1、STD-RWMA BULL 5-ENGL 1995 m 7b98558 00008Lib OLA m ation of the RES I STAN CE MANUFACTURERS? B Resistance We1 d i n g Control Standard I? - STD-RWMA BULL 5-ENGL 1995 W 7b98558 0000847 T54 RWMA BULLETIN 5 Resistance Welding Control Standards STD*RWMA BULL 5-ENGL 1995 W 7b98558 0000848 990 W RESISTANC
2、E WELDER MANUFACTURERS ASSOCIATION FORWORD This RWMA standard represents the result of many years of research, investigation and experience by the members of RWMA. The have been developed through continuing consultation among manufacturers, users and national engineering societies and have resulted
3、in improved serviceability of our products with economies to manufacturers and users. One of the primary purposes of this RWMA standard is to encourage the production of reliable Resistance Welding equipment which, in itself, functions in accordance with this standards. Some portions of this standar
4、d, such as spacings, interrupting ratings and application specific sensing circuits, have a direct bearing on safety: almost all of the items in this standard, when applied properly, contribute to safety in one way or another. Properly constructed Resistance Welding equipment is, however, only one f
5、actor in minimizing the hazards which may be associated with the use of electrical and mechanical equipment. The reduction of hazard involves the joint efforts of the various equipment manufacturers, the system designer, the installer and the user. Information is provided herein to assist users and
6、others in the proper selection of control equipment. This publication is dedicated in the memory of John Hurley. John did not survive to see the completion of this standard, however, he strongly supported the effort in the early stages and was able to guide all of us in the right direction. Disclaim
7、er “This standard was originally issued by the National Electrical Manufacturers Association (“NEMA“) as a voluntary industry standard, denominated ICs 5 (1979). Use of ICs 5 is subject to applicable copyright laws of the United States. NEMA no longer reviews or updates this Standard, and in no way
8、represents that it is technically adequate for the purposes indicated or that it will satisfy appropriate safety concerns.“ RWMA-CVR.SAM RWMAFWRD.SAM STD-RUMA BULL 5-ENGL 1995 m 7b985S8 00008Li9 827 BULLETIN 5 Table of Contents BUL 5-001 Definition of terms and Timing Diagrams 1 BUL 5-002 General St
9、andards . i3 BUL 5-003 Terminal Markings and Connections . 17 BUL 5-004 Enclosure Features For Resistance Welding Controls 25 BUL 5-005 Welding Contactors 27 BUL 5-006 Microprocessor Controls BUL 5-008 Frequency Converters 39 BUL 5-015 Safety Standards . 31 41 BUL 5-016 Three Phase . Direct Current
10、55 BUL 5-017 High Frequency . Direct Current . 57 rwmatoc.sarn October 1995 STD-RWMA BULL 5-ENGL 1775 7b98558 0000850 5q9 W RESISTANCE WELDER MANUFACTURERS ASSOCIATION DEFINITIONS OF TERMS AND TIMING DIAGRAMS Page 1 October 1995 BULLETIN 5-001 DEFINITIONS OF TERMS AND TIMING DIAGRAMS The standards i
11、n this patt apply fo all other parts of this publication unless ofhenvise specified. The definitions and standards of NEMA Standards Publication No. /CS 1 apply to this patt unless otherwise specified. Alternate Polarity Operation - the mode Of operation made with pulses of the Anti-Tie-Down, Anti-R
12、epeat - See BUL 5-01 5.65.04 (b) Automatic Power Factor - A control function that automatically adjusts the phase shift of the welding contactor to maintain the linear percent heat regardless of secondary load impedance. Automatic Voltage Compensation (AVC) - Automatic voltage compensation is a cont
13、rol function which maintains a specific value of RMS voltage on the transformer primary over a specified range of line voltages. Background Heat - Background heat is a welding function that provides a lower uniform welding current between successive heat functions in seam welding. Can also be known
14、as interheat, high low heat, heat during cool, or idle current. See Fig. 7. Beat 1995 1 Valve Group Control Outputs) svc Solenoid Valve Common (all) sv1 first Solenoid Valve output sv2 second Solenoid Valve outDut RVC RVI Power outputs for additional valves with SVC as Common t sv3 sv4 sv5 SV6 SV# s
15、vc Retraction Valve Common Retraction Valve output Accessory Group (Control Outputs) FVC svc Forge Valve Common FVI Forge Valve output FTC SVC or FLTC Major Fault Common FT1 FLT? Major Fault output MTC MT2 ALT1 Minor Fault output SVC or ALTC Minor Fault Common (e.g.: End of Stepper) I I EHC I svc I
16、End of Hold Common I ISOLATION CONTACTOR GROUP (Control Outputs) (Control Inputs) II Il EH1 End of Hold output STC svc Shunt Trip Common STI Shunt Trip output OUTC OUT# - OUTW additional Output Common for specific applications Additional Outputs for specific applications (# symbol indicates output n
17、umber) MCC svc Isolation (Mechanical) Contactor Common MCI Isolation (Mechanical) Contactor output MC# MW Ax1 Ax2 Ax#-Ax# Outputs for additional Isolation (Mechanical) Contactors. Auxiliary contacts for isolation contactors. additional Auxiliary contacts for isolation contactors. _ STD-RWMA BULL 5-E
