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USER'S MANUAL
No. 990-083
Revision D: January 2002
DIRECT ENERGY WELDING CONTROL
PHASEMASTER™ 6
MODEL NUMBER
PM6
PM6/115
PM6/230
PM6/100
PM6/460
SCHEDULE
SQUEEZE
NUMBER POLARITY
CYCLES
RUN
PROGRAM
HEAD
TYPE
MANUAL
AIR
FOOTSWITCH
1 LEVEL
2 LEVEL
STOCK NUMBER
1-237-XX
1-237-XX-01
1-237-XX-02
1-237-XX-03
1-238-XX
WELD
HOLD
CYCLES
CYCLES
SAVE
PHASEMASTER
AC WELDING CONTROL
FOOTSWITCH
WELD ABORT
ON
OFF
ALARM
SCR
MACHINE
% CURRENT
TM
6
WELD
NO WELD
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Table of Contents
Summary of Contents for Unitek Peco PHASEMASTER 6
- Page 1 USER'S MANUAL No. 990-083 Revision D: January 2002 PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL MODEL NUMBER STOCK NUMBER 1-237-XX PM6/115 1-237-XX-01 PM6/230 1-237-XX-02 PM6/100 1-237-XX-03 PM6/460 1-238-XX SCHEDULE SQUEEZE WELD HOLD NUMBER POLARITY % CURRENT CYCLES CYCLES CYCLES PROGRAM SAVE PHASEMASTER AC WELDING CONTROL HEAD...
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Page 2: Revision Record
Revision Record Revision Date Basis of Revision 16289 4/96 Correct illustration callouts. 17415 4/98 Correct machine alarm condition A4. 17521 6/98 Incorporated errata. 19161 10/01 1. Change name to Unitek Peco™. 2. Update manual. PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL 990-083... -
Page 3: Foreword
The purpose of this manual is to supply operating and maintenance personnel with the information needed to properly and safely operate and maintain the Unitek Peco Phasemaster™ 6 .Direct Energy Welding Control. We have made every effort to ensure that the information in this manual is accurate and adequate. -
Page 4: Safety Notes
SAFETY NOTES This instruction manual describes how to operate, maintain and service the Phasemaster™ 6 .Direct Energy Welding Control, and provides instructions relating to its SAFE use. A separate manual provides similar information for the Weld Head used in conjunction with the Power Supply. Procedures described in these manuals MUST be performed, as detailed, by QUALIFIED and TRAINED personnel. -
Page 5: Table Of Contents
CONTENTS Revision Record........................Foreword ........................Safety Notes ........................Declaration of Conformity................... Following Contents CHAPTER 1: DESCRIPTION .................... Section I. Features ......................Features........................Process Definitions....................... Sequence Welding Function................... Weld Schedule....................... Remote Weld Schedule Selection................Run State....................... Program State......................Section II. Major Components ..................Front Panel Description.................... - Page 6 PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL 990-083...
- Page 7 CHAPTER 3: OPERATING INSTRUCTIONS ..............Section I. Operation......................Power Up ......................Select Run or Program State .................. Select Schedule...................... Change Schedule Parameters ................. Change Parameters for Schedules 1 through 7 ............Copying Information in Schedule 0 to Another Schedule ......... Alarms ........................
- Page 8 Evaluate Results......................3-20 Electrode Maintenance....................3-20 CHAPTER 4: MAINTENANCE ..................Modification and Calibration..................Cover Removal...................... Line Voltage Modification..................Calibration Check......................Check Weld/No Weld Switch................Half Cycle Symmetry..................... Line Count......................Memory Initialization....................Repair Service ......................Telephone Service....................Factory Service Repair................... APPENDIX A: TECHNICAL SPECIFICATIONS............. Section I.
- Page 9 A-15 ILLUSTRATIONS Figure Title Page Sequence Welding Function................... Phasemaster 6 Front Panel..................Phasemaster 6 Rear Panel..................Terminal Connection Examples................Examples of Cable Routings ................... Typical Set-up diagram for the PM6 showing both Manually Actuated and Air Actuated Weld Head connections................
- Page 10 Location of Footswitch Weld Abort Jumper on the Input/Output Board ....Typical Set-up diagram for the PM6 showing connections used in Automated Systems ......................... Remote Heating Schedule Selection via a BCD Coded Digital Thumbwheel Switch......................Measuring Preset Firing Force of the Weld Head with a Force Gauge ..... 3-10 A Graphic Presentation of the Effects of % CURRENT, Time and Pressure on the Weld........................
