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NUT <br />Trouble <br />Cause <br />Remedy <br />Tripping <br />1. Sustained overload. <br />1. Check for grounds, shorts, or excessive <br />motor currents. <br />2. Incorrect heater or <br />2. Select correct size heater (bo to the <br />ambient temperature <br />next larger size). <br />varies a good deal. <br />3. Motor and starter in <br />3. Install closer to each other, so that the <br />different ambient <br />temperature is the same for both or use <br />temperature. <br />ambient compensated overload. <br />4. Loose connection on <br />4. Clean and tighten. <br />heater screws or load <br />wires. <br />Failure to trip <br />1. Mechanical binding, <br />1. Replace overload and heater. <br />dirt, corrosion, etc. <br />2. Wrong heater, or <br />3. Check ratings and heater tables. Use <br />heaters omitted & <br />proper heater. <br />jumper wires used. <br />4. Relay previously <br />3. Replace overload relay & heater. <br />damaged by short <br />4. Install closer to each other, so the <br />circuit. <br />temperature is the same for both <br />5. Motor and relay in <br />or use ambient compensated overload. <br />different ambient <br />temperatures <br />6. Heater assembled <br />5. Review installation instructions. <br />incorrect) <br />Failure to Reset <br />1. Broken mechanism, <br />1. Replace overload & heater <br />worn parts, <br />corrosion, dirt, etc. <br />Open or welded <br />1. Short circuit on <br />1. In general, fuses over 10 Amp rating <br />control circuit <br />control circuit with <br />should not be installed. <br />contacts in <br />too large protecting <br />overload relay <br />fuses. <br />(Replace overload <br />2. Misapplication: <br />2. Reduce current or get manufacturer's <br />and heater) <br />handling too heavy <br />recommendations. <br />currents. <br />3. Severe vibration. <br />3. Remount control. <br />