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Watson-Marlow 620DuN and 620Du User Manual 56
To replace the 620N watertight module:
Check that the fuse in the fuseholder (ringed) does not need to be replaced.
Check that the voltage selector switch is correctly set.
Check that the sealing strip is fully in its channel on the face of the module.
Attach the module’s earth link wire. Replace and tighten its screw to 2Nm.
Push home the female (upper) and male 25-way D-connectors.
Hold the module in place. Do not disturb the seal or pinch the earth link wire or
D-connector ribbon cables, and screw in the retaining screws (top centre first).
Tighten to 2.5Nm.
Note: The 620N module must be properly fitted using all six screws. Without them,
the screw holes may corrode and IP66 (NEMA4X) protection will be compromised.
22.2 Wiring up
It is the user’s responsibility to ensure the pump’s safe and reliable operation under
remote and automatic control.
This pump’s 0V lines 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 plugs which seal 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 cables must be used
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 stan-
dard gland: 9.5mm-5mm. The cable section must be circular to ensure a seal.
The recommended cable and cable glands must be
used for the IP66 (NEMA 4X) version of this pump;
otherwise ingress protection may be jeopardised.