Table 3-2 Machine Version With Type Of Protection Ex Ec Or Ex Na - Siemens SIMOTICS HV M Operating Instructions Manual

Electric motor

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Description

See also

Quality documents (Page 127)

Additionally, the following standards apply to these explosion-protected machines:

Table 3-2

Characteristic

Type of protection Ex ec (previously Ex nA)

Rating plate

The rating plate shows the identification data and the most important technical data. The data

on the rating plate and the contractual agreements define the limits of proper usage.

Rotor

The rotor is designed as a squirrel-cage rotor. The number and design of the shaft extensions

are shown and described in the technical data.

Cooling

The cooling system is designed as a closed, internal cooling circuit. The mounted cooler is an

air-to-water heat exchanger with a pipe system. The heat lost from the machine is dissipated

via the surface of the cooling pipes to the cooling liquid flowing in the pipes. External fans

facilitate the circulation of the cooling air in the primary circuit.

External fan

The machine is fitted with an external fan. For IC 666, there are two external fans. The electrical

connection data are stamped on the rating plate of the external fan.

Supplementary devices

Temperature sensors are integrated in the stator winding to monitor the winding temperature.

Various supplementary devices can be integrated or mounted, depending on the order. These

include, for example, anti-condensation heating to prevent condensation or temperature

sensors for monitoring bearings.

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