psc

PSC Motor


PSC Motor

PSC Motor


PSC Motor

Typical Wiring Diagram for a PSC Motor


Typical Wiring Diagram for a PSC Motor

Definition and Characteristics

  • PSC means Permanent Split Capacitor
  • Run-capacitor permanently connected in series with the start winding
  • Run cap makes the start winding an auxiliary winding once the motor reaches running speed
  • Does not have a start capacitor
  • Because the run capacitor must be designed for continuous use, it cannot provide the starting boost of a starting capacitor
  • Typical starting torques of PSC motors are as low as 30% of rated load, so these motors are not for hard-to-start applications
  • Unlike split-phase motors, PSC motors have low starting currents, usually less than 200% of rated load current, making them excellent for applications with high cycle rates
  • Need no starting mechanism and so can be reversed easily
  • Designs can be easily altered for use with speed controllers
  • Can be designed for optimum efficiency and high power factor at rated load
  • Considered to be the most reliable of the single phase motors, mostly because no starting switch is needed

Applications

  • Fans and blowers with low starting torque needs
  • Intermittent cycling uses such as adjusting mechanisms, gate operators and garage door openers
  • Uses which also need instant reversing

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CSR Motor

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CSR Motor Definition and Characteristics CSR means Capacitor Start Capacitor Run (CSCR), typically shortened to CSR High starting torque Can handle high-demand loads 1-10 HP Can be designed for lower full-load currents and higher efficiency Operates at lower temperature than other single-phase motor types of comparable horsepower Only disadvantage to a CSR motor is its higher price - mostly the result of more capacitors, plus a starting switch Able to handle applications too demanding for any other kind of single-phase motor A CSR motor uses a potential relay or start relay (see Discussion below) Discussion Potential or "voltage" starting relays are used with single-phase capacitor-start/capacitor-run motors, which need relatively high starting torque. Their main function is to assist in starting the motor. These starting relays consist of a high-resistance coil and a set of normally closed contacts. The coil is wired between terminals 2 and 5, with the con...
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Electrical Control Circuit Schematic Diagram of Permanent Split Capacitor Motor

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Electrical Control Circuit Schematic Diagram of Permanent Split Capacitor Motor PERMANENT SPLIT  CAPACITOR  MOTOR Figure 1: A permanent-split capacitor-run motor with the capacitor mounted on the motor Figure 2: An externally reversible permanent-split capacitor motor. To reverse, interchange   leads  T5 and T8 Figure 3: A two-voltage permanent-split capacitor motor connected for 115 volt operation Figure 4: A single-value three-lead reversible permanent-split capacitor motor Figure 5: A two-speed single-value capacitor-run motor Figure 6: A  schematic diagram  of a three-speed single-voltage capacitor-run motor
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Electrical Wiring Diagram Star Delta Control and Power Circuit Using Mitsubishi PLC Program

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This article is intended to diagrammatically demonstrate the concept of the wiring principle of a star delta (wye delta) motor control and power circuit when using a PLC (Programmable Logic Controller) ladder program to control the switching of a 440 volts induction motor. The electrical components comprising the hardware parts of the circuit includes: 1.) 440 volts to 220 volts step-down transformer - 1 piece 2.) 220 volts to 24 volts step-down transformer - 1 piece 3.) 24VAC to 24VDC power supply converter - 1 piece 4.) Normally-open push  button  switch -  2 pieces 5.) Mitsubishi PLC (Programmable Logic Controller) Type FX2N-16MR-ES - 1 unit 6.)  Auxiliary  relay with 24VDC coil and minimum 1 Normally-open contact - 3 pieces 7.) 3 phase 440 volts AC NFB (No-fuse Breaker) circuit breaker (ampere rating depends on motor capacity) - 1 piece 8.) 3 phase 440 volts AC magnectic contactor with 220 VAC coil (ampere rating depends on motor capaci...
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