable must be attached with metal
body of cable gland (according to Fig. 30). All cable glands of the device are
connected reciprocally. It means that shielding of all cables coming into the device is
interconnected. Thereby is ensured high resistance against electromagnetic
disturbance.
Temperature sensor and external pressure transducer (if included) is also
equipped with cable whose shielding is attached to metal body of cable gland. Metal
part of temperature sensor is insulated. Metal body of pressure transducer is
connected with cable shielding.
During installation of the device and connecting of shielding is important to
avoid creating of ground loop.
Device is not necessary to ground.
For cable connection (size of conductor 0,5 – 1,5 mm
2
) there are used clamps
mounted in the device, in whose nearness there is printed on the board description of
signal which is assigned to each clamp (see Fig. 12). Before connecting cables it is
neccessary first to apply wire-end ferrule on the stripped end of the wire and force on
them by pliers which are supplied by the manufacturer of wire-end ferrules. Wires
ended by ferrules it is possible to plug in to the clamps without need of special tool.
During wire dissconnecting it is neccessary to slightly push nose of the clamp and
carefuly take out the wire.
cable type cable diameter Recommended cable type
Pulse input Shielded 2
wire cable 4 – 6,5 mm
Unitronic LiYCY 2 x 0.25 Lappkabel Stuttgart
SRO 2.22
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External power
feeding Shielded 2
wire cable 4 – 6,5 mm Unitronic LiYCY 2 x 0.75 Lappkabel Stuttgart
Pulse outputs Shielded 6
wire cable 4 – 6,5 mm Unitronic LiYCY 6 x 0.25 Lappkabel Stuttgart
SRO 6.22
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RS-232
connection Shielded 4
wire cable 4 – 6,5 mm Unitronic LiYCY 4 x 0.25 Lappkabel Stuttgart
RS-485
connection Shielded 4
wire cable 4 – 6,5 mm Unitronic LiYCY 4 x 0.34 Lappkabel Stuttgart
Tab. 11 Recommended cable types
Temperature resistance of SRO cable type is given by manufacturer in range -
5°C - +45°C. Manufacturer Lappkabel Stuttgart is guarantee resistance on their
product Unitronik LiYCY for moving lead-wires in range -5°C - +70°C and for
immovable lead-wires in range -30°C - +80°C. From these values ensue also
temperature conditions for mounting of the device.