Miyachi 875DP User manual

USER'S MANUAL 990-290
Revision D November 2013
875DP/500DP/500HV DUAL PULSE
STORED ENERGY RESISTANCE WELDING
POWER SUPPLIES
Model Stock No. Model Stock No.
875DP 1-253-XX 875DPS 1-257-XX
875DP/208 1-253-XX-01 875DPS/208 1-257-XX-01
875DP/230 1-253-XX-02 875DPS/230 1-257-XX-02
875DP/100 1-253-XX-03 875DPS/100 1-257-XX-03
500DP 1-251-XX 500DPS 1-255-XX
500DP/208 1-251-XX-01 500DPS/208 1-255-XX-01
500DP/230 1-251-XX-02 500DPS/230 1-255-XX-02
500DP/100 1-251-XX-03 500DPS/100 1-255-XX-03
500HV 1-252-XX 500HVS 1-256-XX
500HV/208 1-252-XX-01 500HVS/208 1-256-XX-01
500HV/230 1-252-XX-02 500HVS/230 1-256-XX-02
500HV/100 1-252-XX-03 500HVS/100 1-256-XX-03
Units with the built-in Weld Sentry Option also require User's Manual No. 990-
291.

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
ii 990-290
Copyright © 1998, 2002, 2013 Miyachi America Corporation
The engineering designs, drawings and data contained herein are the proprietary work of
Miyachi America Corporation and may not be reproduced, copied, exhibited or otherwise
used without the written authorization of Miyachi America Corporation.
Printed in the United States of America.
Revision Record
Revision EO Date Basis of Revision
A 17280 12/19/97
1. Correct/clarify calibration procedures.
2. Add operating features.
B 17678 11/3/98
Specify output load for HV500 Models.
C 18578 11/14/00
1. Add Declaration of Conformity.
2. Add tolerance to pulse output voltage.
3. Clarify operation of relay outputs.
D 19146 01/02
1. Add Unitek Peco™ name
2. Update manual
E 42840 11/13 Update to Miyachi America name and logo.

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 iii
FOREWORD
Thank you for purchasing a Unitek Peco™ 875DP/500DP/500HV Dual Pulse Resistance Welding
Power Supply.
Upon receipt of your equipment, please thoroughly inspect it for shipping damage prior to its
installation. Should there be any damage, please immediately contact the shipping company to file a
claim, and notify Miyachi America Corporation at:
Miyachi America
1820 South Myrtle Avenue
P. O. Box 5039
Monrovia, California 91016
Phone: [phone]
FAX: [phone]
E-mail: [email protected]
The purpose of this manual is to supply operating and maintenance personnel with the information
needed to properly and safely operate and maintain the 875DP/500DP/500HV Dual Pulse Resistance
Welding Power Supply.
We have made every effort to ensure that the information in this manual is accurate and adequate.
Should questions arise, or if you have suggestions for improvement of this manual, please contact us at
the above location/numbers.
Miyachi America Corporation is not responsible for any loss due to improper use of this product.

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
iv 990-290
SAFETY NOTES
This instruction manual describes how to operate, maintain and service the 875DP/500DP/500HV Dual
Pulse Resistance Welding Power Supply, and provides instructions relating to its SAFE use. Procedures
described in this manual MUST be performed, as detailed, by QUALIFIED and TRAINED personnel.
For SAFETY, and to effectively take advantage of the full capabilities of the tester, please read these
instruction manuals before attempting to use the workstation.
Procedures other than those described in this manual or not performed as prescribed in it, may expose
personnel to electrical hazards.
After reading this manual, retain it for future reference when any questions arise regarding the proper
and SAFE operation of the tester.
Please note the following conventions used in this manual:
WARNING: Comments marked this way warn the reader of actions which, if not followed, might
result in immediate death or serious injury.
CAUTION: Comments marked this way warn the reader of actions which, if not followed, might result
in either damage to the equipment, or injury to the individual if subject to long-term exposure to the
indicated hazard.

