Watson-Marlow 621CC - Manual (Page 7)

7 Installation
Pump
Site the pump on a flat, horizontal, vibration-proof surface allowing a free flow of air around
it. Ensure there is 0.5m of straight tubing before the pumphead inlet and after the
pumphead outlets. Close coupled simplex pumps will require bolting down with four M8
bolts through the gearbox foot mounting holes.
AC motor
 Ensure that mains voltage/frequency are in accordance with motor nameplate
information.

Secure protective conductor connections.

If a three-phase motor is running in the wrong direction, interchange any two
phases.

Close unused cable entrance holes and the terminal box itself in a dust and
watertight manner.

A current overload relay should be fitted to a contact breaker. Connect the motor in
accordance with the wiring diagram which will be found in the motor terminal box.

When a thermal protection switch is fitted in the motor, the leads will be found in the
motor terminal box. They should be connected to stop the pump if the switch
operates. The switch will open circuit at an over temperature condition. See below for
the connection of the drive motor showing possible ancillary switches and
protections.
Page 7 of 46 Watson-Marlow Bredel E-Manuals
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