Working conditions
Humidity: The electrical equipment must be able to work with a relative
humidity between 30 and 95% (without condensation). Damaging effects of
occasional condensation must be avoided by adequate equipment design or, if
necessary, by additional measures
(for example, built-in heating device, drainage holes). The winding are vacuum
pressure impregnated (VPI process, evaporation free, medium category), and
are therefore suitable for tropical climates
Altitude and temperature: the powers indicated are intended for regular use
at altitudes below 1000 mt above sea level and a temperature between -15°C and 40°C (IEC 34-1): For
higher altitude and/or temperature the power decreases of 10% each 10°C of higher temperature, and of
8% for each 1000 mt of higher altitude. It is not allowed to use motors designed for explosive
atmospheres in environment temperatures out of -20°C and +40°C range.
Voltage - Frequency: The maximum variation of the supply voltage is +-10%. Within this tolerance
Motive motors supply the rated power. Within such range, the temperature rise of the motor can fluctuate
up to +/-20°C
Insulation: the stator winding is made of resin coated copper wire and insulation materials in F class, that
provide high protection against electrical and mechanical stresses.
The max temperatures (Tmax) for insulation classes defined by EN 60034-1 standard are
Class
∆T (°C)
Tmax (°C)
A 60+5° 105
E 75+5° 120
B 80+5° 130
F 105+5° 155
H 125 180
The temperature rise of the Delphi series is class B or lower, much under the limits of F class motors,
thus permitting a longer motor life
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General