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 v
CONTENTS
Revision Record..................................................................................................................... ii
Foreword ........................................................................................................................ iii
Safety Notes ........................................................................................................................ iv
Declaration of Conformity..................................................................................................... following
x
CHAPTER 1: SYSTEM DESCRIPTION
Applications ..................................................................................................................... 1-1
Features ........................................................................................................................ 1-2
CHAPTER 2: INSTALLATION
Location ........................................................................................................................ 2-1
Power Line ....................................................................................................................... 2-1
Welding Cables................................................................................................................ 2-1
Rear Panel Components................................................................................................... 2-3
Firing Switch Connections............................................................................................... 2-4
Mechanical Firing Switch .......................................................................................... 2-4
Optical Firing Switch................................................................................................. 2-4
3 Wire Firing Switches .............................................................................................. 2-4
Air Actuated Weld Head Connections............................................................................. 2-5
Air Valve Driver ........................................................................................................ 2-6
Non Unitek Peco Air Actuated Weld Heads.............................................................. 2-7
Air Actuated Weld Heads without Force Firing Switches......................................... 2-7
Second Air Head ........................................................................................................ 2-7
Footswitch........................................................................................................................ 2-7
1-Level Footswitch .................................................................................................... 2-7
2-Level Footswitch .................................................................................................... 2-8
Remote Schedule Selection........................................................................................ 2-8
Relay Outputs................................................................................................................... 2-8
Interconnection Diagram ................................................................................................. 2-9
CHAPTER 3: OPERATING CONTROLS AND SCREENS
Operating Controls........................................................................................................... 3-1
Screen Formats................................................................................................................. 3-3
CHAPTER 4: GETTING STARTED
Powering Up .................................................................................................................... 4-1
Adjusting an Air Actuated Weld Head ............................................................................ 4-1

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
vi 990-290
CHAPTER 5: OPERATING INSTRUCTIONS
Successful Welding.......................................................................................................... 5-1
Resistance Welding Parameters....................................................................................... 5-1
Weld Schedule Development........................................................................................... 5-1
Weld Head Parameters............................................................................................... 5-2
Power Supply Parameters .......................................................................................... 5-5
Making a Weld................................................................................................................. 5-5
Evaluating the Weld......................................................................................................... 5-6
Weak Weld................................................................................................................. 5-6
Electrode Sticking...................................................................................................... 5-6
Causes of Imperfect Welds .............................................................................................. 5-6
Electrode Force and %Energy ................................................................................... 5-7
Polarity....................................................................................................................... 5-7
Weld Strength Profiles..................................................................................................... 5-8
Destructive Testing .......................................................................................................... 5-8
Electrode Maintenance..................................................................................................... 5-9
CHAPTER 6: PROCESS DEFINITIONS AND WELD FUNCTIONS
Power Supply States ........................................................................................................ 6-1
RUN State .................................................................................................................. 6-1
STANDBY State........................................................................................................ 6-2
PROGRAM State....................................................................................................... 6-2
MENU State............................................................................................................... 6-3
HELP State................................................................................................................. 6-4
NO WELD State ........................................................................................................ 6-4
FIRE State.................................................................................................................. 6-4
Weld Function Field ........................................................................................................ 6-4
Basic Function ........................................................................................................... 6-5
Repeat Function ......................................................................................................... 6-6
Rollspot Function....................................................................................................... 6-7
CHAPTER 7: MAINTENANCE
Modification and Calibration........................................................................................... 7-1
Cover Removal .......................................................................................................... 7-1
Line Voltage Changes................................................................................................ 7-2
Calibration.................................................................................................................. 7-8
Troubleshooting ............................................................................................................... 7-10
Repair Service.................................................................................................................. 7-11
Telephone Service...................................................................................................... 7-11
Factory Service Repair............................................................................................... 7-11

