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Technical description
3.4 Backstop K2X, K3X
NOTICE
Damage or destruction due to incorrect direction of rotation
Do not run the motor against the backstop.
Note the directional arrow on the motor.
Note
The backstop is not suitable for ambient temperatures under ‑25 °C.
The gearbox can be fitted with a mechanical backstop in the coupling adapter. The backstop
permits only the correct direction of rotation during operation. The adapter is indicated by an
arrow pointing in the corresponding direction.
The backstop is fitted with centrifugally operated sprags. When the gearbox is running in the
specified direction, the inner ring and the cage with the sprags also rotate while the outer ring
remains stationary.
If the drive speed exceeds the speed listed in the table, the sprag rises. The backstop is wear-free.
Table 3-1
Size
K2X - IEC
80
90
100, 112
132
160
180
200
225, 250
24
Minimum drive speed when using backstops
K3X - NEMA
56
140
180
210
250
280
-
320, 360
SIMOGEAR adapters for gearboxes - KS, K2, K3, K4, K5, KQ, KQS, K8, A, AZ
Backstop
FXN46-25DX
FXN51-25DX
FXN76-25DX
FXN101-25/DX
Operating Instructions, 05/2022, A5E37431501A/RS-AL
Speed
rpm
> 890
> 860
> 860
> 750
> 730
> 670
> 670
> 630
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