Watson-Marlow 520DuN IP66/NEMA 4X User Manual
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22 Automatic control wiring
Interfacing the pump with other devices is by means of screw-terminal connectors
within the 520N watertight module at the rear of the pump. Suitable cable must be
passed into the module through one or more watertight cable glands and connect-
ed appropriately. The module must be removed to allow this.
It is important to check the pump’s voltage setting to
ensure that it matches the supply. The voltage selec-
tion switch is on the rear panel of the drive. The
module must be removed (and replaced) to allow it
to be checked.
22.1 520N module removal and
replacement
To remove the 520N watertight module:
The module is secured to the back of the drive unit by six M5x12 Pozidriv counter-
sunk stainless steel screws.
Remove the six screws using a suitable crosspoint screwdriver, leaving the top
centre screw till last. Even when all screws have been removed, the sealing
strip may cause the module to adhere to the drive. If so, a gentle tap will free
it. Do not use a tool to lever it off.
The sealing strip should be retained within its channel on the face of the mod-
ule. The transparent on/off switch cover should be retained on its flange on the
face of the module. Check the integrity of the seal and the transparent on/off
switch cover. If either is damaged, it must be renewed to maintain ingress pro-
tection.
