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7 Troubleshooting <br />Cause <br />Remedy <br />The insulation between the phases <br />1. Use an insulation tester. With a 1000 V DC megger, check that the <br />and ground in the stator is defective. <br />insulation between the phases and between any phase and ground is > <br />5 megaohms. <br />2. If the insulation is less, then do the following: <br />Contact a sales or authorized service representative. <br />The density of the pumped fluid is too <br />Make sure thatthe maximum density is 1100 kg/m3 (9.2 Ib/US gal) <br />high. <br />• Change the impeller, or <br />• Change to a more suitable pump <br />• Contact a sales or authorized service representative. <br />There is a malfunction in the overload <br />Replace the overload protection. <br />protection. <br />If the problem persists, then contact a sales or authorized service representative. <br />Always state the serial number of the product, see Product Description on page 11. <br />7.6 The pump delivers too little or no water <br />DANGER: Crush Hazard <br />Moving parts can entangle or crush. Always disconnect and lock out power before <br />! servicing to prevent unexpected startup. Failure to do so could result in death or serious <br />injury. <br />t <br />WARNING: Electrical Hazard <br />The permanent -magnet motor generates voltage when the shaft rotates, even if power <br />sources are disconnected. Never perform any electrical work if the shaft could rotate. <br />NOTICE: <br />Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in <br />equipment damage. <br />Cause <br />Remedy <br />The impeller rotates in the wrong <br />• If it is a 3-phase pump, then transpose two phase leads. <br />direction. <br />• If it is a 1-phase pump, then do the following: <br />Contact a sales or authorized service representative. <br />One or more of the valves are set in <br />• Resetthe valves that are set in the wrong position. <br />the wrong positions. <br />• Replace the valves, if necessary. <br />• Checkthat all valves are correctly installed according to media flow. <br />• Checkthat all valves open correctly. <br />The impeller is difficult to rotate by <br />• Clean the impeller. <br />hand. <br />• Clean out the sump. <br />• Checkthatthe impeller is properly trimmed. <br />The pipes are obstructed. <br />To ensure a free flow, clean out the pipes. <br />The pipes and joints leak. <br />Find the leaks and seal them. <br />68 Flygt 3102 Installation, Operation, and Maintenance Manual <br />