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ETC Series Inverter Controlled Oil-free Screw Air Compressor

ETC series inverter controlled oil-free screw air compressor with an unprecedented level of energy savings has attained the industry's best control capability.

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Working principle of inverter controlled screw compressor:

VSD compressor monitors the system air demand and forming a closed control circuit with frequency inverter and inverter duty motor. The largest working pressure could be set in PLC controller and the system pressure being sourced by pressure transducer. The signal is then converted to 4-20 mA current signal and revert back to the controller. This signal is compared with the pre-set value by PID calculation instantaneously which provides accurate data for the frequency inverter to output corresponding frequency to change the motor speed and in return to deliver the adequate air capacity to match preciously with the system air demand. And at last it achieves the aims of constant pressure air delivery and energy saving.


Principle of Vector Control VSD Technology:

The integrated flux vector control of the inverter system makes it possible to achieve high torques, even at low motor speeds. The sensor-less vector control system of the INV series enables fast,high-precision speed and torque regulation. Fast response/high accuracy speed control (zero speed control, servo lock), torque control and position control can be performed. Vector control frequency inverter offers excellent control characteristics equal to those of DC machines.


 


How does it actually be energy-saving?
 

First Saving: Air delivered according to system demands, on/off control losses are eliminated

VSD compressor precisely follows the varying air demand by adjusting motor rotation speed, this prevents unnecessary full load high current operation and energy consumed during unload operation (approx.45% of full load amount).

 

Second Saving: Precise pressure control, avoiding wastage due to start/stop pressure band VSD compressor delivers air at stable net pressure(e.g. 6bar.g), this not only maintains accurate target working pressure but also avoids losses due to high current operation within cut-in/cut-out pressure band.

Standard compressor starts up under high current, it operates at full load condition until cut-out pressure (e.g. 8bar.g) is reached, and starts up again when pressure drops to cut-in pressure (e.g. 6bar.g). This start/stop control creates two wastages: (i)losses incurred during unload operation; (ii)losses due to 8-6=2 bar.g cut-in/cut-out differential pressure.

Standard compressor operates between the range of 6 and 8 bar.g, it means 6 bar.g delivered pressure can meet with production requirement, the additional 2 bar.g pressure is an inherent wastage of standard compressor.


Sample calculation of energy saving:

For example a standard 55kW screw compressor delivers air at 70% loading and operates 5800 hours per years. Taking electricity cost of USD 0.15/kWH, the additional energy consumed as comparing with VSD compressor will be:

A. Energy consumed during unload operation assuming unload shaft power absorbed is 45% of full load amount:  30% unload times x loss during unload time = (45% x 55kW) x 5800 hour/year x USD 0.15 = USD 6,460/year

B. Energy consumed due to cut-in/cut-out pressure band of 2 bar.g assuming this counts for 14% of full load amount: 70% loading time x additional 2 bar.g of differential pressure loss = (14% x 55kW) x 5800 hour/year x USD 0.15 = USD 4,689/year

Total energy saved by using VSD compressor will be = USD 6,460/year + USD 4,689/year = USD 11,149/year

In a conclusion, a VSD compressor can save annually the electricity cost of USD 11,149, 3 years can then save USD 11,149 x 3 = USD 33,447, which could be more than capital investment for purchasing another VSD compressor.


Direct energy saving with 70% loading and operating 5,800 hours per year:  

Model KB22 INV KC37 INV KD55 INV KD75 INV KE90 INV KE110 INV KE132 INV KF160 INV KF220 INV KF250 INV
Saved electricity costUSD/ per year 4460 7500 11149 15203 18244 20593 26758 32434 44596 50678



Features of ADEKOM Inverter Controlled Screw Compressor (Direct Energy Saving of 15-35%)

World renowned frequency inverter is housed that brings an unprecedented level of energy savings;

Advanced Vector Control with dedicated motor has attained the industry's best control capabilities; 

Low load operation of a VSD compressor does not result in energy losses;

Load/no load transition losses are eliminated;

The precise pressure control of the VSD compressor allows for a tighter and often lower discharge working pressure, resulting in reduced energy consumption.

