User Manual
Contents
1. to use 3 3 The comparison of linear BEC and switch mode BEC When using a lithium battery pack more than 3S a switch mode BEC has much higher efficiency than linear BEC For a traditional linear BEC For example a 4S lithium battery pack has a typical voltage of 14 8V in order to let BEC output 5V 1A the current flow into the BEC is at least 1A so the power on BEC is 14 8V 1A 14 8W But the useful output power is only 5V 1A 5W so the efficiency of the linear mode BEC is just 5W 14 8W 33 8 the redundant power 14 8W 5W 9 8W changes to heat which makes the BEC very hot For aswitch mode BEC in the above case in order to let BEC output 5V 1A the current flow into BEC is only 0 38A actual test data so the power on BEC is 14 8V 0 38A 5 6W and the efficiency of BEC is 5W 5 6W 89 3 3 4 3 5 4 2 4 3 HW SM810ENG 20120607 Don t worry about the polarity of battery pack If the polarity is not correct the UBEC can t work but it will not be destroyed What you need to do is just swap the battery pack polarity A shield covers almost all the electronic components on PCB and a ferrite ring is attached with the output wires to decrease the electromagnetic interference How to use UBEC Important hint Switch mode UBEC may cause some electromagnetic interference to receiver Please install the UBEC with a distance at least 5cm away from the receiver When ESC HAS NOT built in BEC No change is needed for the ESC j2. User Manual of 3A UBEC 3 Amp Switch Mode UBEC 1 Why do you need UBEC The UBEC is a switch mode DC regulator separated from ESC ESC Electronic Speed Controller for brushless brushed motor it will take high voltage 5 5V to 26V power from your battery pack and convert it to a consistent safe voltage for your receiver gyro and Servos For traditional speed controller with a built in BEC it will very likely have only a limited ability to supply power to your receiver and servos without overheating If you are using a high voltage battery pack or have heavy servo load you should consult the ESC specifications to determine what the stated recommendations or limitations are In general if you are using a 4 cells lithium battery pack or more than a 12 cells Nickel based battery pack you should consider using an UBEC because in such a case the built in BEC of the ESC can support only 2 servos which means it is not suitable for RC helicopter and big aircraft 2 Specification 2 1 Output 5V 3A and 6V 3A switchable 2 2 Ripple lt b5OmVp p 2A 12V 2 3 Input 5 5V 26V 2 to 6 cells Lipo battery pack 5 to 18 cells NIMH battery pack 2 4 Size 51mm 16 6mm 8 5mm length width height 2 5 Weight 11 59 3 Features 3 1 The UBEC is an advanced switching regulator with over current and over heat protection function and the maximum efficiency of the system is nearly 90 3 2 The small size and the light weight make it very convenient
3. ust connect the input cables of UBEC with the battery and plug the output cable connector of the UBEC into one spare channel of the receiver The color of trio wires white red black from top to bottom red Battery ae i ESC Pack black a Receiver UBEC When ESC HAS built in BEC You must disable the built in BEC of the ESC that is you need to cut the red wire in the trio of Rx receiver wires Simply use a pair of wire cutters to remove a short section of the red wire near the receiver connector and insulate the cut wire with a bit of electrical tape Cut the red wire in the trio of receiver wires TT da Receiver UBEC Suggestion You can use a sharp screwdriver to take the pin with red wire out from the BEC connector of the ESC and then insulate it with a bit of electrical tape for further use so you needn t cut the red wire by this method Battery Pack Take the pin with red wire out
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