20
Common Complications
If the pump is not delivering the required volume, or not pumping at all, the following is a checklist
to diagnose the problem.
Measure Flow and compare with Commissioning Report
Check & Clean Modules
Check Array Angle
Check for Shading (early morning and evening in particular)
Check input Voltage (from Modules)
Check Pressure Switch / Float Switch
Check Pressure Gauge readings
Check flow with delivery pipeline disconnected
Check Suction Height
Check for broken or burnt cells on the modules.
If the pump doesn’t work at all, check the following,
Carefully check the Electric Cable to the Motor. Especially check any underwater cable splice.
Check the Pressure Switch/ Float Switch is operating.
Disable the Pressure Switch/ Float Switch and retry starting the Motor (Use care when
disabling – ensure that the Controller is turned off)
Examine pump for a blockage – sand, tree roots, snakes, algae, etc.
Check the Bore has an adequate water supply.
If the pump has a suction head – Check the height from the water to the pump.
Dismantle Pump and check for wear – a worn helical rotor will pump some water at low head,
but the flow will die once the head is increased.
Examine pump, check for corrosion, erosion, and broken pump shaft.
Examine Check Valves
Check the wiring from the Modules.
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