Watson-Marlow 720UN and 720SN User Manual
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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 con-
tact 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 normal anti-
static precautions when handling printed circuit boards.
Suitable cables for general-purpose use: 300V with extra premium grade PVC jacket
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 han-
dle. 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.
