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Watson-Marlow 620DuN and 620Du User Manual 57
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.
Use a 19mm spanner to unscrew the sealing plug. Discard the nylon sealing
washer.
Screw in one of the supplied M16x1.5 cable glands in place of the plug, using
the new nylon sealing washer supplied. Tighten the gland to 2.5Nm to ensure a
seal, using a 21mm spanner. If a different gland is used, it must be watertight
to IP66.
Loosen the gland cap (do not remove it) and pass the cable in through the
gland. When it has passed through the gland, continue to push the cable
through.
The inside of the module is shaped to guide the cable past the printed circuit
board inside. Continued pushing will feed in enough cable to grip inside the
module with the fingers.
Pull through sufficient cable to reach the connectors required. Leave a little
slack.
Strip the outer sheath as necessary and remove 5mm of insulation from the
conductors. No tinning or ferrule is required. Note: If very stiff or large-diame-
ter cable is used, it may be convenient to strip the outer sheath before passing