1. The power supply device should be safe, reliable, normal. Power supply voltage and frequency should be in compliance with the provisions (voltage of 380V + 5%, frequency of 50Hz + 1%), and the instantaneous voltage of the voltage should not exceed 10%. If the power supply from the water pump used from 000 far, the cross-sectional area of the cable should be bold, joints should be as less as possible, otherwise it will enable voltage lowered too much and in cable joint sealing and waterproofing treatment, to prevent leakage;
2. Submersible sewage pump before operation, the use of 0-500 megohm table to check the electrical phase and phase to ground insulation resistance, the minimum value should be greater than 2m K;
3. In the four core cable, with the symbol stilbene for grounding wire (general for the green and yellow lines or black line) in order to ensure the safe use, must be firmly grounded, and compared with other length 50mm;
4. When conditions permit, the electric appliance protecting device can include: grounding protector, earth leakage circuit breaker and so on, however, in any case must accord with electric pump rated current slow fuse fuse.
5. Electrical control device should be damp, well device in the area of moisture, the cable should pay attention to the installation of the pump should not be blocked in the suction mouth of the pump;
6. Check the direction of rotation of the rotor. In the submersible sewage pump for the first time to start or restart the device should check the direction of rotation, the direction of rotation is not correct operation will result in submersible sewage pump efficiency is reduced, or cause the impeller off and other damage to the top of the pump. Prior to for the determination of rotor rotation direction, in the diving sewage pump end device should raise and make a point of operation, meet the following conditions: rotation direction correctly, otherwise, should exchange controller of three-phase line in any two lines of position to change the direction of rotation: looking down from the top of the pump, rotor rotate in a clockwise direction, from the bottom to see [i.e., the suction inlet direction] visible leaf according to counter clockwise rotation.
