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Atmospheric protection index ( W ) : A machine is said to be weather protected when its construction reduces the penetration of rain, snow and airborne particles to a value compatible with the correct running of the machine. This degree of protection is shown by the letter W inserted between IP and the index numbers. The conditions and severity of the tests must be subjected to a specific agreement between the manufacturer and the end user. Anti-C The
heating of the winding can be done either by providing the Anti-Condensation
heaters or by directly heating the stator by injecting the direct current into
two of the phase wires in series from a D.C.
Voltage source. Anti-Condensation
heaters are provided only 112 frame and above. The details of the power
requirements are given below.
Note : The anti-condensation heaters need 240 V , 50 Hz, Single phase supply.
However, heaters suitable for 110 V supply can be provided on request. The
heaters must be switched off while the motor is in operation. |