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If the contacts on a manual starter cannot be closed immediately after a motor overload had tripped them open, what is the probable reason?
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If the handle of an installed motor starter is in the center position, what condition does this indicate?
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Unit 2
Fractional and Integral Horsepower Manual Motor Starters
| Question | Answer |
|---|---|
| If the contacts on a manual starter cannot be closed immediately after a motor overload had tripped them open, what is the probable reason? | You must allow the overload heaters to cool down for about a couple of minutes before you can turn the motor back on or be reseted again. |
| If the handle of an installed motor starter is in the center position, what condition does this indicate? | Tripped |
| How may an automatic operation be achieved when a manual motor starter is used? | You may use a Pilot Device (flow switch, pressure switch, limit switch, float switch, thermo switch) |
| HINT: What does the term trip-free mean as it relates to manual starters? | It is impossible to hold the contacts closed against an overload. |
| If the overload heater element is not installed in a two-pole manual starter, what is the result? | The motor will not start |
| A fractional horsepower manual motor starter a. starts and stops motor under 1 HP b. has a toggle-switch type of handle and size c. cannot offer low-voltage protection d. does all of these | d. does all of these |
| An automatic operation can be achieved with a. an integral horsepower manual starter with LVP coil b. a push-button-type manual starter c. an FHP manual starter wired in conjunction with a pressure switch d. a fractional HP manual starter | c. an FHP manual starter wired in conjunction with a pressure switch |
| Low-voltage (or undervoltage) protection (LVP) is available on some a. integral HP starters b. FHP manual starters c. two-pole toggle switches d. all of the above | a. integral HP starters |
| Low-voltage protection is used mainly for a. fans b. air compressors c. pumps d. protection of the operator | d. protection of the operator |
| Thermal overload protection a. aids motor warm-up b. prevents motors from freezing c. protects motors and conductors from mechanical damage d. provides overcurrent protection for motors | d. provides overcurrent protection for motors |
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aganotisi