Pro-Weld CD-312 Specifications
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Pro-Weld CD-312 is a heavy-duty portable CD stud/pin welder capable of welding up to 5/16” flanged studs in mild steel or stainless steel. It utilizes solid-state control for longer life, has easy maintenance, and can weld different sizes and materials of fasteners. It features contact welding, produces no reverse side marking, and is suitable for commercial and industrial applications.
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OPERATION/ MAINTENANCE
MANUAL
PRO WEL D
TABLE OF CONTENTS
1.0 INTRODUCTION 1
2.0 WARRANTY 1
3.0 UNPACKING YOUR UNIT 1
4.0 SUGGESTED SAFETY PRECAUTIONS 1
5.0 GENERAL DESCRIPTION 2
6.0 THE CD WELDING PROCESS 2
7.0 POWER REQUIREMENTS 3
8.0 SYSTEM SPECIFICATIONS 3
9.0 WELDING SYSTEM HOOK-UP 4
9.1 Straight Polarity 4
9.2 Reverse Polarity 5
9.3 Cuphead Pin 6
10.0 SYSTEM OPERATION 7
11.0 GUN SET-UP 9
11.1 Standard 9
11.2 Installing or Changing Collets or Chucks 10
11.3 For Weld Pins with Collet Protector 10
11.4 Template Adapter 11
11.5 Collet Protector with Blunt Leg 11
11.6 Parts List LD CD Handgun 14
12.0 WELDABLE MATERIAL COMBINATIONS 15
13.0 CAUSES OF POOR OR ERRATIC WELDS 16
14.0 TROUBLE SHOOTING POOR WELDS 16
15.0 ROUTINE WELDER MAINTENANCE 17
16.0 ASSEMBLY –CD-312 CONTROLLER 18,19,20
16.1 PC Board Assembly Drawing 21
17.0 TROUBLE SHOOTING – ELECTRICAL 22
18.0 CHECK LIST CD-312 SYSTEM P.N. 100-0108 24
19.0 CHECK LIST CD-312 SYSTEM P.N. 100-0109 24
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LIST OF FIGURES
1 CD CONTACT PROCESS 2
2 STRAIGHT POLARITY HOOK-UP 4
3 REVERSE POLARITY HOOK-UP 5
4 CUPHEAD PIN HOOK-UP 6
5 FRONT PANEL LAYOUT 7
6 STANDARD GUN SETUP 9
7 COLLET PROTECTOR SETUP 10
8 TEMPLATE ADAPTER GUN SETUP 11
9 COLLET PROTECTOR/BLUNT LEG SETUP 11
10 LIGHT DUTY CD GUN 13
11 HOT WELD 16
12 COLD WELD 16
13 ARC BLOW 17
14 WELD WITHOUT FOOTPIECE 17
15 GOOD WELD 17
16 PARTS LIST 18
17 PARTS LIST (continued) 19
18 PARTS LIST (continued) 20
19 PC BOARD 21
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1.0 INTRODUCTION
Your new stud welding equipment is carefully constructed of the finest components and materials available. Used properly, this equipment will give you years of profitable, efficient service.
The system incorporates the latest in engineering advances, for completely reliable end welding of mild steel, stainless steel, aluminum and lead free copper and brass fasteners.
A careful study of this manual will enable you to understand how the welder operates to insure proper performance under all operating conditions.
2.0 WARRANTY
The electrical and mechanical components of the stud welder are thoroughly performance inspected prior to assembly in the welder. The assembled welder is completely performance checked. The welder is delivered to you in functional electromechanical condition.
All parts used in the assembly of the welder and its accessories are fully warranted for a period of
1 YEAR from the date of delivery. In addition, the welding capacitors are warranted for a period of 1
YEAR from the date of delivery. The printed circuit boards used in all proweld equipment are warranted for a period of 3 years.
Under the warranty, the manufacturer reserves the right to repair or replace, at their option, defective parts which fail during the guarantee period.
Notice of any claim for warranty repair or replacement must be furnished to the manufacturer by the purchaser within ten (10) days after the defect is first discovered. The manufacturer does not assume any liability for paying shipping cost or any labor or materials furnished where such cost are not expressly authorized in writing.
The manufacturer does not warrant any parts or accessories against failures resulting from misuse, abuse, improper installation, maladjustment, or use not in accordance with the operating instructions furnished by the manufacturer. The warranty is valid only when studs are purchased from sources approved by the manufacturer or are of identical specifications to the manufacturer’s
CD -3 1 2
3.0 UNPACKING YOUR UNIT
Upon receipt of your unit, place it as close as possible to the point of installation before unpacking it. Do not operate the unit from an extension power cord if possible. Once the unit is unpacked it is recommended that you inspect it for any physical damage.
Your unit has been completely assembled and inspected at the factory. Upon receipt, the unit must be hooked up to the recommended incoming power before welding. We recommend that you check that you have received all the items listed on the shipping check list. (see SECTION 18 or 19)
Place the unit in a large enough area to provide adequate ventilation. Do not restrict the air flow through the side louvers. Do not allow water to enter the control housing.
4.0 SUGGESTED SAFETY PRECAU-
TIONS
In any welding operation, it is the responsibility of the welder to observe certain safety rules to insure his personal safety and to protect those working near him.
Reference is directed, without endorsement or recommendation, to ANSI Z49.1, Safety in Welding and Cutting, and to AWG Publication A6,1-66, Recommended Safety Practices for Gas-Shield Arc Welding.
