Do I need select high rating AC drive for motor?

Actually, it's no need to use high rating of AC drive than the [...]

By |May 25th, 2016|0 Comments

Why 4-20mA is preferred over 0-10V signal?

My experience has been that most process automation sensors use 4-20mA to stave [...]

By |May 24th, 2016|0 Comments

Difference between DCS and PLC

The differences between DCS and PLC are: DCS (Distributed Control System) is a [...]

By |May 24th, 2016|0 Comments

AC reactor vs. DC choke in AC drives?

The Harmonic Distortion caused by an AC drive is related to its size [...]

By |May 24th, 2016|0 Comments

What is Carrier Frequency in AC drives?

Carrier frequency in fact causes the audible noise. You can diminish the noise [...]

By |May 24th, 2016|0 Comments

What is AC drive?

From a design standpoint, it is most desirable to operate all motors within a plant at full rated speed. Due to product considerations, however, there are many applications requiring variable speed operation. When a process requires the quality of speed variability, variable speed control is necessary. The most common types of variable speed controls in the process industry today are: eddy current clutches, hydraulic couplings, variable pitch sheaves, DC solid state controls, AC variable frequency drives, and control valves. The type of variable speed control finally selected depends on the initial cost, application parameters, and environmental operating characteristics. Tags: Motor control What is AC drive? AC drives allow loads driven by AC induction motors (such as fans and pumps) to operate in a wide range of speeds compared to the motor fixed speed. AC drives are also called variable frequency drives, adjustable speed drives, frequency inverters, or frequency converters. AC drive installations can increase energy efficiency (in some cases energy savings can exceed 50%), improve power factor and process precision, and provide other performance benefits such as soft starting and over-speed capability. They also can eliminate the need for expensive and energy-wasting throttling mechanisms such as control valves and outlet dampers. Typical applications of AC drives AC drives can provide significant savings in applications such as: Variable air volume air conditioning systems Chilled water pumping Exhaust air systems, such as dust extraction, paint shop exhaust, and fume cupboards Refrigeration systems Some modern compressors (including air and refrigeration compressors) […]

By |May 23rd, 2016|0 Comments

Speed / Flow Reducers

From a design standpoint, it is most desirable to operate all motors within [...]

By |May 23rd, 2016|0 Comments

Does motor frequent start affect its lifetime?

Starting a motor puts the highest level of stress on a direct on [...]

By |May 23rd, 2016|0 Comments

Can I control 2 motors with one VFD?

It’s depends, if only you want a Speed Control, you can connect 2 motors with a VFD; You have to consider, you are limited in current, and have to look at the max. current which is provided by the VFD. For the rest, as well as it’s said by the mates, you have to take care with the thermal protections. Don’t forget that the motor’s velocity has to be the same. Make sure that the two motors’ total power rating does not more than the VFD power capacity. For Example if u want to connect 2 motors of 30 kW each then use the 60 kW VFD. Its good practice to use slightly more power of VFD then the total power of 2 motors. […]

By |May 23rd, 2016|0 Comments

What is the electrical engineering roles in pumping system

The good news: centrifugal pumps tend to have no break-away torque, and torque [...]

By |May 23rd, 2016|0 Comments