1. What are the problems with AC 3-phase induction motor?
When starting, an AC induction motor develops substantially more
torque (150% to 200%) than is required at full speed, while drawing
8-10 times nominal current (In). Result 1: the stress created by
the excessive torque is transferred to the mechanical transmission
system, resulting in excessive wear and premature failure of gears,
belts, etc. Damage can be inflicted on the machinery which can be
dangerous and expensive to correct. Result 2: the sudden draw of
8-10 times nominal current could, apart from consuming more
electricity than needed, destabilize the power supply and disrupt
production.
2. How does DR. POWER works?
DR. POWER works as a soft starter & energy saver. Through its
embedded software it continuously monitors the “efficiency” of the
motor to ensure the input power to the motor is matched exactly to
the load as it changes.
3. What benefits can DR. POWER provide?
DR. Power provides immediate and long term benefits including –
Soft Start, Optimization, Soft Stop, Improved Power Factor and
Lower Maximum Demand. It increases reliability and produces a more
efficient, cooler operating, smoother and quieter motor with
increased life and reduced maintenance costs.
4. What does Soft Start mean?
Soft start is an electronics term describing any circuit which
reduces excess current during initial power-up.
5. What is the averaged energy saving rate for DR. POWER?
The saving rate will largely depend on the operating conditions and
parameters of the motor. The more time the motor is running under
light-loaded or even empty loaded condition, the higher the saving
rate could be. It can be up to 40% according to our client
reference.
6. What is the product range of DR. POWER?
Tri-phase/ 380–440Volts/ 2.2 - 315 KW OR Tri-phase/ 220Volts/ 2.2 -
186 KW. If you would like to order any models out of our product
range, please consult with our sales people.
7. What kind of application can DR. POWER be used?
DR. POWER is highly recommended for Air Agitators, Baggage
handling, Bottling lines, Circular saws, Compressors, Conveyors,
Crushers, Die-casting machines, Drying plant, Escalators,
Extruders, Granulators, Grinders, Injection-moulding, Hydraulic
systems, Machine tools, Mixers and blenders, Oil Wells, Paper
refiners, Pulpers, Presses, Pumps, Refrigeration, Sewing machines,
Vacuum-forming weaving, knitting, etc.
8. Is DR. POWER suitable for air-condition or elevator?
No, DR. POWER is not suitable for air-condition or elevator because
the working principle of them leaves very little saving space for
DR. POWER.
9. Does DR. POWER generate harmonics?
In common with all Thyristor based switching devices, DR. POWER
produces harmonics during Ramp Up, Ramp Down and in the Optimizing
mode. The only significant harmonics generated are the 5th and the
7th. All harmonics figures are much lower than the recommended
range.
10. What is the unit price of DR. POWER?
Please consult with our sales people and refer to the most updated
price list.
11. What is the service life of DR .POWER?
The average service life is 5 years and we guaranteed it for a
period of 2 years commencing with the date of purchase.
12. Is DR. POWER available in single-phase model?
No.
13. How to select the right model for DR. POWER?
It is recommended that you have a site survey for the motors, in
order to obtain electrical parameters such as capacity, power
factor, current, etc.
14. Is the installation of DR. POWER complicated?
The installation is easy and any qualified electrician can do the
job, but it is highly recommended that the operator should read our
Installation and Commissioning Manual before installation.
15. Is OEM service available?
Yes. Please consult with our sales people for details.
16. What kind of technical support do you provide?
For technical issues, please refer to the Installation and
Commissioning Manual. If the problems still exist or they are not
stated in the manual, please email or call our sales people and
they will do their best to help. You’re also welcome to bring your
technical people to visit our factory.
17. How long is the production time?
Production time is usually two weeks after client’s confirmation of
order.
18. Can we use one DR. POWER on more than one motors?
No. For an accurate reading of the load conditions and operating
parameters, DR. POWER can only be used on one motor.
19. Do you provide spare fuses for DR. POWER?