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 vii
APPENDIX A: TECHNICAL SPECIFICATIONS
Type Power Supply.......................................................................................................... A-1
Power Requirements ........................................................................................................ A-1
Capacitor Bank................................................................................................................. A-1
Output Pulse Characteristics...................................................................................... A-1
Weld Fire Lockout ..................................................................................................... A-2
Line Voltage Regulation............................................................................................ A-2
Turndown Circuit....................................................................................................... A-2
Line Failure Turndown .............................................................................................. A-2
Over-Voltage Lockout ............................................................................................... A-3
Charge Lockout Circuit.............................................................................................. A-3
Polarity Selection............................................................................................................. A-3
Welding Speed ................................................................................................................. A-3
Weld Schedules................................................................................................................ A-7
Weld Schedule Definition.......................................................................................... A-7
Options ........................................................................................................................ A-7
Schedule Number at Power-Up ................................................................................. A-8
Utilities ........................................................................................................................ A-8
Information ...................................................................................................................... A-8
Weld Functions ................................................................................................................ A-9
Head Type........................................................................................................................ A-9
Squeeze Line.............................................................................................................. A-9
Cool Time .................................................................................................................. A-9
Hold Time .................................................................................................................. A-9
Footswitch Type............................................................................................................... A-10
FOOTSWITCH Connector ........................................................................................ A-10
Footswitch Weld Abort Feature....................................................................................... A-10
Footswitch Weld Abort On........................................................................................ A-10
Footswitch Weld Abort Off ....................................................................................... A-11
Firing Switch Type .......................................................................................................... A-11
Firing Circuit.............................................................................................................. A-11
Switch Debounce Time.............................................................................................. A-11
Mechanical Firing Switch Cable................................................................................ A-11
Optical Firing Switch Connector ............................................................................... A-12
Initiation Switch............................................................................................................... A-12
Manual Head Operation............................................................................................. A-12
Air Head Operation.................................................................................................... A-12
Chain Schedules Feature.................................................................................................. A-13
Step Count.................................................................................................................. A-13
Next Schedule ............................................................................................................ A-13
Audible Buzzer ................................................................................................................ A-14
End of Cycle Buzzer ON/OFF................................................................................... A-14
Key Click ................................................................................................................... A-14
Weld Counter................................................................................................................... A-14
Alarms ........................................................................................................................ A-15
Air Valve Driver .............................................................................................................. A-15

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
viii 990-290
Air Valve Driver 1 ..................................................................................................... A-15
Air Valve Driver 2 ..................................................................................................... A-16
Air Valve Driver Receptacles .................................................................................... A-16
Control Signals Connector............................................................................................... A-16
Emergency Stop ......................................................................................................... A-17
Charge (Process) Inhibit ............................................................................................ A-18
Remote Weld Schedule Selection.............................................................................. A-18
Binary Schedule Selection Code................................................................................ A-19
Relay Outputs................................................................................................................... A-20
Accessory Port ................................................................................................................. A-21
Input/Output Cable Connectors and Fusing..................................................................... A-22
Input Line Power........................................................................................................ A-22
Circuit Breakers ......................................................................................................... A-22
Fuses ........................................................................................................................ A-22
Power Input Connector .............................................................................................. A-22
Front Panel Switches........................................................................................................ A-23
Microprocessor CPU........................................................................................................ A-23
Display ........................................................................................................................ A-23
Cooling ........................................................................................................................ A-24
Physical Characteristics ................................................................................................... A-25
Index...................................................................................................................................... Index-1

