Watson-Marlow 323E, 323S, 323U and 323Du User Manual 17
We recommend using commercially available supply
voltage surge suppression where there is excessive elec-
trical noise.
E, S, U, Du 10 Connecting this product
to a power supply
A well regulated electrical mains supply is required along with cable connections con-
forming to the best practice of noise immunity. It is not recommended to site these
drives alongside “dirty” electrical mains supplies such as 3-phase contactors and in-
ductive heaters without special attention being paid to unacceptable mains-borne
noise.
The voltage selector is mounted in the switchplate at the rear of
the pump. Set the voltage selector to 115V for 100-120V
50/60Hz supplies or 230V for 200-240V 50/60Hz supplies. Al-
ways check the voltage selector switch before connecting the
mains supply. Make suitable connection to an earthed, single-
phase mains electricity supply. To comply with Safety Standards,
the mains plug must be a separable plug (not a locking type).
Input line fusing: type T1.0AH 250V 20mm time-delayed cartridge fuse, located in
the combined mains IEC inlet socket and fuse drawer at the rear of the pump.
Note: A spare fuse is also provided in the drawer.
Conductor coding
European North American
live brown black
neutral blue white
ground green/yellow green
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