18、NGL 1995 = 7b98558 000087L 273 Page 22 RESISTANCE WELDER MANUFACTURERS ASSOCIATION TERMINAL MARKINGS AND CONNECTIONS / EXAMPLE INPUT/OUTPUT TERMINAL STRIP Init. Schedule #i Init. Schedule #2 lnit. Schedule #3 Init. Schedule #4 Emergency Stop Weld / No Weld Pressure Switch Input #e Input #9 Gun Valve
19、 #i Gun Valve #Z Fault End of Hold output #5 Output #S ASSUME 24vac INPUTS AND l2Ovac OUTPUTS EXTERNAL WIRING INTERNAL WIRING OF WELD CONTROL NWC NW1 2 PS 1 LO IN8 IN9 12OVAC x1 1 - I 24VAC X1A x2 -. - -1 I L“L Control Transformer Weld Control Input Weld Control Output STD-RWMA BULL 5-ENGL 1795 W 7b
20、98558 0000872 1DT RESISTANCE WELDER MANUFACTURERS ASSOCIATION TERMINAL MARKINGS AND CONNECTIONS Page 23 BUL 5-003.04 SOLENOID VALVE SCHEMATIC DIAGRAMS Obsolete, will be removed with next revision. BUL 5-003.05 FORGE VALVE SCHEMATIC DIAGRAMS Obsolete, will be removed with next revision BUL 5-003.06 R
21、ETRACTION VALVE SCHEMATIC DIAGRAMS Obsolete, will be removed with next revision BUL 5-003.07 NO-WELD SWITCH CONNECTIONS Terminals can be provided for connection of no-weld switch (NWI and NWC). A jumper shalt be connected between these terminals with the shipment of new control having these terminal
22、s. When utilizing a external No-Weld switch, remove jumper and connect the switch leads between these terminals. BUL 5-003.08 PRESSURE SWITCH CONNECTIONS Terminals can be provided for connections of the pressure switch (PSI and PSC). A jumper shall be connected between these terminals with the shipm
23、ent of a new control having these terminals. When utilizing the pressure switch, remove the jumper and connect the pressure switch leads between these terminals. BUL 5-003.10 EMERGENCY STOP SWITCH CONNECTIONS Terminals can be provided for connection of the emergency stop switch (ES1 and ESC). A jump
24、er shall be connected between these terminals with the shipment of a new control having these terminals. When utilizing the external Emergency Stop Switch, remove the jumper and connect the switch leads between these terminals. STD-RWMA BULL 5-ENGL 1775 7b78558 0000873 Oib M Page 24 RESISTANCE WELDE
25、R MANUFACTURERS ASSOCIATION TERMINAL MARKINGS AND CONNECTIONS 6911 575 12/25/94 STD-RWMA BULL 5-ENGL 1995 7b98558 000087q T82 W RESISTANCE WELDER MANUFACTURERS ASSOCIATION ENCLOSURE FEATURES FOR RESISTANCE WELDING CONTROLS Page 25 October 1995 l I LETIN 5-0 4 ENCLOSURE FEATURES F8k RESISTARCE WELDIN
26、G CONTROLS The standards in this part ap Iy to all other arts of this Standards Publication unless otherwise specified. The enclosure definitions, eneral information, types, design tests, construction, and related information, see NEMA Standards Publication 40. /CS 6. definitions and standards of Ni
27、MA Standards B ublication No. ICs 1 apply to this part unless otherwise specified. For BUL 5-004.80 .o1 .o2 .O3 .O4 .O5 .O6 .O7 ENCLOSURES FOR TIMER COMBINATIONS (See Fig. 1) Type of Enclosure - NEMA Type 1 , 4, 12 or appropriate for end use shall be provided. Combination units shall be mechanically
28、 joined and electrically interconnected. See figure 1 for general types of cabinets. Location of Adjustments - Obsolete, will be removed with next revision. Securing Means - Parts of enclosures such as doors, covers, tanks, etc., shall be provided with means for firmly securing them in place. Doors
29、and access panels shall have provisions for locking or shall be interlocked. A door or access panel shall be considered locked if a key, wrench or other instrument is required to open it. Doors shall swing a minimum of 90 degrees. All parts of door fasteners shall remain captive when the door is ope
30、ned. Cabinet doors with circuit breakers are be interlocked with a flange mounted or rotary operator. Refer to Safety Section 15.63 of this specification. Multiple door cabinets must be electrically or mechanically interlocked to the main door. Water Connections - A minimum of 3/8 NPT female pipe fi
31、ttings or hose barbs shall be provided for water connections to contactors of up to 2500A. Water fittings shall be of conductive, noncorrosive material. Space for bulkhead water connections shall. be provided near the bottom of the cabinet below any active power components. Bulkhead Water connection
32、s shall be conductive and non-corrosive, electrically and mechanically bonded to the cabinet. Enclosure Dimensions for Control Combinations - Obsolete, will be removed with next revision Provision of Drainage - Drainage holes shall provide a total area of at least 1/2 square inch opening in the bott
33、om of the contactor section. Mechanical Barrier - Obsolete, will be removed with next revision. TYPICAL CABINETS TYPES Bench Style Portable Gun Style Wall Mount Style Floor Mount Style Multi-Contactor Style Figure 1 STD*RWMA BULL 5-ENGL 1775 H 7678558 0000875 719 Page 26 RESISTANCE WELDER MANUFACTURERS ASSOCIATION ENCLOSURE FEATURES FOR RESISTANCE WELDING CONTROLS 47/306 12/25/94