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Page 12: Chapter 1: Description
RFI and EMI environments. The PM6 includes power input and output cables and connectors for easy installation with a Unitek Peco Welding Transformer. It is a multi- voltage unit designed for operation at 100, 115, 208, or 230 VAC, 50/60 Hz. These models are supplied with a line cord, suitable connector, and a 30 amp combined circuit breaker/power switch. -
Page 13: Process Definitions
CHAPTER 1: DESCRIPTION Process Definitions Sequence Welding Function Sequence Welding Function is a term used by the industry to describe this basic welding function. Sequence Welding, illustrated in figure 1-1, provides the solution for the majority of resistance welding applications. This function is designed for air actuated weld heads but can also be used with manually actuated heads. -
Page 14: Run State
CHAPTER 1: DESCRIPTION Run State In this State, the PM6 is ready to make a weld. If it is not executing a weld schedule, it is waiting for either: The Footswitch to close (Air Actuated Weld Head); or b The Force Firing Switch to close (Manually Actuated Weld Head). The user can select, but not change, any weld schedule by using the Keys on the Front Panel. -
Page 15: Section Ii. Major Components
WELD FOOTSWITCH ALARM 1 LEVEL NO WELD 2 LEVEL MACHINE Figure 1-2. Phasemaster 6 Front Panel KEY/ SWITCH DESCRIPTION WELD/ Welding current will not flow when this switch is in the NO WELD position, however NO WELD the control will actuate the weld head and execute the welding sequence (Squeeze, Weld and Hold). -
Page 16: Indicators And Displays
SQUEEZE time can be set from 0 to 99 cycles in 1 cycle increments. Since all Unitek Peco Weld Heads are "force fired", Squeeze time is usually set to 0. - Page 17 CHAPTER 1: DESCRIPTION %CURRENT - Indicates the percentage of the maximum current which will flow during each half-cycle of the Weld Period. %CURRENT can be set from 20 to 99% in 1% steps. Welding quality will improve if %CURRENT is set between 65% and 85%. HEAD TYPE - Indicates whether an Air or Manual Head is connected to the PM6.
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Page 18: Rear Panel
Footswitches are only used with air or electrically actuated weld heads. AIR VALVE DRIVER - Provides either 24 or 115 volts (AC) to Unitek Peco Air Actuated Weld Heads. Model VDAC24P (10-304-01) adapter is used to connect standard 115V plugs. -
Page 19: Chapter 2: Getting Started
CHAPTER 2 GETTING STARTED Section I. Planning for Installation Location Install the power supply in a well- ventilated area that is free from dirt and moisture. Allow sufficient clearance around the sides and rear of the unit so that cooling air may flow properly. Position the PM6 as close as practical to the weld head. - Page 20 CHAPTER 2: GETTING STARTED that the secondary loop does not encompass magnetic materials (steel) and/or is not encompassed by any magnetic material. See figure 2-2. Tape cables together to minimize the inductive losses. A separation of weld cables surrounding an area of one square foot could result in losses of up to 65% (figure 2-1). Note: Attach both welding cables on the same side of the weld head.
