Explosion-protected electric motors - Hew-hf.de
Explosion-protected electric motors - Hew-hf.de
Explosion-protected electric motors - Hew-hf.de
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Three-phase A.C. <strong>motors</strong><br />
Construction types<br />
The construction types of <strong>electric</strong> <strong>motors</strong> and their symbols comply with the standards EN 60034-7. Our <strong>motors</strong> are available in basic<br />
construction types IM B3, IM B5 and IM B14.<br />
The table shows the symbols and the installation options of the standard mo<strong>de</strong>ls we manufacture. The type IM B3 <strong>motors</strong> can also be<br />
operated in the mounting positions IM B6, IM B7 and IM B8. As well as the flange sizes allocated in line with the standard, a number<br />
of other flange sizes can also be supplied (see page 1/11). On all construction types with the shaft end at the bottom the version "with<br />
safety cover" must be selected in or<strong>de</strong>r to prevent foreign bodies from falling in.<br />
IP protection classes<br />
The protection classes of circulating <strong>electric</strong> machines are <strong>de</strong>noted by an abbreviation in line with EN 60034-5. It consists of the<br />
letter IP (international protection) and two numbers.<br />
1st number ( 0 to 6 ): Protection level for contact and foreign body protection.<br />
2nd number ( 0 to 8 ): Protection level for water protection.<br />
The <strong>motors</strong> are constructed with protection class IP 55. Motors can be supplied with a higher protection class on request.<br />
Protection from solids and liquids: IP protection class<br />
Protection class Protection from contact and the penetration of solid substances (first number)<br />
IP 55 / IP 56 Full protection from contact with live and moving internal parts.<br />
Protection from penetration from dust.<br />
The penetration of dust is not completely prevented but cannot take on such a scale as to have a<br />
negative effect on operation of the machine.<br />
IP 65* Complete protection from contact with live or moving internal parts.<br />
Penetration of dust is fully prevented.<br />
Protection class Protection from penetration of water (second number)<br />
IP 55 / IP65* The motor is <strong>protected</strong> from jets of water from all directions.<br />
IP56 Machine <strong>protected</strong> from heavy seas.<br />
Water from heavy seas or a strong jet of water must not penetrate into the housing in damaging<br />
quantities.<br />
* All vertically installed <strong>motors</strong> with an open shaft end at the top must be <strong>protected</strong> in such a way that no foreign objects can fall into<br />
the fan cover from above. However, this protection is not necessary if the machine is fitted with such a protective mechanism itself.<br />
Motors installed in the open must be <strong>protected</strong> from direct sunlight.<br />
HEW DEx series<br />
1/9<br />
1