2013-08 / 04 Catalogue LM1 - 008 UK Page 4 Edition - Speed controller Downstream of the differential pressure oiler, the centrifugal force speed controller is provided mechanically connected to the rotors, it reduces the supply air in correspondence with an increase in speed, thus allowing for precise regulation of the idle speed. In an accurately manufactured bushing installed radially and centrally in the speed controller housing, two pistons are arranged to the left and to the right of the centre and retained in this position by compression springs. With increase or reduction of speed, the pistons are moved by the centrifugal force against the spring force, opening or closing air gaps provided in the regulator bushing that discharge into the interior of the control housing. - Control slide (5/3-way valve) Downstream of the speed controller, there is a manually operated 5/3-way slide with spring return in centre position. In centre position, connection P is locked, and the motor connections A and B are connected to the exhaust. In control version MP, the manual lever is overridden by an integrated pneumatic cylinder that specifies the sense of rotation when pressure is applied to control connections 3/4 and that goes into centre position when pressure relief with spring return is applied. To ensure fast retraction, install a quick-action vent valve at each of 3/4. - Rotors From the control slide, the working air is supplied to the motor rotors and sets them in motion in the sense of rotation, left or right, set at the control slide. The two pressurized, spur-toothed, tempered, and ground rotors are mounted in a cast metal housing. The rotor with the mounted drive shaft can be installed either in top or bottom position. Thus, there are two possible distances between the axis and the mounting feet. The working pressure applied to the rotors can be tapped from the measuring connections MA and MB and used as control pressure for brakes and clutch couplings. - Exhaust air After power output, the exhaust air flows in part through pre-flow slots and in part over the control slide through the exhaust channel of the double chamber motor housing into the open. This double chamber motor housing is designed to act as a silencer. - Silencer (KS) It is possible to bolt a box silencer adapted to the motor design to the exhaust air connection to reduce the noise by approx. 10 dB(A). - Integrated spur gear unit (FST2 and FST3) A spur-toothed, one-stage spur gear unit FST2 (i=1,92 / 2.0) and FST3 (i=2.75 / 2.80) adapted to the motor design may be attached. - After consultation with the customer, external brakes / gear units may be mounted downstream. Description / Function
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