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Page 21: Output Cable
Firing Switch closure is required for the PM6 to fire. Firing Switch Unitek Peco weld heads and handpieces are force fired and have firing switch cables which can be connected directly to the mating FIRING SWITCH CABLE located on the rear panel of the PM6. -
Page 22: Installing Air Actuated Weld Heads
Air Actuated Weld Head connections Installing Air Actuated Weld Heads Solenoid valve/regulator assemblies which are separate from the weld head, such as the Unitek Peco Models 80, 81, 82, or 88, should be mounted at a convenient location on the bench. -
Page 23: Air Valve Driver
Air Head has been connected. Users of Air Actuated Weld Heads which are not manufactured by Unitek Peco should connect the air solenoid valve on the head, or regulator valve assembly, to the appropriate 24 volt or 115 volt pins of the valve driver receptacle on the rear of the PM6. -
Page 24: Footswitch
Footswitch Connect either a 1-Level or 2-Level Footswitch to the FOOTSWITCH receptacle located on the rear panel. The PM6 will automatically recognize which type Unitek Peco Footswitch has been connected. 1-Level Footswitch When the operator fully depresses the 1-Level Footswitch, the PM6 will energize the air valve on the weld head. -
Page 25: Replace Cover
CHAPTER 2: GETTING STARTED With a Manual Head, Footswitch Weld Abort will always be ON regardless of the position of the Jumper on the Input/Output Board. This means that if the operator releases the Footpedal during the welding sequence, the sequence will abruptly abort (terminate). It is necessary to remove the outside cover to change the Footswitch Weld Abort Option. -
Page 26: External Inputs Connections
CHAPTER 2: GETTING STARTED 230 VAC, 30A 50/60 Hz, 1Ø (BLK) (WHT) (GRN) WELD HEAD +5VDC POWER OPTICAL FIRING FIRING FORCE SWITCH SWITCH FIRING SWITCH (SEE NOTE 1) (SEE NOTE 1) Welding OUTPUT ELECTRODES Control WELD CABLES 24VAC WELD (SEE NOTE 2) 24/115 TRANSFORMER VALVE... - Page 27 CHAPTER 2: GETTING STARTED To use REMOTE SCHEDULE SELECTION, connect three control lines from a user supplied, normally open contact to the EXTERNAL INPUTS connector, Pins 1, 2, and 3. Schedules are selected by shorting across Pins 6, 7, 8, or 9 and the appropriate pins coded to the BCD (binary coded decimal) pattern shown in table 2-1 and figure 2-7.
- Page 28 CHAPTER 2: GETTING STARTED To use the REMOTE WELD INHIBIT Feature, connect one wire from the normally open contacts of a user supplied switch to Pin 4 of the EXTERNAL INPUTS connector. The second wire can be connected to Pins 6, 7, 8, or 9. To use the EMERGENCY STOP Feature, connect one wire from the normally open contacts of a user supplied switch to Pin 5 of the EXTERNAL INPUTS connector.
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Page 29: Chapter 3: Operating Instructions
CHAPTER 3 OPERATING INSTRUCTIONS Section I: Operation Power Up Switch the rear panel Circuit Breaker to "ON". To prevent firing until ready to weld, select [NO WELD]. Set the Transformer Tap Switch to its lowest tap position, Tap 1 on UNIPULSE Transformers. Select Run or Program State The PM6 has two States, the RUN State and the PROGRAM State. - Page 30 CHAPTER 3: OPERATING INSTRUCTIONS Press [PROGRAM], one of the numeric fields should start flashing. Select the field you wish to change by using ] then use [ ] to increase or decrease the value of that field. If Polarity is selected the [ ] will change the field from + to - ? to ±.
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Page 31: Change Parameters For Schedules 1 Through 7
CHAPTER 3: OPERATING INSTRUCTIONS Change Parameters for Schedules 1 through 7 If Schedule Protection is switched to OFF, any schedule can be changed when the PM6 is placed in the PROGRAM State. Press [PROGRAM], one of the numeric fields should start flashing. Use [ ] to select the SCHEDULE NUMBER Field. -
Page 32: Copying Information In Schedule 0 To Another Schedule
CHAPTER 3: OPERATING INSTRUCTIONS Copying Information in Schedule 0 to Another Schedule Schedule 0 is unprotected, therefore it is assumed that it will be used to develop new weld schedules. After the weld schedule is tested it can be transferred, without re-keying, to another schedule, and saved in permanent memory. -
Page 33: Machine Alarm A3
CHAPTER 3: OPERATING INSTRUCTIONS Alarm A2 indicates that an Emergency Stop signal was received from the user's equipment. Operation cannot resume until the signal is removed. The error message will be displayed until the signal is removed. See Appendix A, Emergency Stop. Machine Alarm A3 Alarm A3 indicates that the Footswitch stayed closed after the welding sequence completed, preventing the PM6 from returning to the RUN State. - Page 34 CHAPTER 3: OPERATING INSTRUCTIONS PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL 990-083...
