nord 6052902/0213, Manual With Installation Instructions

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Industrial gear units – Manual with installation instructions
68 B 1050 en-3921
4.11 Backstop/Auxiliary drive (Option: R, WX)
NOTICE!
Gear unit damage through overheating
• The auxiliary drive must be secured or monitored to prevent it from idling.
• Operation below the lift-off speed according to the following tables results in a considerable
reduction of the service life of the back stop bearing.
A back stop prevents running in a particular direction of rotation.
An auxiliary drive enables the gear unit to be run at a low speed, e.g. for maintenance work. In normal
operation a freewheeling coupling disconnects the auxiliary drive from the gear unit.
The back stop and the freewheeling coupling are lubricated by the gear unit oil.
The back stop or the freewheeling coupling lift off due to centrifugal force above a certain lift-off speed
n
1
(see Table 8 and Table 9). For this, the auxiliary drive must be at a standstill. The freewheeling
coupling is monitored by a speed sensor. There is increased wear if the necessary lift-off speed is not
reached. The service life of the back stop or freewheeling coupling is reduced. To minimise wear and
generation of heat, back stops or freewheeling couplings in continuous operation should only be
operated above the lift-off speed.
Information
Before commissioning, note the information and specifications of the back stop or freewheeling
coupling in the specific documentation for the order.
Adhesive labels on the gear unit indicate the direction of rotation of the back stop and the freewheeling
coupling. The direction of rotation can be obtained from the specific dimension sheet for the order.
Information
Incorrect oil level indication due to trapped air for Option WX with installation position M5/M6
During commissioning and after changing the oil, air (air pockets) may become trapped in the gear unit
oil bath. These disappear during operation. The resulting space fills with lubricant. Because of this the
oil level may deviate in comparison with the initial filling. Trapped air can escape via the gear unit
venting. This process may take several days. During this period an incorrect display of the oil level
cannot be ruled out.
• Check the oil level at regular intervals, especially after changing the oil or commissioning.