Watson-Marlow 521CC - Manual (Page 10)

9.2 AC three-phase motors: troubleshooting
If the pump will not start make the following checks to determine whether servicing is
required:

Check that mains power is available to the pump.

Check that the motor is connected in the correct Star/Delta configuration.
 Check that the pump is not stalled by incorrect fitting of tubing.
9.3 AC three-phase motors: maintenance

Thoroughly clean and regrease the motor assembly every 10,000 working hours or after
two years at the latest.

Remove any dust deposits from the fan cover to avoid overheating.

Dismount anti-friction bearings for cleaning and refill with a grease such as BP
Energrease LS 2 or Mobil Mobilux 2.
 Ensure that the bearing cage is packed about 1/3 full with an evenly distributed
lubricating grease such as BP Energrease LS 2 or Mobil Mobilux 2.
9.4 AC three-phase motors: gearbox maintenance -
simplex (single pumphead) units

Combine a lubricant change with a thorough cleaning of the gear unit every 10,000
working hours or after two years at the latest.

Extreme working conditions (high air humidity, aggressive media and large temperature
variations) will reduce the interval between lubricant changes.

The first oil change should be carried out after approximately 1,000 working hours to
compensate for run-in abrasion. Examples of suitable lubricating oils are BP Energol GR-
XP 220 and Mobil Mobilgear 630.
9.5 AC three-phase motors: gearbox maintenance -
duplex (twin pumphead) units
The gearbox is filled for life with synthetic lubricant so no maintenance is required.
Always check to ensure that a hazardous atmosphere motor gearbox is
suitably rated for the hazardous zone area in which it is to be mounted.
Hazardous atmosphere motors should be installed only by qualified
personnel.
Any deviation from normal operating conditions (increased power
consumption, temperature, vibrations, noise) or warning signals by
monitoring equipment suggest malfunction. Inform the responsible
maintenance personnel at once. If in doubt disconnect the pump
immediately.
Page 10 of 47 Watson-Marlow Bredel E-Manuals
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