Renova PWX Series Quick guide

powder brake PWX
Assembly and maintenance manual
ITA

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© Copyright Renova Srl, 2013. All rights reserved.

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english - index
introduction .…………………………………………………………….…….… page 4
warnings …….…………………………………………………….…….…….….. page 4
assistance ………………………………………………..………....……………. page 4
description …………………………………………………..……………………. page 5
power supply ALPWX ………………………………………..………………. page 6
assembly procedures …………………………………………………………. page 7
assembly and overall dimension tables ..……..…………………….. page 8
costructiveness and functioning ..………………..…………………….. page 10
replacement of electromagnetic powder ..…………………………. page 11
technical datas and graphics ....…………………..……………………… page 13
warranty ..……………………..……………….…………….…..………………. page 15
index of manual revision …………....…………….…..………………….. page 16

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introduction
The following manual is intended for installers and users of the product and provides descriptions
and explanations on the PWX powder brakes (installation and maintenance) and on all its parts
and / or options that can be supplied by Renova.
Inside you will find:
- Instructions for the correct installation of the PWX brake, and relative maintenance
- Description of the possible versions of the PWX brake with relative dimensions and dimensions
- Technical data and related tables
Since the product and Renova itself are constantly evolving in order to improve the quality and
performance of its products, Renova reserves the right to update the manuals to new versions,
without the obligation to update products already marketed and / or any previous manuals.
warnings
CAREFULLY READ THE INSTRUCTIONS AND WARNINGS IN THIS MANUAL AND KEEP THEM FOR
FURTHER REFERENCE FOR THE ENTIRE LIFE OF THE PRODUCT. IN THIS MANUAL ARE
IMPORTANT INSTRUCTIONS RELATING TO OPERATIONS AND SAFETY FOR THE INSTALLATION,
USE AND MAINTENANCE OF THE PRODUCT.
WE STRONGLY RECOMMEND ASSEMBLY OF THE DEVICE BY QUALIFIED TECHNICAL PERSONNEL
IN ORDER TO AVOID ANY RISK OF DAMAGE TO PEOPLE, THINGS OR THE PRODUCT ITSELF.
IN THE EVENT OF ANY BREAKAGE OF THE PRODUCT, THE OPERATOR SHOULD BE AWARE OF
THIS MANUAL AND THE INFORMATION INSIDE IT, KNOWING AND KNOWING TO AVOID ANY
RISKS AND / OR DANGERS, BEFORE ANY INTERVENTION BY OUR TECHNICIAN.
assistance
Renova is present all over the world with its agents and distributors.
To contact the Renova support service write to:
[email protected]

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description
The PWX series electromagnetic powder brakes guarantee perfect torque adjustment and stability
over a wide speed range. The torque is produced by a special magnetic powder whose viscosity
varies according to the magnetic field generated by modulating the coil supply current. This
functional feature allows to design transmissions in which it is possible to easily adjust and
program the braking (brake) or drag (clutch) torque according to the user's needs and in a wide
range of use, from the minimum residual torque value: Mr (residual torque Mr <= 1% Mn), up to
the rated torque Mn of the brake/clutch (see Table). These clutches (brakes) can work with
continuous slip at precise defined and stable torque values, determined by the level of
electromagnetic excitation, provided that the heat dissipation is acceptable within the range
specified in the table divided by size and version.
In order to transfer the torque, therefore, a slipping condition is not necessary between the
brake/clutch input and output elements and, if the required torque does not exceed the maximum
torque for which the brake is powered, a torque transmission with rotation will occur.
synchronous between the brake / clutch input and output elements. Conversely, if the torque load
exceeds the excitation torque level, the slip will occur in an absolutely regular way, transmitting
only the set torque value. For all working modes, the static and dynamic torque coefficients are
practically identical. The output torque is independent of the speed or slip speed. The
characteristics of the powder are not sensitive to the increase in temperature in the workplace
and the clutch always has the characteristic that the torque transferred is directly proportional to
the supply current.
To adjust the braking torque Renova recommends using the ALPWX-5A module. The set torque is
maintained with an accuracy of 5%, regardless of the number of revolutions or slippage between
the brake body and the rotor. The operating rpm range is as follows:
50 - 3.000 [min-1] for brakes,
50 - 1.500 [min-1] for clutches.
ATTENTION: For clutches and brakes to work properly, their axis of rotation must
be horizontal.