NORD Drivesystems B2050 - Manual (Page 30)

4. Commissioning
-30- B2050-GB-0613 www.nord.com
4.5 Operation with back stop
Optional backstops, which allow rotation in only one direction and block the other direction of
rotation are available for attachment to the gearbox. The lubrication of the backstop is by means
of the gear oil. The backstops lift off due to centrifugal force above a certain lifting speed n1 (see
table 4-1) and are then free of wear.
Danger!
In continuous operation, back stops may only be operated at above the lift-off speed.
Figure 4-2: Industrial gear unit with back stop
Gear units Stages i
N
Lift-off speed n
1
[min
-1
]
SK 112 07 2 5,6 - 20 320
SK 113 07 3
31,5 - 112 400
22,4 - 28 320
SK 114 07 3 12,6 - 71 1136
SK 115 07 4
112 - 400 1420
80 - 100 1136
SK 122 07 2 5,6 - 20 250
SK 123 07 3 22,4 - 112 320
SK 124 07 3 12,6 - 71 888
SK 125 07 4 80 - 400 1136
SK 132 07 2 5,6 - 20 250
SK 133 07 3 22,4 - 112 320
SK 134 07 3 12,6 - 71 888
SK 135 07 4 80 - 400 1136
SK 152 07 2 5,6 - 20 220
SK 153 07 3 22,4 - 112 250
SK 154 07 3 12,6 - 71 781
SK 155 07 4 80 - 400 888
Table 4-1: Lift-off speeds for back stops