Rongge

Control cable length Q) How do I calculate the critical length on control cable for contactor? The permissible length of cable (m) can also be calculated by using the formula below: U : Rated coil voltage dU : Voltage drop ( 5%) Son : Coil VA / W at pick up Cos φon : p.f of coil at pick up R: Ohmic resistance/cable values as tabulated When long control cables are used for actuating the contactor, large voltage drop may occur causing chattering of the contactor or even failure to pick up. If the length of the cable exceeds L, use of higher size of cable or use of contactor relay is suggested as shown in fig. ..

USB cable consists of 4 wires plus a conductor wire wrapping, such as the protectors are usually found in the audio cable. Cable number 1 is used to channel resources to the voltage of 5 volts, if necessary USB devices may draw power from this line and should not exceed 100 mA. Computer equipped with USB capability, is required to provide power at 100 mA for this purpose. USB devices that require more power than the aforementioned provisions, must provide their own resources for the purposes work equipment. The USB cable signals Number 4 is the ground cable as a back channel source voltage of 5 volts. Cable number 2 and number 3 is used for signal transmission. No. 2 cable and cable called D-3 numbers called D, the voltage on the two channels is changed between 0 Volt and 3.3 Volt. Digital signal is sent through the two channels are said to be 'difference signal', which means that the signal digital '0 'or '1' is not declared to the magnitude of the voltage on ...