ELGi CONSERVE drives match output with demand by varying motor speed, the power consumption reduces in line with the reduction in demand. This helps in eliminating the frequent load-unload cycle and also the wasted power from the energy bill. A fixed speed compressor operates on a load-unload band of at least 10 PSI around the working pressure whereas with ELGi VFD, compressor can be operated within a band of 2 PSI. Since compressors are not operated under higher than working pressure requirements, there is a substantial saving of 1% power saving for every 2 PSI reduction in operating pressure. In a fixed speed compressor with star-delta starter, starting current is as high as three times the full load current(FLC). With ELGi VFD starting, starting current is as equal to the full load current (FLC). This helps to avoid using heavy rated components like fuses, MCCB, cable size, generator rating, isolators etc. For compressed air systems with fluctuating demand pattern, return on investment due to power saving will be less than 12 months.
Keywords
FLC
MCCB
line
fuses
output
return
10 PSI
ELGi VFD
12 months
isolators
investment
cable size
energy bill
compressors
1% power saving
2 PSI reduction
starting current
load-unload band
generator rating
full load current
power consumption
star-delta starter
operating pressure
substantial saving
varying motor speed
ELGi CONSERVE drives
fixed speed compressor
compressed air systems
heavy rated components
fluctuating demand pattern
frequent load-unload cycle
working pressure requirements
