Single Phase Motors Obj.2 Flashcards
What are the terminal numbers for the run winding and start winding in a Single Voltage, Split Phase Motor?
Run winding T1 & T4
Start Winding T8 & T5
In the LOW Voltage (dual voltage) Split Phase Motor, how is the second run winding connected?
In parallel with the other run winding and start winding
In the HIGH Voltage (dual voltage) Split Phase Motor, how is the second run winding connected?
In Series with the other run winding
This is so all windings see the same voltage
In the HIGH Voltage (dual voltage) Split Phase Motor, how is the start winding connected?
In Parallel with one of the run windings
What are the terminal numbers for the run winding and start winding in a LOW Voltage (dual voltage) Split Phase Motor?
Run winding T1 & T2
Run Winding T3 & T4
Start Winding T8 & T5
What are the terminal numbers for the run winding and start winding in a HIGH Voltage (dual voltage) Split Phase Motor?
Run winding T1 & T2
Run Winding T3 & T4
Start Winding T8 & T5
In the LOW Voltage (dual voltage) Split Phase Motor I line = ?
I line = I winding X2
In the HIGH Voltage (dual voltage) Split Phase Motor I line = ?
I line = I winding
How are each of the windings rated in the LOW/HIGH Voltage (dual voltage) Split Phase Motor?
Each winding is rated on the lowest voltage on the nameplate
How are each of the windings rated in the LOW/HIGH Current (dual voltage) Split Phase Motor?
Each winding is rated on the highest current on the nameplate
What type of protection does the Integral Thermal Protection provide?
Overload protection
Required by the CEC
How is the OL Heater sized in the Integral Thermal Protection?
It is sized based on the current of ONE Run Winding
What are the physical properties Integral Thermal Protection devices?
Contacts are N/C
Usually a Disc Type
Built in device with a manual reset (can be automatic)
What are the three main components of a Two-Valve Cap Motor?
Cut Out Switch (centrifugal switch)
Start Cap of higher capacitance
Run Cap
What is another name for a Two-Valve Cap Motor?
Capacitor Start
Capacitor Run
What are the physical properties of the windings in the Cap Start and the Cap Run motors?
The main and aux windings are identical
For higher starting torque and lower starting current
What type of Cap is found in a Cap START Motor?
Dry electrolytic type
100 to 300 µF
How is the Cap of a Cap START Motor sized?
It is sized for a 90° phase shift between I start and I run
What is the Cap START Motor rated for?
Short duty
Can only allow 20 starts for 3 seconds per hour
What is another name for the Cap RUN motor?
Permanent Split Capacitor Motor
What type of Cap is found in a Cap RUN Motor?
Oil filled type
10 to 50 µF
Does the Cap RUN have high or low starting Torque?
LOW
What is the Cap RUN Motor rated for?
Continuous duty
What are the advantages to having a Cap RUN motor?
Quiet motor
Improves PF
What are the advantages and disadvantages of a TWO VALVE Cap Motor?
High starting torque
Quiet and smooth while running
Low current
Improved Power Factor
Most expensive because of the oil filled caps
Is the TWO VALVE Cap reversible or reversing? How?
Reversible
Swap T5 and T8
What is the Hp range for a TWO VALVE Cap motor?
1/4 to 15 Hp
How is the Start Cap wired in the TWO VALVE Cap motor?
In series with the C.F. switch
In parallel with the Run Cap
What type of Cap motor does NOT have a Centrifugal Switch?
Cap RUN (permanent split cap)
What is the current range during start of a TWO VALVE Cap motor?
Cap START = 3.5 - 4.5 FLA
What is the torque range during start of a TWO VALVE Cap motor?
Cap START = 250% - 450% Rated Torque
