final report of internship EWB Rwanda Mukindo water project by Ntambara Sylvestre Owen Berbason

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Cable entries and external sockets There are cable glands and plug sockets in the bottom of the controller. The sockets for the plug connections are pre-wired and pre-assembled in the controller housing. Three plugs are included in the delivery. The plugs are used to connect the pump accessories low water sensor, remote float switch and solar panel for Sun Switch. Accessories which use cable glands B1-B6 must be fixed tightly in the glands for strain relief and sealing. Preparing plugs – Cut the wire of the plug in half and splice the cables of the corresponding pump accessory to it. Use a proper crimping tool and sleeves matching the cable size. If a plug socket isn’t used set the mini plug into the socket of the controller housing without cutting the cable in half. Exception for solar panel for SunSwitch – The plug of the solar panel for SunSwitch has a red (positive +) and a black (negative –) cable. Ensure you have the correct polarity. A voltage reversal will lead to damage of the controller. The Plug has a plastic pin that fits into a groove in the socket for the plug to ensure correct plug installation. Spare mini plugs are available, please contact your supplier for further information. Check “Table 6: Mini plug sockets description” below for details of the plug connections. Figure 10: Bottom view of PSk2 controller: cable entries and external sockets Table 6: Mini plug sockets description
Figure 11: Mini plug for pump accessories Solar panel for Sun Switch The PSk2 controller is supplied with a special small 1.5 Wp PV module (pre-wired for crimping). This PV module is used to measure the solar irradiation and allows you to set irradiation dependent START / STOP values for the pump. These settings can only be done via LORENTZ Pump- Scanner. (Please check LORENTZ partnerNET and the “PS DataModule and PumpScanner” manual). Mount the PV module with the same alignment as the solar array that powers the pump system. For example, if the solar array is tilted at an angle of 20°, the PV panel for the Sun Switch should be tiled the same. You can ensure this by mounting the PV module on the frame of the PV module array. The plug of the small solar panel for Sun Switch has a red (positive +) and a black (negative –) cable. Take care of correct polarity. The plug has a plastic pin that fits into a groove in the socket for the plug. This ensures correct plug installation. If you need to switch external units ON/OFF. Grounding Why ground? Before starting to work on the electrical system make sure that all components are disconnected from the power source. Only switch on the system when you have finished all work. Grounding is mandatory to protect the users from potentially fatal electric shocks. It also protects against electric charging or a short circuit inside the device. This is accomplished through clamping, bolting or other mechanical means to provide an effective grounding path to the earth to ensure safe operation at all time. The grounding is also important to the system for lightning protection. In general, it is meant for indirect lightning strikes and induced electrical potentials during operation of the pump system. How to ground? A protective earth connection for the controller must be connected to the left GND terminal. The right GND terminal, next to the motor phases (L1, L2, L3), is for the protective earth wire of the motor. Insufficient ground source Where there is an inadequate ground source you can use a grounding rod. A grounding profile rod should be located about 4 – 5m (13 – 16 ft) from the controller. The cable must not carry any mechanical loads. The rod must be completely buried in the ground (0.5 m / 1.5 ft below ground level). You must refer to local standards and requirements. The grounding cable should be a copper cable with a cross section of not less than 16 mm2 (AWG 6).
Page 1 and 2: SOLAR PUMPING SYSTEMS With reductio
Page 3 and 4: Performance under standard test con
Page 5 and 6: The Problem Some solar pumps (e.g.
Page 7 and 8: Both, the SunSwitch and the float s
Page 9 and 10: dropped below the level of the well
Page 11 and 12: Technical data ‣ Max. voltage: 14
Page 13 and 14: ‣ Lightning surge protection devi
Page 15 and 16: Model Pump model definition for C-S
Page 17 and 18: Mounting, space and ventilation req
Page 19: Terminal type PS40k2 In PS40k2 cont
Page 23 and 24: Pump Installation The pump dimensio
Page 25 and 26: Make sure that the clamps rest on a
Page 27 and 28: After connecting the two pipes lift
Page 29 and 30: The maximum recommended sand conten
Page 31 and 32: Float switch requirements: (1) A sw
Page 33 and 34: ‣ SOURCE LOW (red) - The water so
Page 35 and 36: DESIGN OF SOLAR POWER SYSTEM and CA
Page 37: If PV modules are in series, then V

final report of internship EWB Rwanda Mukindo water project by Ntambara Sylvestre Owen Berbason

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