Bühler technologies EGK 2A Ex, Installation And Operation Instructions Manual, Page: 15 / 61

EGK 2A Ex
The sample gas cooler may only be operated with a suitable protective motor switch as overload protection. A suitable approved
version of the protective motor switch protected against explosion is required when installing in an explosive area. A selection
of suitable protective motor switches for safe and for explosive areas are available as accessories (see chapter
Spare Parts and
Accessories [> page 27]).
The setting of the protective motor switch varies by cooler version. For the correct setting, see chapter Technical Data [>
page 31].
The supply line cross-sections must be suitable for the rated current.
The status outlet can also be connected to an intrinsically safe inlet. The specifications for this inlet must be met. The capacity
and inductance of the contact are zero, so that only the cable used must be considered.
Connecting the cooler
– On the black terminal box, loosen the four screws in the corners of the face.
– Carefully lift off the cover: The control elements are attached to the to the electronics with cables.
– Turn the cover and set down on the cooler. Be careful not to tension the cables.
– Feed the cable for the status signal through the front left and the cable for the supply voltage through the front centre cable
fitting.
– Connect according to the drawing in the appendix. The insulation of the individual conductors only need to be stripped by
5 mm. Do not use cable end sleeves.
– The earth connection is placed on a copper rail, see drawing 41/170-10-3. The screw together with the pressure piece should
be screwed into the copper rail at a tightening torque of 2.2 Nm.
– Now close the housing, remembering:
– Tighten the 4 screws to a tightening torque of approx. 4 Nm.
– No foreign objects, contaminants or moisture may be inside the junction box of the sample gas cooler. Close the box dust-
and waterproof (be sure not to crush any cables!). Use the original seal when closing the junction box. Openings not being
used must be covered with approved plugs per Atex. Tighten all screw connections.
– Connect the potential equalisation of the cooler (threaded bolts below the terminal box) to the potential equalisation on
site. Stray electric currents may not flow through this connection.
– Run the lines so the insulation will not be damaged. If necessary, secure the lines with suitable means and ensure the ad-
equate cable relief of the connecting cable.
13 Bühler Technologies GmbH BE450020 ◦ 01/2020