Technical data

MHD Sychronous motors Notes Application 16-3
DOK-MOTOR*-MHD********-PR05-EN-P
16.2 Protection class
The type of protection is defined by the identification symbol IP
(International Protection) and two code numbers specifying the degree of
protection.
The first code number defines the degree of protection against contact
and penetration of foreign particles. The second code number defines
the degree of protection against water.
First char-
acteristic
numeral
Degree of protection
6
Protection against penetration of dust (dust-proof);
complete shock protection
4
Protection against penetration of solid foreign particles, more
than 1 mm in diameter
2
Protection against penetration of solid foreign particles, more
than 12 mm in diameter
⇒ Keep away fingers or similar objects!
Second
charac-
teristic
numeral
Degree of protection
7
Protection against harmful effects if temporarily immersed in
water
5
Protection against a water jet from a nozzle directed against
the housing from all directions (jet water)
4
Protection against water splashing against the housing from
all directions (splashwater)
Fig. 16-4: IP proctection class
Tests regarding the second characteristic numeral must be
performed using fresh water. If cleaning is effected using high pressure
and/or solvents, coolants, or penetrating oils, it might be necessary to
select a higher degree of protection.
The design of the MHD motors complies with the following degrees of
protection according to DIN VDE 0470, Part 1, ed. 11/1992 (EN 60 529):
Motor range Protection
class
Remark
Motor housing, output shaft, power
and encoder connectors (if
mounted properly only)
Approx. IP
67
If fitted with the
optional sealing air
connection
Motor housing, output shaft, power
and feedback connectors (if
mounted properly only)
IP 65 Standard design
Blower motor IP 44 Standard design
Surface-cooling (blower grille) and
blower connection
IP 24 Standard design
Fig. 16-5: Ranges of IP degrees of protection for the motors