Wirewound Rheostats and Potentiometers Graded Windings, Ganged Assemblies

Transcription

1 Wirewound Rheostats and Potentiometers raded Windings, anged Assemblies FEATURES Duo, trio or quattro configurations DATA REQUIRED TO DEFINE A UNIT a: Ohmic value of the current load in series with the rheostat b: Supply voltage of the rheostat + series load c: Ohmic value of rheostat d: Maximum current when the rheostat is in short circuit position e: Current when the rheostat is set to maximum ohmic value f: Resistance variation law as a function of mechanical travel To define a graded winding unit a, b and c; or c, d and e or g has to be established. APPLICATION EXAMPLES Potentiometer mode The following data has to be established: - Potentiometer supply voltage U - Ohmic value of the controlled current load Note If the power to be controlled is small, a linear, variation law rheostat can be used U Ohmic value: R = -- and 2 I = ; in such case the output current is 5 Control of lamps The parameters to be established are: - Light flux variation required: Linear from 100 % to 1 % log variation from 100 % to 4 % or from 100 % to 20 % - Lamp supply voltage - Lamp power range I 6U = RHEOSTATS AND POTENTIOMETERS WITH RADED WINDIN: RTS max. current When the ration exceeds 2, a graded unit may min. current min. current enable a smaller sized unit to be used than an equivalent linear law unit for the same maximum current. raded windings can also avoid the use of twin units. Linear relationships are achievable between the variable parameters being controlled and the rheostat command shaft. All RT size rheostats are available with graded windings except the RT12 size. The resistive wire is protected by a specially formulated enamel. Mechanical and environmental characteristics are identical to the RT series. ANED ASSEMBLIES Rheostats may be ganged mechanically in the following styles: 2 ganged units DUO 3 ganged units TRIO 4 ganged units QUATTRO The RT12 unit is not suitable for ganged assembly. anged assemblies may comprise: - Similar sized units, where the ohmic values may be different - Various sized units where the unit at the top end of the command shaft can be of smaller size COMMAND SYSTEM All units with common command: Code CU Shaft locking devices as an option: Code DBA (factory assembled) Concentric shafts: Code CC Available for double ganged units only: DUO The shaft locking device and double mini switch cannot be fitted to concentric shaft Command knobs as an option: Code JF for standard shaft, code JFP - FSP for concentric shafts SPECIAL FEATURES For any special features such as graded windings, centertappings, etc. We would be pleased to receive the details of your particular requirements. Revision: 08-Aug-13 1 Document Number: THIS DOCUMENT IS SUBJECT TO CHANE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

2 DIMENSIONS in millimeters FEATURES Mechanical, electrical, and environmental features are similar to the RT series document numbers, 50024, 50025, 50026, 50027, 50028, 50029, F K Connection DIMENSIONS SERIES TYPE A B C D E F H J Ø H H Duo M FRT Trio M TRIO C MRT Quattro M QUARTO 5 Notes Duo 2 ganged units Trio 3 ganged units Quattro 4 ganged units C C MRT PANEL CUT-OUT E PANEL CUT-OUT DUO - TRIO - QUATTRO B Mounting Plane A + 2 CRT PANEL CUT-OUT J P D Type L M Ø N M5 7 7 CONCENTRIC SHAFT (1) SERIES TYPE Ø P Ø Q R S Duo Note (1) 2 ganged units only Ø 12 CONCENTRIC SHAFT S Ø N M ØQ Ø P L R Revision: 08-Aug-13 2 Document Number: THIS DOCUMENT IS SUBJECT TO CHANE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

3 ELECTRICAL DIARAM (typical use) Single rheostat connected Single potentiometer connected Double potentiometer series connected, load in parallel Triple rheostat series connected Double rheostat parallel connected, load in series Double potentiometer parallel connected, load in series Triple rheostat connected, used for three phase current regulator Double bridge Double potentiometer parallel connected, load in parallel Triple potentiometer connected, used for three phase current regulator MARKIN raded winding units: RTS trademark, series, style, number of graded, windings, ohmic value (in or k), tolerance (in %), maximum current (in A), manufacturing date anged units: : Duo, Trio, Quattro trademark, series, style, the relative position of each unit in the assembly. CRT 1 st unit (command knob end), MRT 2 nd and/or 3 rd unit, FRT last unit, ohmic value (in or k), tolerance (in %), maximum current (in A), manufacturing date Revision: 08-Aug-13 3 Document Number: THIS DOCUMENT IS SUBJECT TO CHANE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

4 ORDERIN INFORMATION DUO 25 CU 2 x 7 10 % e SERIES TYPE STYLE COMMAND SHAFT OHMIC VALUE TOLERANCE LEAD (Pb)-FREE Trio Quattro Common Shaft CU Concentric Shaft CC LOBAL PART NUMBER INFORMATION T R T C U K LOBAL MODEL DRT (duo) TRT (trio) QRT (quattro) SIE COMMAND SHAFT OHMIC VALUE TOLERANCE PACKAIN SPECIAL CU = Common shaft CC = Concentric shaft The first three digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point = 20 k 4700 = R0 = = 100 K = 10 % B = Box BO1 As applicable Ex.: DXxx Revision: 08-Aug-13 4 Document Number: THIS DOCUMENT IS SUBJECT TO CHANE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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