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- #CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR PDF#
- #CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR FREE#
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR FREE#
We can get rid of auxiliary contacts M 1 and M 2 for interlocks and just use TD 1 and TD 2‘s contacts, since they immediately open when their respective relay coils are energized, thus “locking out” one contactor if the other is energized.Įach time delay relay will serve a dual purpose: preventing the other contactor from energizing while the motor is running, and preventing the same contactor from energizing until a prescribed time after motor shutdown.Get Images Library Photos and Pictures. Get Free Forward And Reverse Motor Starter success of the first edition. If the motor needs to drive forward and reverse, or if it needs a variable speed control, then there must be a specific circuit used to drive such an application. This article explains several common control circuit designs for the most typical three-phase motor requirements. The careful observer will notice that the time-interlocking functions of TD 1 and TD 2 render the M 1 and M 2 interlocking contacts redundant. Regardless, a control circuit is necessary. In like manner, TD 2 will prevent the “Forward” pushbutton from energizing M 1 until the prescribed time delay after M 2(and TD 2) have been de-energized. Transcribed image text: 6-6 Write a documented program that will implement the hardwired control circuit shown for stopping and starting a motor in forward and reverse with limit switches providing over travel protection. When TD 1 times out, the contact will close and the circuit will allow M 2 to be energized, if the reverse pushbutton is pressed. When the stop button is pressed, contact TD 1 waits for the specified amount of time before returning to its normally-closed state, thus holding the reverse pushbutton circuit open for the duration so M 2 can’t be energized. This being the case, the normally-closed, timed-closed contact of TD 1 between wires 8 and 5 will have immediately opened the moment TD 1was energized. The interlock contacts installed in the previous section’s motor control circuit work fine (as discussed in previous article), but the motor will run only as long as each pushbutton switch is held down. If the motor has been running in the forward direction, both M 1 and TD 1 will have been energized. Already we discussed about the basics of permissive and interlock circuits in previous post, also discussed about the basic motor control logic using forward & reverse control. If we use contacts that delay returning to their normal state, these relays will provide us a “memory” of which direction the motor was last powered to turn. Let’s begin by adding a couple of time-delay relay coils, one in parallel with each motor contactor coil. This entire assembly consisting of contactor, overload.
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR PDF#
Hat we might like to have is some kind of a time-delay function in this motor control system to prevent such a premature startup from happening. Motor control circuit diagram forward reverse pdf - Kode icd x bpjs pdf, A simple three-phase, volt AC motor-control circuit is shown here, both in pictorial and schematic form. If the fan was still coasting forward and the “Reverse” pushbutton was pressed, the motor would struggle to overcome that inertia of the large fan as it tried to begin turning in reverse, drawing excessive current and potentially reducing the life of the motor, drive mechanisms, and fan. This could be problematic if an operator were to try to reverse the motor direction without waiting for the fan to stop turning.
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If our hypothetical motor turned a mechanical load with a lot of momentum, such as a large air fan, the motor might continue to coast for a substantial amount of time after the stop button had been pressed. Let’s consider another practical aspect of our motor control scheme before we quit adding to it. The “Stop” switch, having normally-closed contacts, will conduct power to either forward or reverse circuits when released. Now, if either forward or reverse circuits are latched, they may be “unlatched” by momentarily pressing the “Stop” pushbutton, which will open either forward or reverse circuit, de-energizing the energized contactor, and returning the seal-in contact to its normal (open) state.