The definition of jogging or inching as described by NEMA is “the quickly repeated closure of a circuit to start a motor from rest for the purpose of accomplishing small movements of the driven machine.” The term jogging actually means to start a motor with short jabs of power at full voltage.
What is the difference between inching and jogging?
Explain the difference between inching and jogging. Jogging is accomplished by starting a motor with short jabs of power at full voltage. Inching is accomplished by starting a motor with short jabs of power at reduced voltage. … By applying full voltage to the fields and reduced voltage to the armature.
What is jogging of DC motor?
2. Jogging • Jogging refers to repeated starting and stopping of a motor in short bursts to perform a particular movement such as moving a crane to a particular location. … The term inching means to start a motor with short jabs of power at reduced voltage.
What is jogging in VFD?
Jog is when you command a variable frequency drive (VFD) to run at a fixed speed and direction for the propose of positioning a machine before you go to system run. Typically jog is activated by a momentary push button.
What function does a jog button perform in a control circuit?
Figure 4-2 is a diagram of a simple jogging control circuit. Pressing the JOG push button momentarily closes the power contacts of the contactor. The motor then runs only as long as the JOG push button is pressed, because no holding contact is present to keep the contactor energized.
What is the main purpose of jogging a motor?
The purpose of jogging a motor is to align some other part of a machine or to slowing advance a machine through its sequence of operation.
What is a jog switch?
DESCRIPTION. The Run-Stop-Jog Switch provides selection between the Main Speed Potentiometer setting or a momentary jog speed, which can be used to index a machine into position.
What is inching in motor control?
Jogging, or inching, is defined by NEMA as “the quickly repeated closure of a circuit to start a motor from rest for the purpose of accomplishing small movements of the driven machine.” The term jogging is often used when referring to across-the-line starters; the term inching can be used to refer to reduced voltage …
What is the requirement of motor starter?
STARTERS. 1) All AC motor starters are to be full voltage, 1 phase or 3 phase, 50/60 Hz, with manual overload reset button in the cover, externally operated with an auxiliary contact. 2) Starter coils shall have 24VDC control. An interposing relay (with a 24 VDC coil) may be required for larger starter sizes.
What is the simplest of all starting methods for a motor?
The Direct On-Line (DOL) starter is the simplest and the most inexpensive of all starting methods and is usually used for squirrel cage induction motors. It directly connects the contacts of the motor to the full supply voltage. … The power and control circuits of induction motor with DOL starter are shown in figure1.
What is the intensity of jogging?
According to the American Heart Association, jogging is a vigorous-intensity physical activity. To achieve vigorous intensity, your target heart rate should be 70 to 85 percent of your maximum heart rate. That 70 to 85 percent is your target heart rate zone.
What is the function of the inch switch or jog switch?
As soon as the push button is released, the motor starter will become de-energized. This jog switch also allows the motor to be jogged from one direction directly to the other direction without having to use the stop button.
What is the safety feature of a lock stop push button?
In an emergency situation, a lock-stop push button can be used intentionally to stop the machine or equipment. If anyone unintentionally touches the push button, then the contact will not be released unless the push button reaches the lock position.