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Page 35: Schedule Protection Feature
CHAPTER 3: OPERATING INSTRUCTIONS The status of the Schedule Protection Feature is indicated by one of the following: The status of the Line Voltage Compensation Feature is indicated by one of the following: Schedule Protection Feature Weld Schedules 1 through 7 can be protected from unauthorized or inadvertent changes by switching the PM6's Schedule Protection to ON. -
Page 36: Line Voltage Compensation Feature On
CHAPTER 3: OPERATING INSTRUCTIONS Line Voltage Compensation Feature On The PM6's Automatic Line Voltage Compensation Feature can be switched to ON using the following procedure: Select [NO WELD]. b Select Schedule 0. Press [SAVE] and [ ] at the same time. d The PM6 should display: Line Voltage Compensation Feature Off The PM6's Automatic Line Voltage Compensation Feature can be switched to OFF using the following... - Page 37 CHAPTER 3: OPERATING INSTRUCTIONS PHASEMASTER™ 6 DIRECT ENERGY WELDING CONTROL 990-083...
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Page 38: Change Schedule Protection
CHAPTER 3: OPERATING INSTRUCTIONS Any time an Emergency Stop, Machine or SCR Alarm occurs, the welding sequence will abruptly abort and the valve output circuits will be de-energized causing the weld head to open. An audible alarm will sound for 5 seconds and the display will reference the cause of the Alarm. -
Page 39: Section Iii. Adjusting Weld Heads
Refer to the appropriate weld head manual for instructions on how to install the welding electrodes. Set the Force Indicator on all Unitek Peco Weld Heads to “3”. For more detailed information on setting up each specific weld head, refer to their respective manual. -
Page 40: Measuring Preset Firing Force Of The Weld Head With A Force Gauge
CHAPTER 3: OPERATING INSTRUCTIONS Figure 3-1. Measuring Preset Firing Force of the Weld Head with a Force Gauge • Press the Footswitch. The head should lower the upper electrode onto the workpiece. Adjust the pressure regulator, which controls the air pressure on the top of the air cylinder so that it is JUST SUFFICIENT to cause the Force Firing Switch in the head to close. -
Page 41: Section Iv. Developing Weld Schedules
CHAPTER 3: OPERATING INSTRUCTIONS Section IV. Developing Weld Schedules This section is a guide to be used in establishing the parameters required to make a successful weld. Careful development of a weld schedule will aid in achieving a repeatable reliable process. Resistance Welding Parameters The three basic welding parameters are Heat, Time, and Pressure which are controlled by: Parameter... -
Page 42: Weld Head Parameters
2 Set the force adjustment knob on the weld head to set the firing force. Start at a moderate force setting, 3 on a Unitek Peco Weld Head. Figure 3-2 illustrates the effect of electrode force on the work piece. -
Page 43: Welding Transformer Parameters
Welding Transformer Parameters Primary Tap and Secondary Tap: Set the Primary Tap to the #1, the lowest tap on Unitek Peco Transformers and, if appropriate, select the lowest Secondary Tap. -
Page 44: Pm6 Control Parameters
CHAPTER 3: OPERATING INSTRUCTIONS PM6 Control Parameters Weld Cycles, %Current: 1 Select Schedule 0. Weld Schedules can be developed using Schedule 0 and then they can be copied to any other Schedule Number. 2 Switch Line Voltage Compensation to OFF. See Chapter 3, Section II. 3 Set WELD CYCLES to 0.5. -
Page 45: Evaluating The Weld
CHAPTER 3: OPERATING INSTRUCTIONS Evaluating the Weld Use pliers to peel the welded materials apart. A satisfactory weld will show residual material pulled from one material to the other. Tearing of base material around the weld nugget indicates a material failure, not a weld failure. Electrode sticking and/or "spitting"... -
Page 46: Electrode Force And %Current
CHAPTER 3: OPERATING INSTRUCTIONS Electrode Force and %CURRENT The heat of resistance welding is produced, in part, by the resistance of the interface between the work pieces to the flow of electricity (the contact resistance). Sufficient electrode force is required to contain the molten material produced during the weld. However, as the force is increased, the contact resistance decreases. -
Page 47: Output Voltage Vs Weld Quality
