ISO-7284-1993.pdf
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1、INTERNATIONAL STANDARD IS0 7284 Second edition 1993-07-I 5 Resistance welding equipment - Particular specifications applicable to transformers with two separate secondary windings for multi-spot welding, as used in the automobile industry Ma tkriel de soudage par rksistance - Sptkifica tions particu
2、lihres applicables aux transformateurs B deux enroulements secondaires s WY - 1 -!T- I -mm- -A 140max Rotary!switch I 50 T -. 9) .I depth 18 I Rotary switch positions 2 to 5 Rotary switch position 1 Figure 2 - Dimensions and arrangement of secondary connections 3 Copyright International Organization
3、 for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:14:54 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7284: 1993(E) Dimensions in millimetres L140max., L w 184 4 Allowance where necessary N
4、OTE - All sizes are overall, including any allowance necessary for primary inputs, see 7.4.2. Figure 3 - Dimensions of the separate rotary switch (position 6) - Position of the handle 7 Construction 7.1 Secondary connections The arrangement and dimensions of the secondary connections shall be as sho
5、wn in figure 2 and as given in table2. 7.2 Cooling water circuit The cooling water circuit shall ensure effective cooling of the transformer for a nominal water flow of 4 I/min and the incoming cooling water shall be at a maximum temperature of 30 “Cl). It shall be leakproof at a pressure of 10 bar*
6、). For the said water flow, the pressure drop shall be not more than 0,6 bar. 7.3 Rotary switch 7.3.1 The rotary switch has five steps of which four are active and one is a zero step. The rotary switch shall be designed so as to a) allow rapid transition from one step to another; b) allow positive p
7、ositioning at each step; c) block direct transition from step 4 to step 0. 7.3.2 The direction of rotation for voltage increase shall be clockwise. I) Value in accordance with IS0 5826. 2) 1 bar=lOOkPa;l Pa=1 N/m* 7.3.3 The torque necessary for switch rotation shall not be greater than 6 N-m. The le
8、ngth of the lever shall be approximately 80 mm. 7.3.4 The cover of the switch shall be so designed that the control lever is protected and so that an ac- cumulation of liquid which could leak into the trans- former is avoided. 7.3.5 The rotary switch shall hold any position indi- cated in clause 5 e
9、qually well. 7.4 Primary connections 7.4.1 Cables and terminals Cables used for primary connections and terminals shall be appropriate to the primary current which can flow and shall be in accordance with the requirements of the relevant IEC Publications. 7.4.2 Cable input For the transformers, the
10、cable input into the trans- former and the rotary switch shall be planned in ac- cordance with one of the methods given in annex A. The position of the threaded holes for the cable input into the transformer shall be as shown in figure2. 7.5 No-load current The value of the no-load current shall not
11、 be greater than the values given in table3. 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:14:54 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7284
12、:1993(E) 8 Tests c) the position of the rotary switch (see clause 5). If there is no rotary switch, 0 shall be noted for Transformers covered by this International Standard transformers without controls and 7 for transfor- shall be tested in accordance with the requirements mers with control of the
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