BA 5814 en 09/2014
The speedmonitoring device must be connected in such a manner that the main drive is disabled
automatically at
"> Zero"
speed at the output shaft of the auxiliary drive. For safety reasons, the disabling
function must be checked at regular intervals, i.e. at least quarterly. To check the disabling function, the
auxiliary drive unit is switched on. If the speedmonitoring device connects which can be verified, for
instance, by means of a warning light the speedmonitoring device is ready for operation.
This speedmonitoring device is an absolute must for safety reasons since in case of
a defect in the overrunning system the auxiliary drive unit can be destroyed with
explosive effect due to overspeeds.
5.11.2
Overrunning clutch
If the gear unit is fitted with an auxiliary drive unit in addition to the main drive, coupling is realized by an
overrunning clutch. This allows, when driving by the auxiliary drive unit, a torque transmission in one
direction of rotation, while there is
"freewheeling operation"
when driven by the main drive.
The output shaft of the main drive will rotate in the same direction of rotation both if the drive is effected via
the main motor and via the auxiliary drive.
The overrunning clutch is fitted in an adapter flange and integrated in the oil circuit of the gear unit.
Maintenance and oil change take place simultaneously with maintenance and oil change of the main drive.
The overrunning clutch is provided with centrifugally operated grippers. If the main gear unit is rotating in
the specified direction of rotation, the inner ring will rotate together with the grippers, while the outer ring
remains stationary. From a certain speed of rotation, the grippers will lift off and the overrunning clutch will
operate without wear. If the drive is effected by the motor of the auxiliary drive unit via the outer ring, the
overrunning clutch will be in
"carrier operation",
i.e. the main gear unit is turned over slowly in the chosen
direction of rotation. At the same time, the drive shaft of the main gear unit and, if a flexible coupling is used
between main motor and gear unit, possibly the main motor will rotate slowly along with it.
The main motor and the motor of the auxiliary drive unit should be interlocked electrically in
such a manner that only one of the two motors can be switched on.
When driving via the auxiliary drive unit, the drive shaft of the main gear unit will rotate along
simultaneously. This rotary motion
must not be impeded
. A brake arranged on the drive side
in the main drive must be released if the drive is effected via the auxiliary drive.
When filling the main gear unit with oil, start by supplying lubricating point 1 at the
intermediate flange with the oil quantity and oil grade specified on the rating plate.
