Water Pump User Manual

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 61
22.2 Wiring up
It is the user’s responsibility to ensure the pump’s safe and reliable operation under
remote and automatic control.
The 0V lines on this pump are commoned and mains transformer-isolated from ground
(floating ground). It can be connected to isolated 0V or grounded 0V interfaces.
Cable entry to the module is via up to four
watertight cable glands. These may be fitted
in place of the sealing plugs which are fitted
to the back of the module when the pump is
shipped.
The number of glands needed depends on the
number of connection cables required and the
convenience of the installer. As standard, four
M16 cable glands are provided with the pump.
Recommended control cable conductors for the terminal blocks: metric = 0.14sq
mm - 2.5sq mm solid and 0.14sq mm - 1.5sq mm stranded. USA = 26AWG - 14AWG
solid and 26AWG - 16AWG stranded. Cable: circular. Max/min outside diameter to
ensure a seal when passed through the standard gland: 9.5mm-5mm. The cable
section must be circular to ensure a seal.
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.