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 ix
ILLUSTRATIONS
Figure Title Page
1-1 875DP Dual Pulse Resistance Welding Power Supply........................................ 1-1
2-1 Cable Routing Examples...................................................................................... 2-2
2-2 Terminal Connection Examples........................................................................... 2-2
2-3 Rear Panel Components....................................................................................... 2-3
2-4 Typical Solenoid Air Valve Assembly with a Single Regulator ......................... 2-6
2-5 875DP Equipment Interconnection Diagram....................................................... 2-9
3-1 Front Panel Controls ............................................................................................ 3-1
3-2 Screen Flow Chart................................................................................................ 3-5
4-1 Typical Solenoid Air Valve System with Dual Regulators ................................. 4-2
4-2 Typical Solenoid Air Valve System with a Single Regulator.............................. 4-3
4-3 Measuring Preset Firing Force of the Weld Head with a Force Gauge ............... 4-4
4-4 Results of Excessive Air Pressure........................................................................ 4-5
4-5 Weld Head Configuration Jumper Selection ...................................................... 4-6
5-1 Effects of Excessive or Insufficient Heat, Time and Pressure............................. 5-2
5-2 Typical Weld Strength Profile ............................................................................. 5-8
7-1 Line Voltage and Capacitor Bank Jumpering...................................................... 7-3
7-2 100 VAC Line Voltage Configuration................................................................. 7-4
7-3 115 VAC Line Voltage Configuration................................................................. 7-5
7-4 208 VAC Line Voltage Configuration................................................................. 7-6
7-5 230 VAC Line Voltage Configuration................................................................. 7-7
A-1 875DP Rep Rate with 10500 μF Capacitor Bank ................................................ A-5
A-2 875DP Hit Rate with 10500 μF Capacitor Bank ................................................. A-5
A-3 500DP Rep Rate with 6000 μF Capacitor Bank .................................................. A-6
A-4 500DP Hit Rate with 6000 μF Capacitor Bank ................................................... A-6
A-5 Pin Numbers as Viewed from the Rear Panel...................................................... A-12
A-6 Jumper Selection for Air Valve Driver Control................................................... A-16
A-7 CONTROL SIGNALS Connector ....................................................................... A-17
A-8 Remote Schedule Selection with a Remote Binary Switch ................................. A-20
A-9 875DP Physical Dimensions................................................................................ A-25
A-10 500DP Physical Dimensions................................................................................ A-26

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
x 990-290
TABLES
Table Title Page
5-1 Recommended Electrode Materials ..................................................................... 5-3
5-2 Causes of Imperfect Welds .................................................................................. 5-6
7-1 Power Supply Voltage Range Specifications ...................................................... 7-9
A-1 Pulse Characteristics ............................................................................................ A-2
A-2 Welding Speed ..................................................................................................... A-4
A-3 Binary Codes for Remote Weld Schedule Selection ........................................... A-19
A-4 Input Power Specifications .................................................................................. A-23

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 1-1
CHAPTER 1
SYSTEM DESCRIPTION
Applications
The 875DP (figure 1-1) is a versatile, 875 watt-second stored energy, capacitor discharge, dual pulse power
supply which can effectively solve most precision, small parts, resistance welding problems. Its exclusive,
context sensitive, User Help Screens quickly guide the user through even the most complex program.
Figure 1-1. 875DP Dual Pulse Resistance Welding Power Supply
WELD
NO WELD
SELECT
SAVE
HELP
CHNG
RUNPROGMENU
CONTROL





3
21
56
4
9
8
7
!
ENTER
0
DATA
POW ER
OFF
875 DUAL PULSE
STORED ENERGY POWER SUPPLY
•• ••
ON
I
O

CHAPTER 1: SYSTEM DESCRIPTION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
1-2 990-290
Unitek Peco’s Schedule Protection feature protects Schedules from unauthorized or inadvertent changes.
One of its 16 schedules serves as a scratch-pad which anyone can use to perform occasional jobs without
jeopardizing the integrity of the production line. The exclusive Weld Fire Lockout feature guarantees that
weld quality is independent of line voltage fluctuations and the speed at which the power supply is operated.
Dual Pulse Welding, an exclusive and unique feature of Unitek Peco power supplies, improves weld quality
and eliminates weld splash. Dual Pulse means each weld is performed with two pulses with independent
energy levels. The first pulse is used to displace the plating or contamination and reforms the surface so that
it is in intimate contact with the electrode. The second pulse welds the base metals. The Automatic Step
feature can be used to step to a new schedule, after a preset number of welds, in order to compensate for
electrode wear.
The 500DP, a modification of the 875DP, uses a different output transformer which provides 500 watt-
seconds. The 500HV provides 500 watt-seconds and uses an output transformer whose output voltage is
double that of the 500DP. The 500HV is frequently used in honeycomb welding and/or in those
applications which use handpieces whose cable lengths exceed 5 feet. Except for those specifications which
are directly related to energy rating and/or output pulse characteristics, the 500DP and 500HV are identical
to the 875DP.
The optional built-in Unitek Peco Weld Sentry adds a weld monitoring capability to the 875DP which
improves Process Control by detecting subtle changes in voltage, current, and power. The Remote Schedule
Feature allows the 875DP to reliably select weld schedules in automated applications. The 875DP can be
used with manual, user actuated, or air actuated weld heads.
The 875DP is a multi-voltage unit designed for operation at 100, 115, 208, or 230 VAC, 50/60 Hz.
Features
x Multi-function, microprocessor control with 16 discrete weld schedules provides repeatable process
control and is compatible with air or manually actuated weld heads. Facilitates multiple applications at
a single work station and protects weld schedules from changes by unauthorized personnel.
x Dual pulse welding eliminates weld splash. Improves weld quality especially when welding plated
materials.
x Four weld functions are available:
¾Basic
¾Dual Pulse
¾Rollspot (seam weld)
¾Sequence Repeat

