Siemens SIMODRIVE 611A Installation And Planning Manual page 202

2.1 Definitions
General information on AC servomotors
AL S
Bearing design
Shaft end
AL S/2-4
Degree of protection:
Motors with separately–driven fan fulfill, acc. to EN 60529, degree of protection
IP 64. The IP 65 or IP 67 option cannot be fulfilled if a separately–driven fan is
used.
The motor– and shaft height specific version and a description of how the sepa-
rately–driven fan is connected, is described in the special motor chapters.
The following features regarding non–ventilated motors remain unchanged:
Encoder system
Holding brake
Type of construction, flange dimensions
Vibration– and shock stressing
Vibration characteristics
Moments of inertia
Natural torsion– and shaft bending frequencies
Bearing design
The bearings are sealed on both sides and are permanently lubricated. The
bearings are designed for operation at a minimum ambient temperature of –15
C.
The specific versions can be taken from the motor data.
Note
We recommend that the bearings are replaced after approx. 20 000 operating
hours, however, at the latest after 5 years.
Table 2-3 Differences in the various cylindrical shaft ends
Characteristics
Keyway and key (DIN 6885)
Force–locked
Friction–locked, smooth shaft (e.g.
shrink connection, clamping sets etc.)
No play
Favorable for reversing operation and
fast acceleration
Standard for the motors
Optional for the motors
Dimensions, refer to the dimension drawings in the specific motor chap-
ters!
Siemens AG 1997 All Rights reserved
DIN 748 DIN 748
Shaft end with key Shaft end without
(Type a) keyway (Type b)
X
X
1FT5 1FT6 and 1FK6
1FT6 and 1FK6
6SN1197–0AA20
SIMODRIVE 611 (PJ)
01.98
08.95
X
X
X
1FT5