Watson-Marlow 620U - Manual (Page 58)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 58
The recommended cable and cable glands must be
used for the IP66 (NEMA 4X) version of this pump;
otherwise ingress protection may be jeopardised.
For EMC protection, shielded control cable should be used. The shielding should be
terminated to one of the pcb mounting screws or to the adjacent spade connection
(where fitted).
For improved EMC protection in extremely noisy environments, shielded cable may
be used in conjunction with watertight EMC metal cable glands. These must be
earthed to the module by adding an M16x1.5 nut with serrated edges to ensure
proper contact with the inside of the module. It is necessary to remove the module’s
circuit board to access the interior of the module: it is held in place by two fixing
screws which can be removed and replaced with a cross-point screwdriver. Take nor-
mal anti-static precautions when handling printed circuit boards.
Suitable cables for general-purpose use: 300V with extra premium grade PVC jack-
et with good flame and moisture resistance.
Suitable cables for industrial use: 300V extra-rugged polyurethane grade jacket with
resistance to oils, fuels, solvents and water.
For convenience of wiring more than 8 conductors per cable may be awkward to
handle. Only two appear in the illustrations here, for clarity.