psl Posted March 27, 2007 Report Share Posted March 27, 2007 two 5.5kW air-conditioners start at the same time and draw 45amps for about 2 seconds and then stabilize at 13amps, due to this high start-up current the generator trips, im forced to buy a 12kva generator instead of a 8kva generator. problem with my business is i have to buy many 12kva generators and the price difference between 8kva and 12kva is very big. how can i solve this tripping problem? Link to comment Share on other sites More sharing options...
AB2005 Posted March 27, 2007 Report Share Posted March 27, 2007 It depends on the starting torque requirement of your compressor. These types of compressors start and stop through a pressure control switch. The compressor motor is under load when switch starts the motor for filling the air tank during automatic operation. I think your motor is started through DOL starter. You can use a Star Delta starter which would reduce the current at 1/3rd limit and also reduce the torque. Check, may be your problem would solve. "Don't assume any thing, always check/ask and clear yourself". Link to comment Share on other sites More sharing options...
kens Posted March 27, 2007 Report Share Posted March 27, 2007 Hi psl, the first thing that leaps to mind is to control the system so that the individual compressors do not start at the same time. However there may be a good reason for not doing this. Could you provide a little more detail? What is your voltage and no of phases. It seems to me that you have 2 single phase systems each with a cooling output of 5.5kW and an input of around 2.5 kW, is this correct? If they are single phase units the options are reduced. Ken An expert is one who knows more and more about less and less until he knows absolutely everything about nothing Link to comment Share on other sites More sharing options...
marke Posted March 27, 2007 Report Share Posted March 27, 2007 Hello psl Welcome to the forum. Firstly, in order to provide you with a meaningful answer, we need to have more information. What are the voltage, current, frequency and power ratings of the motors in the airconditioners? Are they single phase or three phase? If the motors are single phase, are they capacitor start or induction start? Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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