CHAPTER 3: OPERATING INSTRUCTIONS Since polarity can be an important consideration in half-cycle welding of some material combinations, be sure to check the weld schedule results using both positive and negative polarity. Polarity can be changed in the PROGRAM State. The general rule is that the more resistive material, or the thinner material, should be placed against the negative (-) electrode. -
Page 48: Test Condition A
CHAPTER 3: OPERATING INSTRUCTIONS HEAT COOL H E A T COOL HEAT AVERAGE TEMP. COOL 3. 8 V RMS 38VRMS VOLTAGE VOLTAGE TEMP. Test Condition A: (a) Low average power is provided with a short burst of current which results in (b) large temperature deviations around the average temperature. -
Page 49: Weld Strength Profiles
CHAPTER 3: OPERATING INSTRUCTIONS Weld Strength Profiles Weld strength profiles are graphic presentations of the varying effects of %CURRENT and electrode force. To make a weld strength profile, start at an initial energy setting, make four or five welds, and perform pull tests for each weld. -
Page 50: Evaluate Results
CHAPTER 3: OPERATING INSTRUCTIONS Evaluate Results Figure 3-5 illustrates a typical Weld Strength Profile. Curve C shows the highest pull strengths but the lowest tolerance to changes in weld current. Curve B shows a small reduction in strength but considerably more tolerance to changes in weld current. -
Page 51: Chapter 4: Maintenance
CHAPTER 4 MAINTENANCE Modification and Calibration Unless you are a skilled technician, we suggest you telephone the Unitek Peco Repair Department at the telephone number shown in the Foreword of this manua l for advice before attempting calibration and/or modification. -
Page 52: Calibration Check
CHAPTER 4: MAINTENANCE Line Voltage Jumper Figure 4-1. Control Transformer inside the PM6, connected for 230V. Calibration Check To enable the Calibration Screen, perform the following procedure: • With the power OFF, select [NO WELD] • Press both [SAVE] and [RUN] •... -
Page 53: Check Weld/No Weld Switch
CHAPTER 4: MAINTENANCE After the self-test, the Calibration Screen will be displayed and all of the indicator lights should be lit. The following example shows an ideal display for the Calibration Screen. Read the following procedures and verify the calibration values for; NO WELD Switch function, Half- Cycle Symmetry, and Line Count. -
Page 54: Memory Initialization
CHAPTER 4: MAINTENANCE Press any arrow key to exit the Calibration Screen and enter the RUN State. Memory Initialization The following procedure re-sets all Schedules in memory to default values: • With the power OFF, select [NO WELD] • Press both [SAVE] and [PROGRAM] •... -
Page 55: Appendix A: Technical Specifications
APPENDIX A TECHNICAL SPECIFICATIONS Section I. Specifications Line Voltage The PM6 is a NEMA Type BS2HX Bench Type Synchronous Welding Control which is capable of operating from a single phase 100, 115, 208, or 230 VAC, 50/60 Hz power source. PM6 Controls are shipped wired for 230 VAC unless otherwise specified. -
Page 56: Schedule Protection Feature
Squeeze Time is meant to provide sufficient time for non- force fired weld heads to close and apply the required force to the workpiece. Since all Unitek Peco Weld Heads are "force fired," Squeeze Time should normally be set to 0. Occasionally Squeeze Time is used to provide time for the electrodes to (a) mechanically break through the oxides on the surface of the workpieces or (b) re- form the workpieces. -
Page 57: Automatic Line Voltage Compensation
APPENDIX A: TECHNICAL SPECIFICATIONS Weld Current Weld Current is measured as the percentage of the maximum current which could flow during each half- cycle of the Weld Period. The welding current is controlled by a Linear Current Control Circuit which proportions time so that heating effect is directly proportional to the square of the integral of the welding current. -
Page 58: Polarity Selection
Actuated Weld Head. The Front Panel MANUAL/AIR HEAD TYPE INDICATOR indicates whether a Unitek Peco Air Head is connected to the Valve Driver Connector located on the rear panel. The user can indicate the presence of a user supplied air head by jumpering Pin 4 to Pin 2 on the Valve Driver Connector. -
Page 59: Footswitch
