Hi eeprom,
Yes Direct on line with 3 phase motors with single winding with number of poles to be active during high / low speed mode
Guys I am Mechanical Engineer not sure about all the controls and codes.I think better to contact control specialist locally.
Hi waross
There are 110 Nos fans...
Scenario;
In tunnel we are installing truly reversible axial smoke exhaust 2-speed fans (1450/750) with 5.5/1.1 kW to run on day to day ventilation (low speed) and to run during fire mode ( high speed).
But DOL is recommended by manufacturer because when the fan goes in to high speed fire mode...
