DAYLIFF D3SP Installation & Operating Manual - Page 11

Browse online or download pdf Installation & Operating Manual for Water Pump DAYLIFF D3SP. DAYLIFF D3SP 16 pages. Submersible borehole pumps

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In order to obtain maximum pump life the number of starts should be controlled

and should not exceed 30 per hour. It is also necessary to start the pump at least

monthly to prevent seizure.

7. MAINTENANCE

No regular maintenance is required though periodically, recommended every 3

months, the installation should be inspected to check operating parameters

including running current, water output, closed head pump pressure and water

quality as well as switchgear condition. Rectification should be carried out as

necessary. Interpretations of various operating problems are given in the Fault

Finding Guide.

Also important is a periodic check of motor winding and insulating resistance,

especially if there is an abnormal operating current or voltage reading. For three

phase motors winding resistance between each pair of phases should not

exceed 10%. For insulating resistance a satisfactory reading is >100MOhm

and if below this some deterioration in motor winding insulation, cable integrity

or cable joint security is indicated. Generally it is satisfactory to keep running the

motor until resistance drops to below 0.5MOhm when the equipment should be

removed and checked.

As a rule periodic lifting and checking of borehole installations is not

recommended until an operating fault is noted as equipment is designed for

continuous operation for an indefinite period.