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What is the purpose of the holding circuit in a magnetic motor starter?
It hold the main contacts closed until the control circuit through the interlock is broken.
What is the definition of the consumer circuit in electrical installation?
Consumer circuit is a circuit that fixed between distribution line and consumer load control and protection unit is attached in order to prevent overload, leakage and short circuit.
How do you wire a single phase contactor controlled by a pir in a lighting circuit?
Relatively simple. There are two power contacts, you wire the two wires for the line you want to interrupt or connect to these contacts. this is for the simplest type, SPST, one set of contacts to switch a power line on when the control signal is on. There are more complicated contactors with multiple sets of contacts. There are two connections for the control circuit which are typically low voltage AC or DC. Connect these to the control signal, ie, the signal you will use to turn the contactor on or off.
A device with a overload protection used to control a motor is a?
A device with an overload protection used to control a motor is an Overload Relay.
What is potntial and potential free contact?
Potential free contacts (also called "dry contacts") are simply contacts which are physically operated with the main device, but not electrically connected to it. For example a motor contactor often has auxiliary contacts that are operated by the main coil and open and close at the same time as the main contacts but are not used for control of the motor starter. If they are connected to an outside circuit to indicate the status of the starter without being powered by the motor supply they would be considered potential free contacts. These type also called Signal-Contacts. In case of relays and switches if the common/pole is connected internally to a given potential like a 110V phase etc., the contact is not POTENTIAL FREE but if both the common and the normall open (and at time also the normally closed) contacts are presented to the user for connecting in his system as he pleases,the contact is said to be "potential-free".
When using a 3 wire control circuit to control a magnetic motor starter the part that will open the control circuit when an overload occurs will be?
The part that opens the circuit is the overload blocks that are situated below the magnetic starter and before the motor load. The latest addition to the electrical code book states that the "hot" wire goes through the overload contacts first before feeding the 3 wire control system. With the supply voltage in this position the whole circuit becomes de-energized when the motor load trips the circuit. The old standard practice on a 3 wire control system, the neutral was connected to the overload relay contacts. When the overload relay tripped it opened the neutral of the coil circuit and the starter dropped out
Can you use three phase thermal overload relay in a single phase system?
Yes, when using a three phase contactor on single phase, the three phase overload block can be used. The wiring of the contactor consists of taking L1 of the supply and connecting it to L1 of the contactor. The load is connected to T1 on the bottom of the overload block. L2 of the supply is taken to L2 of the contactor. Instead of connecting the T2 to the load, the conductor is taken back to the top and connected to the contactor in position L3. The other side of the load is connected to T3 on the bottom of the overload block. The overload block has three N.C. contacts, one for each leg of L1, L2 and L3. These three contacts are wires in series to the stop - start circuit. Years ago on old schematic diagrams these contacts used to be placed on the up stream side of the magnetic starter's coil. When the overloads tripped the voltage was left on the control circuit which was found to be dangerous for trouble shooting. Now the overload contacts are positions on the beginning of the start- stop circuit so that when a overload trips, the whole stop - start circuit becomes de energized.
Why is your engine control fuse keep blowing?
There is an overload or short to ground in the circuit.There is an overload or short to ground in the circuit.
How does a thermal overload control a circuit when the phase short to ground?
If you are describing a circuit breaker then its electromagnetic trip component will operate in the event of a line*-to-ground (*not 'phase'!) short circuit. The thermal overload component will only operate in the event of a sustained overload.
Why is it that all electrical motor circuits are equipped with both a motor control circuit and a control circuit?
First you need to have hands on experience on industrial electrical components to get great idea. Various components in motor circuits are contactors, breakers etc.. In control circuits we've the coils of contactors breakers, relays, sensors etc.. Take a contactor, it has 6 terminals called main contacts, 3 connected to source 3 connected to motor nd in these 2 sets one is stationary nd other is movable. Initially they're isolated nd when in contact motor is connected to the source. Here motor circuit completes. These pair of main contacts can be get in contact mechanically or electrically. But for speed, accurate nd smooth operation an electromagnetic coil (pick up coil) is arranged in the contactor such than when electric current passes throug this coil it'l attract the movable pair of main contacts to get in contact with the other pair to complete the motoring circuit. Relays sensors protection units can be connected with the pick up coil (control circuit) to ensure customized control on motor.
A motor starter will have a set of auxiliary contacts which is used to provide a?
Feedback to a control circuit that the motor starter has closed or opened its contacts as commanded.
What is the purpose of the holding circuit in a magnetic motor starter?
It hold the main contacts closed until the control circuit through the interlock is broken.
What is the definition of the consumer circuit in electrical installation?
Consumer circuit is a circuit that fixed between distribution line and consumer load control and protection unit is attached in order to prevent overload, leakage and short circuit.
How do you wire a single phase contactor controlled by a pir in a lighting circuit?
Relatively simple. There are two power contacts, you wire the two wires for the line you want to interrupt or connect to these contacts. this is for the simplest type, SPST, one set of contacts to switch a power line on when the control signal is on. There are more complicated contactors with multiple sets of contacts. There are two connections for the control circuit which are typically low voltage AC or DC. Connect these to the control signal, ie, the signal you will use to turn the contactor on or off.
How many switches can be connected to a contactor coil control circuit?
unlimited
A device with a overload protection used to control a motor is a?
A device with an overload protection used to control a motor is an Overload Relay.
When additional stops are added to a control circuit should they be connected in series or parallel?
series
