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Janson Controls Technologies (Shenzhen) Co.,Limited 3
HOME > SERVICE CENTER > Normal Questions

Failure ratio of frequency inverters?

1, most of the failures of frequency inverters are cause by environment, motor (insulation), power supply, and some incorrect operatios etc.

2, under the normal conditions, Kinda varialbe frequency inverters' failure ratio is below 0.5%, which is equal or even less than other famous brands.

Janson's warranty policy?


1, Janson provides 24 months warranty to our partners.

2, during the warranty period, if the failure happens due to our quality problem, Kinda provides necessary spare parts free of cost.

Why Janson?

1, Janson is a market proved brand, more than 500,000 units are runing stably on the site.

2, Janson core R&D team members are from Emerson, they got more than 10 years' experiences on this product.
3, Janson inverters build-in world-class components, IGBT from Infenion and Fuji, CPU from Texas Instruments etc.
4, Janson is famous for its cost-effective performance in the market.

How to select frequency inverter?

1, first step

Confirm the motor voltage level and motor power. 

2, second step 
Confirm the application type 
(1) Light load, keep the first step selection; 
(2) Heavy load, select one or two sizes higher.

3, third step 
Check current 
Decision condition: normal running current > selected VFD rated current x 1.1? 
(1) Yes, increase the power of VFD; 
(2) No, keep the original selection. 

4, forth step 
Check the temperature and altitude 
(1) Temperature should be -10~50 degree; 
(2) Altitude should be less than 1000m, otherwise think about derating. 

5, fifth step 
Stop mode confirmation 
(1) Fast stop, needs additional braking system (Braking Unit and Braking Resistor); 
(2) Normal stop, no need additional braking system. 

6, sixth step 
Peripheral devices 
(1) Input reactor, remover harmonics, avoid surge current etc. 
(2) Output reactor, if the motor cable's length longer than 50m. 
(3) DC choke, increase the power factor. 
(4) Output filter, improve output current wave form. 

Why should I use a VFD?

Reduce Energy Consumption and Energy Costs 
If you have an application that does not need to be run at full speed, then you can cut down energy costs by controlling the motor with a variable frequency drive, which is one of the benefits of Variable Frequency Drives. VFDs allow you to match the speed of the motor-driven equipment to the load requirement. There is no other method of AC electric motor control that allows you to accomplish this. 
Electric motor systems are responsible for more than 65% of the power consumption in industry today. Optimizing motor control systems by installing or upgrading to VFDs can reduce energy consumption in your facility by as much as 70%. Additionally, the utilization of VFDs improves product quality, and reduces production costs. Combining energy efficiency tax incentives, and utility rebates, returns on investment for VFD installations can be as little as 6 months.

Increase Production Through Tighter Process Control 
By operating your motors at the most efficient speed for your application, fewer mistakes will occur, and thus, production levels will increase, which earns your company higher revenues. On conveyors and belts you eliminate jerks on start-up allowing high through put. Increase Production Through Tighter Process Control By operating your motors at the most efficient speed for your application, fewer mistakes will occur, and thus, production levels will increase, which earns your company higher revenues. On conveyors and belts you eliminate jerks on start-up allowing high through put. Increase Production Through Tighter Process Control .

Extend Equipment Life and Reduce Maintenance 
Your equipment will last longer and will have less downtime due to maintenance when it's controlled by VFDs ensuring optimal motor application speed. Because of the VFDs optimal control of the motor's frequency and voltage, the VFD will offer better protection for your motor from issues such as electro thermal overloads, phase protection, under voltage, overvoltage, etc.. When you start a load with a VFD you will not subject the motor or driven load to the "instant shock" of across the line starting, but can start smoothly, thereby eliminating belt, gear and bearing wear. It also is an excellent way to reduce and/or eliminate water hammer since we can have smooth acceleration and deceleration cycles.

What is frequency inverter?

Frequency inverter (also termed variable frequency drive (VFD), adjustable-frequency drive, variable-speed drive (VSD), AC drive, frequency converter, motor speed controller etc.) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. 

Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software. 

VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.