CHAPTER 1: SYSTEM DESCRIPTION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 1-3
x User-friendly programming serves as a built-in manual which quickly guides users through the most
complex programs. Built-in software utilities make it easy to copy schedules and calibrate the power
supply.
x An optional built-in Weld Sentry integrates into user SPC system which simplifies data collection and
statistical analysis.
x Remote schedule selection simplifies use in automated systems. Remote external inputs connector
accepts control signals for: Emergency Stop, Remote Weld Inhibit, and Remote Weld Schedule
Selection.
x The chain schedule feature allows up to 15 schedules to be chained together in a user specified
sequence.
x The automatic step feature increases electrode life and reduces downtime for electrode dressing by
automatically changing weld energy to compensate for electrode wear.
x Schedule protection and system security features protects weld schedules, except Schedule 0, from
changes by unauthorized personnel.
x Power-up schedule selection allows any of the 16 schedules, or the last schedule used, to be specified as
the default power-up schedule.
x The digital display allows operators to set welding energy accurately and quickly.
x The 875DP is compatible with manually actuated weld heads and air actuated heads with 1-level or 2-
level footswitches.
x The 875DP is compatible with force fired and non-force fired weld heads. Squeeze (delay) time
adjustable from 0 to 9.9 seconds. An end cycle buzzer sounds at the end of each weld sequence as a
signal to the operator to release the foot pedal.
x There are two output relays which can be used to provide status signals to external devices. One relay
can also be used to control a second 24 or 115 VAC air actuated weld head.
x The built-in weld counters allow you to control events which are a function of the number of welds
which have been made.
x The firing circuit uses single pole, double pole or optical firing (pressure) switches.
x Weld fire lockout helps prevent poor welds caused by firing the power supply before the capacitor bank
is properly charged or discharged.

CHAPTER 1: SYSTEM DESCRIPTION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
1-4 990-290
x The foot switch weld abort safety feature causes the power supply to abort the welding process if the
operator releases the footswitch, on an air actuated system, before the end of the welding sequence.
x The line failure turndown safety feature discharges the capacitor bank when input power is interrupted.
x The 875DP is protected from radio frequency interference and electromagnetic interference to ensure
reliable operation even in high electrical noise environments. Input switch debounce circuitry eliminates
false triggering.

875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 2-1
CHAPTER 2
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 power
supply as close as practical to the weld head.
Power Line
CAUTION: Do not connect the line cord at this time.
This power supply was wired for the specific input line voltage marked on the line cord at the factory. The
standard unit is wired for 115 VAC. Reconnection for operation at another voltage may be made by a
qualified technician. Refer to Chapter 7 under Modifications and Calibration.
Welding Cables
Position the power supply on the work bench approximately 5 inches behind the weld head. Use the cables
furnished with the weld head to connect the terminals on the back of the weld head to the appropriate
terminals on the front of the output transformer. Convention is to connect the lower electrode of the weld
head or hand-piece to the (+) output terminal and the upper electrode to the ( - ) output terminal of the
power supply. If the weld head cables are unserviceable, use the following criteria in selecting new cables:
x Use No. 2 AWG welding cables, or No. 2/0 AWG welding cables if the cables are more than 12 inches
long. The diameter of the cables should be as large as practical.
x Use the shortest possible welding cables. It is not uncommon to have losses up to 50% per foot for No.
6 cable and 20% for No. 2 cable.
To reduce energy losses, follow these recommendations:
x Route cables so that they do not surround magnetic materials such as air solenoids, tooling, or steel weld
heads (see figure 2-1).

