There is a difference in running cost between the 2 technologies. The belt driven unit is less expensive investment but consumes in average 3% extra energy. Also a little bit more time has to be put to maintenance, by adjusting for example the belt. The most suitable technology depends on the customer.
Depending on the models. For the active range from 30 to 110 kW the transformer can be ordered as an option => when this option is fitted, there is no need for a separate power supply. On future ranges it will most likely be an std option.
The included documentation at delivery is the local certificates: Europe for example the CE documentation, for North America the UL/cUL, ASME. If you are missing your certificate at delivery you can download it on the MBP > Aftermarket > Service Connect. Then write the serial number of the unit in the open field and press search.
Because an inverter/frequency driven compressor is not producing more air than needed. A conventional compressor works within a pressure band. When reaching the higher pressure the machine goes into unload mode (the motor is running but no air is produced). When reaching the lower pressure value the compressor starts to build up pressure again until it reaches its unload pressure again. An inverter/frequency driven compressor has less unload time and works towards a set pressure value, this makes the inverter compressors in general 30% more energy efficient than a conventional load/unload compressor.
It has almost the same components as a conventional compressor but there is, of course, a few main differences. A frequency driven compressor has an integrated inverter and often a more advanced control system. The inverter adjusts the motor speed to the actual air demand. This is controlled by a sensor that measures the system pressure this is signaled to the controller of the compressor. The controller registers the pressure and sends a signal to the inverter which regulates how much air the compressor needs to produce in order to keep the set pressure.
First, an internal Water Separator Drain ( inside of the compressor ) is NOT necessary. But it can have some benefits in two cases: 1. Screw without an integrated dryer: Using a water separator drain, we remove some water from the compressed air, before its delivered to the final area of use with less water content. 2. Screw with an integrated dryer: Using it before the dryer, some of the water gets removed before the dryer, this gives the opportunity to choose a smaller sized air dryer.
All compressor rooms require ventilation. Minimum room ventilation can be calculated form the formula: Qv = 1.06 N / T for Pack unit Qv = (1.06 N + 1.3) / T for Full-Feature unit Qv = required cooling air flow (m³/s) N = shaft input of compressor (kW) T = temperature increase in compressor room. (usually 7 °C) If the compressor is conducted, the required ventilation is the same as the fan capacity of the compressor. This is mentioned in the instruction manual.