Supplementary installation, operating and maintenance instructions English
Explosion-proof three-phase asynchronous motors with squirrel-cage rotor for high voltage
815001 Edition 09.2020
9
Tightening torques for screws on terminal box, bearing plates and bearing cover
Thread Ø
M8
M10
M12
M16
M20
M24
Load blocks
-
-
-
150
250
400
Bearing plates
25
45
75
170
275
-
Bearing cover
15
20
20
-
-
-
Terminal box
7.5
12.5
-
20
-
-
Terminal board circuits
In standard design, the surface-cooled motors are suitable for both directions of rotation. An excep-
tion is the 2-pole types. They are equipped as standard with a fan with a specific direction of rotation.
When using fans with a specific direction of rotation, a direction of rotation arrow is provided on the
fan guard.
The terminals U1, V1, W1 on phases L1, L2, L3 (in alphabetical or natural sequence) always result in clock-
wise rotation. The direction of rotation can be reversed for direct switch-on by swapping two mains conduc-
tors on the motor terminal plate. For a machine with only one shaft end or two shaft ends of different thick-
ness, the direction of rotation is the direction of rotation of the rotor that an observer sees when looking at the
front of the single or thicker shaft end.
Each motor is supplied with a binding terminal diagram according to which the connections
must be made. The auxiliary circuits must be connected according to the additional terminal
diagram also enclosed.
1.8 Operation
Vibration severities in the range “satisfactory” (V
eff
≤ 4.5 mm/s) according to ISO 10816-1 are not a cause for
concern in coupled operation. If there are changes compared to normal operation, e.g. increased tempera-
tures, noises and vibrations, the machine must be switched off in case of doubt.
The cause must be determined and the manufacturer consulted if necessary. Protective devices must not be
disabled even in test runs.
The closed condensation water drain holes provided must be opened from time to time. Roller bearings with
relubricating devices must be regreased when the high-voltage machine is running. The lubrication infor-
mation on the rating plate must be observed.
1.9 Environmental factors
The permissible coolant temperature (room temperature at the installation site) according to IEC/EN 60034-1
is a maximum of 40°C/minimum -20°C without marking and the permissible installation altitude is up to
1000 m above sea level (other values are indicated on the motor rating plate and certified separately, as nec-
essary). It must be ensured that the cooling air can flow freely into the air inlet openings and out through the
air outlet openings and cannot be drawn in again directly.
Suction and discharge openings must be protected against contamination and coarse dust. Direct intake of
exhaust air from neighbouring units must be prevented by suitable measures.
The minimum distance between the air inlet on the fan guard and an obstacle (dimension Bl) must be observed.
Prevent foreign bodies and liquid from falling vertically into the fan for motors with vertical shaft position as
follows:
Shaft end down:
The fan guard is provided with a protective roof (delivery condition) which is larger than the circumference of
the air inlet openings.
Alternatively, the operator must take suitable measures to prevent foreign bodies and water from falling into
the fan
Size
Bl [mm]
355
110
400
110
450
110