The soft rise in motor starting current from zero to full load without any damaging current peaks leads to an almost unlimited motor starting frequency (number of possible motor starts per time period without overheating). The continuously variable acceleration and deceleration reduces dynamic loading of moving parts.



Advanced Variable Speed Drive System


Bulit-in PID funtionality

Limitation of operation time at low speed

PTC probe management

Auto-restart funtion with configuable response time

Underload and overload detection

Low-flow detection

Sleep/wake function

Power used, power-on time and motor run time






VSD Application Microprocessor Based PLC Controller

The simple-to-use automatic electric control panel continuously monitors and
displays overall system performance status (including varying frequency, speed
and shaft power) with pro-active service indications, alarms for malfunctions
and safety shutdowns. 
Advanced remote control as option.

Model KB22ET(INV) KC30ET(INV) KC37ET(INV) KC45ET(INV) KD55ET(INV) KD75ET(INV)
Discharge capacity /Discharge pressure m³/min /bar(g) 3.62/8 5.20/8 6.42/8 7.62/8 10.10/8 12.96/8
3.25/10 4.80/10 5.69/10 6.71/10 8.70/10 11.39/10
2.93/13 4.05/13 4.69/13 5.54/13 7.45/13 10.20/13
Cooling method Air-cooled Air-cooled/Water-cooled
Discharge temperature Air-cooled: ambient temperature +810oC / Water-cooled: 40oC and below
Oil capacity L 15 22 24 48 56
Noise level dB(A 68±3 70±3 72±3
Transmission V-belt Gear driven/
Direct coupled
Motor Power  kW 22 30 37 45 55 75
Voltage/Frequency 200240V   380480V  060Hz
Dimensions L mm 2050 2450 2750 2900
W mm 1400 1550 1650 1500
H mm 1850 1850 1950 1950
Weight kg 1050 1350 1500 1700 2400(2320) 3150(3050)
Discharge pipe connections inch/mm 1-1/4" 2"
Cooling water pipe connections inch/mm 1"

Notes: 
(1) Measured and tested in accordance with ISO1217, 3rd Edition, Annex C (1996). 
(2) Noise level measured in accordance with Pneurop/Cagi PN8NTC test code, error 3dB(A). 
(3) Cooling system specifications are given in brackets. 
(4) Adekom may make improvements and/or changes in the appearance and/or specifications without notice. 
Please contact local dealer or manufacturer for more detailed information.


Model KE90ET(INV) KE110ET(INV) KE132ET(INV) KF160ET(INV) KF185ET(INV) KF220ET(INV) KF250ET(INV) KG315ET(INV)
Discharge capacity /Discharge pressure m³/min /bar(g) 16.20/8 20.48/8 23.50/8 27.80/8 31.00/8 37.77/8 43.95/8 54.28/8
14.00/10 17.50/10 21.00/10 25.00/10 28.10/10 33.77/10 38.50/10 51.34/10
12.10/13 14.85/13 18.38/13 21.50/13 25.00/13 29.98/13 33.00/13 45.62/13
Cooling method Air-cooled/Water-cooled Water-cooled
Discharge temperature Air-cooled: ambient temperature +810oC / Water-cooled: 40oC and below
Oil capacity L 65 80 160 200 250
Noise level dB(A 72±3 75±3 78±3
Transmission Gear driven/Direct coupled
Motor Power  kW 90 110 132 160 185 220 250 315
Voltage/Frequency 380480V  060Hz
Dimensions L mm 3550 3550 3850 4900(4750) 5350
W mm 1800 1900 1900 2250 2250
H mm 2100 2150 2150 2250 2250
Weight kg 3350(3250) 3600(3450) 4300(4150) 4600(4450) 5430(5280) 6700(6500) 7000(6800) 9900
Discharge pipe connections mm DN80 DN100 DN125
Cooling water pipe connections mm DN40 DN50 DN65


Notes: 
(1) Measured and tested in accordance with ISO1217, 3rd Edition, Annex C (1996). 
(2) Noise level measured in accordance with Pneurop/Cagi PN8NTC test code, error 3dB(A). 
(3) Cooling system specifications are given in brackets. 
(4) Adekom may make improvements and/or changes in the appearance and/or specifications without notice. 
Please contact local dealer or manufacturer for more detailed information.