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7 Troubleshooting <br />'7 Troubleshooting <br />7.1 Electrical troubleshooting <br />DANGER: Electrical Hazard <br />Troubleshooting a live control panel exposes personnel to hazardous voltages. Electrical <br />troubleshooting must be done by a qualified electrician. <br />Follow these guidelines when troubleshooting: <br />• Disconnect and lock out the power supply except when conducting checks that <br />require voltage. <br />• Make sure that no one is near the unit when the power supply is reconnected. <br />• When troubleshooting electrical equipment, use the following: <br />- Universal instrument multimeter <br />- Test lamp (continuity tester) <br />- Wiring diagram <br />7.2 The pump does not start <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 />Af 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 />An alarm signal has been triggered <br />Check that: <br />on the control panel. <br />• The impeller rotates freely. <br />• The sensor indicators do not indicate an alarm. <br />• The overload protection is nottripped. <br />The pump does not start <br />Check that: <br />automatically, but can be started <br />. The start level regulator is functioning. Clean or replace if necessary. <br />manually. <br />• All connections are intact. <br />• The relay and contactor coils are intact. <br />• The control switch (Man/Auto) makes contact in both positions. <br />Check the control circuit and functions. <br />Flygt 3102 Installation, Operation, and Maintenance Manual 65 <br />