CHAPTER 2: INSTALLATION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
2-2 990-290
x 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).
x Bolt connections directly together. Do not place washers between the terminals of the output
transformer and the terminals of the cables. Tighten connections securely, they must be free from
oxidation, dirt and/or grease (see figure 2-2).
Figure 2-1. Cable Routing Examples


Steel Weld
Head
Solenoid
Cables taped together and routed
away from steel structure and
electromagnetic field
Weld
Head
Steel Fixture
C
ables not dressed together
a
nd close to steel fixture
DON’T DO







Lower Electrode
Holder
Upper Welding Cable
Screw, Flat
Washer,Nut
(2 Places)
Lower Welding Cable
Note: Attach both welding cables on the same side of the weld head.



Install flat washer under
screw head, not welding
cable terminal
Cap Head Screw and
Flat Washer
Figure 2-2. Terminal Connection Examples

CHAPTER 2: INSTALLATION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290 2-3
Rear Panel Components
(A) CIRCUIT BREAKER(S) - is used to protect the incoming power line.
(B) INPUT POWER CABLE - 5 foot cable is terminated with the appropriate 115 or 230 volt plug. The
standard plug for the 115 VAC power supply a NEMA 5-15P rated for 15 amps.
(C) FIRING CABLE - 4 foot cable is used to connect the power supply to the Force Firing Switch in all
Unitek Peco Weld Heads and Handpieces.
(D) FOOTSWITCH RECEPTACLE - Used to connect either a 1 Level or 2 Level Unitek Peco
Footswitch. Footswitches are only used with air or electrically actuated weld heads.
(E) FIRING SWITCH - 5 pin receptacle is used to connect the Power Supply to Weld Heads with either
a 3 wire Firing Switch or an Optical Switch.
CONTROL SIGNALS REMOTE DATA BUS
1 AIR VALVE DRIVER 2
FIRING SWITCH FOOT SWITCH FIRING CABLE
15
A B CDE F G
HI
Figure 2-3. Rear Panel of the 875DP/500DP/500HV

CHAPTER 2: INSTALLATION
875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
2-4 990-290
(F) AIR VALVE DRIVER 1 - Provides either 24 or 115 volts (AC) to Unitek Peco air actuated weld
heads. AIR VALVE DRIVER 2 is an optional output which is used to control a second air actuated
weld head.
(G) REMOTE DATA BUS - 25 pin, sub-miniature "D" connector used to interface with other Unitek
Peco devices.
(H) CONTROL SIGNALS - 15 pin, sub-miniature "D" connector used for Remote Schedule Selection.
See Chapter 10.
(I) OUTPUT POWER CABLE - 5 foot cable is used to connect the power supply to the external
transformer.
Firing Switch Connections
Connect the weld head or hand-piece to the appropriate firing cable or switch located on the rear panel of
the power supply.
Mechanical Firing Switch
Unitek Peco weld heads and hand-pieces are force fired and have two-pin firing switch connectors
which can be connected directly to the mating connector of the MECHANICAL FIRING SWITCH
located on the rear panel of the power supply.
Users of manually actuated weld heads which do not have force firing switches must connect the two
pins in the mechanical firing switch to an external switch in order to initiate the power supply.
Air actuated weld heads which do not have force firing switches rely on the squeeze time to ensure that
the weld head has time to close and apply the proper force to the workpieces. Use the squeeze time
option and select NO FIRING SWITCH from the Options Menu (refer to Chapter 3).
Optical Firing Switch
Users of weld heads with pressure switches using a 3-wire switch or an optical device should use the
OPTICAL FIRING SWITCH receptacle located on the rear panel of the power supply (refer to
Appendix A under Initiation Switch).
3-Wire Firing Switches
Users of weld heads with single pole, double throw, 3-wire pressure switches should also use the
OPTICAL FIRING SWITCH connector. The power supply will automatically detect that the system is
using a 3-wire switch if Pin 2 is low at power-up.