A 1-Level or 2-Level Footswitch is required to control Air Actuated Weld Heads. The PM6 will automatically detect whether a Unitek Peco 1 or 2-Level Footswitch is connected to the Footswitch Connector located on the rear panel. The PM6 assumes that a 1-Level Footswitch is used if the input to the 2nd Level is continuously closed. -
Page 60: Footswitch Weld Abort On/Off
APPENDIX A: TECHNICAL SPECIFICATIONS Footswitch Weld Abort On/Off Footswitch Weld Abort is determined by the position of a jumper on the PM6's internal Input/Output Control Board. See Chapter 2, figure 2-5. The PM6 determines the position of this jumper when power is first applied to it and displays the result of this analysis on the FOOTSWITCH WELD ABORT Indicator located on its front panel. -
Page 61: Front Panel Switches
APPENDIX A: TECHNICAL SPECIFICATIONS Display Electrostatically shielded, 10 digit, 7 segment red LED display and one ± indicator for polarity. The following parameters are displayed during each welding sequence, Schedule Number, Pola rity (+, - ,±), Squeeze Cycles, Weld Cycles, Hold Cycles, and Weld Current (% of maximum). Squeeze Cycles and Hold Cycles are used only for Air Operated Weld Heads. -
Page 62: Input And Output Cables
Input/Output cables are 5 foot long and use Type SO, 600 volt, 3 conductor, 12AWG stranded wire. The manufacturer part number for each connector is listed, followed by the Unitek Peco part number in parentheses. The standard power connector is a NEMA L6-30P (520-1-093), 230 volt, 3 pronged, twist- lock plug rated for 250 volts, 30 amps. -
Page 63: Footswitch Connector
Located on the rear panel, is an AMP 206430-1 (550-1-062), 4-pin receptacle that mates with an AMP 206429-1 (520-1-107) plug that uses an AMP 206358-2 (245-1-084) cable clamp. Connect Pin 2 to Pin 4 on a non-Unitek Peco Air Actuated Head. The connector is wired as follows: Description... -
Page 64: Emergency Stop
APPENDIX A: TECHNICAL SPECIFICATIONS Function Remote Weld Schedule Selection, Control Line 2 Remote Weld Schedule Selection, Control Line 2 Remote Weld Schedule Selection, Control Line 2 Remote Weld Inhibit Emergency Stop 6,7,8,9 Circuit Ground Emergency Stop Emergency Stop or any other external function that should abort the welding sequence can be implemented, by the user, by continuously shorting Pin 5 to Pins 6, 7, 8, or 9 on the EXTERNAL INPUTS Connector. -
Page 65: Physical Characteristics
APPENDIX A: TECHNICAL SPECIFICATIONS Input Pin Numbers 1 (2 2 (2 3 (2 Schedule Front Panel Control * 1 = Switch Closure MICROPROCESSOR CPU: MC6805, with 4.00 MHz clock RAM: 256 bytes Random Access Memory EPROM: 4K bytes Electrically Programmable Read Only Memory EEPROM: 2K bytes Electrically Erasable Programmable Read Only Memory Physical Characteristics See figure A-1. -
Page 66: Pm6 Outline Drawing
APPENDIX A: TECHNICAL SPECIFICATIONS SCHEDULE SQUEEZE WELD HOLD POLARITY % CURRENT NUMBER CYCLES CYCLES CYCLES PROGRAM SAVE P HASEMASTER AC WELDING CONTROL HEAD FOOTSWITCH TYPE WELD ABORT MANUAL WELD FOOTSWITCH ALARM 1 LEVEL NO WELD 2 LEVEL MACHINE Figure A-1. PM6 Outline Drawing PHASEMASTER™... -
Page 67: Section Ii. Unipulse Transformer Specifications And Features
APPENDIX A: TECHNICAL SPECIFICATIONS Section II. UNIPULSE Transformer Specifications and Features UNIPULSE Transformer designs guarantee repeatable output energy even during half-cycle operation. They are convection cooled. However, their performance and duty cycle can be increased by optional fan cooling. The four models shown in figure A-2 include a primary tap switch. The red pilot lamp on the front of the UNIPULSE Transformer lights when voltage is applied to the transformer primary. -
Page 68: Transformer Physical Characteristics
APPENDIX A: TECHNICAL SPECIFICATIONS TRANS.WPG TRANS.WPG Figure A-6. Unipulse Welding Transformers Figure A-2. Unipulse Welding Transformers Transformer Physical Characteristics Characteristic X5/115HV Height (in/cm) 6.5 / 16.5 8.3 / 21.1 13.0 / 33.0 13.0 / 33.0 Width (in/cm) 6.5 / 16.5 6.6 / 16.8 7.0 / 17.8 7.5 / 19.1... -
Page 69: Forced Air Option
APPENDIX A: TECHNICAL SPECIFICATIONS Forced Air Option UNIPULSE Transformers can be modified for fan cooling. A four inch muffin or box type fan, which includes a filter and grill, can be mounted on top of the transformer. The corne r screws for the fan assembly can be inserted through the slotted louvers.
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