0
S1Continuous duty
The motor works at a constant load for enough time to reach temperature equilibrium.
S2Short-time duty
The motor works at a constant load, but not long enough to reach temperature equilibrium. The rest periods are long enough for the motor to reach ambient temperature.
S3Intermittent periodic duty
Sequential, identical run and rest cycles with constant load. Temperature equilibrium is never reached. Starting current has little effect on temperature rise.
S4Intermittent periodic duty with starting
Sequential, identical start, run and rest cycles with constant load. Temperature equilibrium is not reached, but starting current affects temperature rise.
S5Intermittent periodic duty with electric braking
Sequential, identical cycles of starting, running at constant load and running with no load. No rest periods.
S6Continuous operation with intermittent loadSequential, identical cycles of running with constant load and running with no load. No rest periods.S7Continuous operation with electric brakingSequential identical cycles of starting, running at constant load and electric braking. No rest periods.S8Continuous operation with periodic changes in load and speedSequential, identical duty cycles run at constant load and given speed, then run at other constant loads and speeds. No rest periods
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Why a single phase induction motor is not self starting?
Single phase induction motor is not self starting because, when the main winding is excited from a single phase supply, it produces an alternating magnetic field instead of rotating magnetic field in two phase and 3 phase induction motor. According to double field revolving theory any alternating vector can be resolved into two vectors rotating in opposite directions, each having magnitude equal to one half the magnitude of the actual vector. The vectors will be rotating in such a way that their resultant will be zero at every instant. Thus a single phase induction motor fails to produce a net starting torque, and is not self starting.It can be made self starting by any of the methods below1) By using an aux winding in series with a very high resistance2) using two capacitors,in series with the aux wdg,one with intermittent duty and the other one with continuous duty3) Using shaded poles
What is magnetic line voltage motor starter?
A motor starter is a contactor (heavy duty relay) which acts as a remote-controlled on/off switch between the supply and the motor. Its operating coil is energised through an auxiliary stop/start circuit. It also incorporates overload function which will automatically disconnect the motor in the event of a sustained overload current.
What is full load current of 20 HP induction motor in delta?
480V about 20A 240V about 40A look at the nameplate duty cycle and efficiencies vary
What is a disadvantages DOL or direct online starter?
it can not be use for heavy duty motors as well as it requires a high starting current.
What is a welder's duty cycle?
The terminology in the electrical trade as to duty cycle refers to the amount of "on time" as to the "off time". When referring to equipment that have a high current on time, it is usually using components or wire that are sized smaller than what they should be and can not cool themselves.These components can not dissipate the heat generated quick enough and can only be on for a certain amount of time. This type of equipment is given a duty cycle. The duty cycle has to have an equal or greater off time to let the equipment cool down. It is this ratio of "on time" to "off time" that is the equipment's duty cycle.For example, motors due to their design usually have a 100% duty cycle, meaning that the motor can operate continuously without having to be shut down to allow it to cool off.
What is the difference in wiring a 12 3 phase motor at low voltage between run and start?
You have to wire both the run and start windings. The start windings will automatically be removed from the circuit once the motor is at 75% of normal speed. The start winding gives you more torque to start the motor.
What is the reason for the insulation failure of a single winding of a motor and all 3 phase windings of an immersible pump?
The insulation on wires of a motor are very thin and in close proximity in the winding. If too much current flows the wire can heat up and insulation can melt. This deterioration can happen over time. The bare wire can then come in contact with metal parts on the motor and cause a direct short or can short with other parts of the winding and cause a short that effectively reduces the length of the winding. This can happen in both cases you asked about. On an immersible pump if you are demanding a heavier duty cycle on the pump it can fail prematurely. This can happen if your pressure tank on a well is not of sufficient size to handle your water demands.
What is the Definition of continious duty motor?
A continuous duty motor is one which is never turned off.
Difference between fundamental rights and fundamental duty?
difference between duty and right difference between duty and right my answer is: duty is an obligation while right is freedom to exercise a duty like voting. there is a "moral" duty to vote but the right to ignore that duty [ obligation ] to your peril i might add
What is the present excise duty of transformer oil?
to cool a winding of transformer and it is a insulating material and transformer oil is a purifing oil
1985 LT9 heavy duty what the difference between the heavy duty and the regular 350?
4 bolt mains is the only difference I am aware of.
What is the difference between Call of Duty World at War and Call Of Duty Modern Warfare 2?
There is no difference just two different games
Is there a difference between call of duty advance warfare and call of duty advance warfare day zero edition?
Yes, there a difference between call of duty advance warfare and call of duty advance warfare day zero edition.
What is mean by S1 on motor name plate?
It Shows Continuous Duty...
S1 duty cycle?
S1 duty cycle for an electric motor means the motor is configured for continuous running, which means the motor runs long enough to come to full temperature and then rest long enough to fully cool before starting operation again.
What is the difference between Duty-Free and Duty-Paid?
first of all duty means 'tax'. for goods we have to pay tax i.e duty paid, duty free means tax free.
What is the difference between call of duty 4 reflex edition and standard?
their is no frickin difference
