Interested to Buy Any Domain ? << Click Here >> for more details...
difference between dol and rdol startors?
- 2 Answers
- 33937 Views
- Vijai Electricals, I also Faced
- E-Mail Answers
Answer Posted / madhu
This kind of starter is required when the motor is required
to run in both forward as well as reverse directions
according to the application.
Power circuit: There is one more power contactor connected
across the power contactor in the power circuit with two of
the phases interchanged to achieve reversal of rotation. The
two contactors are mechanically interlocked to ensure that
both of them do not operate simultaneously. The shorting of
two different phases is avoided through this arrangement.
•
Control circuit: The control circuit obviously consists of
two start push buttons, one for ‘FORWARD START’ and another
for ‘REVERSE START’. Each of them controls the supply to the
respective contactor coils responsible for the supply to the
motor in forward and reverse modes. The stop command is
common for both modes since it is independent of type of
operation. The NC contact of forward contactor is connected
in series with reverse contactor coil and that of reverse
contactor is connected in series with forward contactor
coil. This is the electrical interlock, which ensures that
only one contactor will pick up at a time avoiding any
mal-operation and consequent damage to the feeder and
problems to the dependant processes.
•
Indication circuit: One more Red LED is required to indicate
the ‘Reverse ON’ mode.
One NO contact of the reverse contactor is connected in
series with it.
| Is This Answer Correct ? | 43 Yes | 5 No |
Post New Answer View All Answers
In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?
what is invertor supply and raw powersupply
what is the difference between earth leakage and earth fault?
Distribution transformer we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral,we can not connect separate body earthing pit to other earthing pit but we do metal glanding in secondary side cable termination in both side, transformer and PCC panel (LT Panel), is this safe for transformer and other equipment?
Please, if 1kw is equal to 1.25kva; how then do I know how many kva in 7.5kw?
which type of questions asking for solar companies?
defination of controlled shunt reactor
we need a ntpc previous papers
while starting a liquid starter ,is there any volage drop on water/soda on tank.can we touch the tank on starting?
What are the classifications of oscillators?
If a air condition consume 2.50 to 3.00 amp then how much it will consume in watts if it is running 10 hours out of 24 hours????
in science exhibition how lamp can blink when you clap near the lamp ? thank you
Why magnetic flux produces an induced current?? what is the detailed procedure ?? ans plz
Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.
What will happen if we introduce negative feedback to a control system that uses a positive feedback?
