SQFlex Service Instructions

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2. Start-up
The starting sequence has three steps:
1. Charging the capacitor
2. positioning of the rotor
3. start.
Consequently, during start-up the motor will make small rotations in order to bring the rotor into the correct
starting position. These rotations also ensure that there is water in the pump and that the pump parts are
lubricated.
During start-up current consumption will be uneven but when the motor has started, current consumption
will be constant.
Helical rotor pumps:
• If sufficient energy is available the pump will normally be running within one minute.
• If sufficient energy is available and the motor does not start within 15 minutes, the pump rotor may be
stuck due to dryness. This situation can arise if the pump has been stocked for some time. Dismantle
the pump and loosen the rotor, or add water to the pump rotor/stator assembly.
• If sufficient energy is not available the starting sequence will be repeated.
Please note that after the pump has started running, it will take a while to fill the riser pipe. How long de-
pends on the energy available, the installation depth and the dimensions of the riser pipe. At moderate en-
ergy supply and high head, it may take up to one hour.
sqflex_SI_US_WG.book Page 22 Thursday, October 1, 2009 3:27 PM