1. Always treat electricity with respect. Under
open circuit conditions, the welding machine
output voltage may be dangerous.
2. Don’t work on live circuits or conductors.
Disconnect the main power line before check-
ing the machine or performing any mainte-
nance operations.
3. Be sure the welding machine cabinet is
properly grounded to a good electrical ground.
4. Don’t stand in water or on a damp floor
while welding or weld in the rain. Avoid wear-
ing wet sweaty cloths when welding.
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PRO WEL D
5. Don’t operate with worn or poorly con-
nected cables. Don’t operate weld gun with
loose cable connections. Inspect all cables fre-
quently for insulation failures, exposed wires,
loose connections, and repair as needed.
6. Don’t overload welding cables or continue
to operate with hot cables.
7. Don’t weld near flammable materials or liq-
uids, in or near atmospheres, or on ducts carry-
ing explosive gases.
8. Don’t weld on containers which have held
combustible or flammable materials, or on ma-
terials which give off flammable or toxic va-
pors when heated, without proper cleaning,
purging, or inerting.
9. Be sure to provide for proper ventilation
when welding in confined spaces.
10. Never look at the electric arc without wear-
ing protective eye shields.
11. Always use the proper protective clothing,
gloves, ect.
12. Never strike an arc when near a bystander
who is unaware of the dangers of ultraviolet
light on their eyes.
5.0 GENERAL DESCRIPTION
CD-312 HEAVY DUTY PORTABLE
CD STUD/PIN WELDER
The CD-312 portable CD welder is a self contained heavy duty capacitor discharge power supply capable of welding up to 5/16” flanged studs in mild steel or stainless steel (3/8” in weld base diameter).
It can weld up to 1/4 flanged studs (5/16” weld base diameter) in aluminum or brass.
The CD-312 utilizes a solid state control board for longer life and has been designed for easy maintenance and field service. This welder uses standard
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110 volt AC line voltage. The system comes complete with power cord, weld cables and gun. Just add the accessories required for the stud size to be welded.
This manual should provide all the information required for you to be able to set up, weld, and maintain the CD-312 welding system.
6.0 THE CD WELDING PROCESS
Contact welding is the simplest and most common method of CD stud welding. Practically foolproof, it produces no reverse side marking in most cases and is suitable for most commercial and industrial applications.
First, the gun must be set-up with the proper accessories for the length and diameter stud you are going to weld. Refer to the CD Accessories Guide and CD Stud Welding Gun Section for information on accessories and gun set-up.
1
3
Initial Contact During Weld
2
4
Forced Into Molten Pool After Weld
(FIGURE 1 CONTACT CD WELD)
The stud is first placed in contact with the base material (SEE FIGURE 1). Verify that the gun is held perpendicular to the work. Pulling the trigger discharges the capacitors through the stud which vaporizes the tip. The proper tip design is critical. This is what determines the length of time of the weld. An arc is briefly sustained which melts the stud base surface and the work surface directly underneath the stud. The spring pressure in the gun then forces the stud into the molten pool, completing the weld in approximately six milliseconds.
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This technique, when equipment is set up properly, is simple and easily mastered. The same power supply is capable of welding many different sizes and materials of fasteners. If you require assistance in selecting the proper accessories, contact our customer service department or your field representative.
7.0 POWER REQUIREMENTS
110 VOLT OPERATION
110 volt AC 60 H: 25 amp service
Internal : 20 amp;
circuit breaker (P/N: 104-0021)
Integral 9 foot power cord
IF EXTENSION REQUIRED
Cable Length 110 Volt
12’ #16/3
25’ #16/3
30’ #14/3
50 #12/3
8.0 SYSTEM SPECIFICATIONS
Weight:
48 Lbs.
Size:
8 1/2” W x 10” D x 16 1/2” H
21.6 cm W x 25.4 cm D x 42 cm H
Chassis:
16 Ga. Steel (Painted International Orange)
Panel Controls:
Power
Voltage Control
Weldable Materials:
Steel, Stainless steel, Aluminum, Copper,
Brass, Zinc coated, Galvanized
Weldable Stud Diameter:
12 Ga. Through 3/8” Weld Base
(Max W.B. Dia. For AL=5/16” {1/4” thread})
Weld Rate:
24 per minute 5/16”
Weld Voltage:
45-185 VDC
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Capacitance:
88,000 uF nominal
Weld Mode:
Contact
Polarity:
Straight or Reverse
Power Required:
110 Volt AC 60 Hz 25 Amp
Internal Fusing:
20 Amp Circuit Breaker
3AG 1 Amp 250 volt (2 on PC board)
STANDARD GUN & CABLE SPECIFICATIONS
WELD GUN-LIGHT DUTY PRECISION
CD CONTACT
Part Number:
300-0100 B Collet Gun
300-0101 Taper Tip Gun
Weight:
2 lbs. (not including cable)
( lbs. (including 25 ft. #4 weld cable & 16-4
SOW control cable)
Size:
6 1/2” x 5 3/4” x 2”
Weldable Stud Diameter:
14 Ga. Through 1/4” Flanged
Material:
High strength, impact resistant, glass fiber re-
inforced polycarbonate
Integral Gun Cable Length:
25 feet – #4 AWG
Connectors:
Male Camlok / 2 Pin Hubbell Male
Cables
Ground Cable:
(1) #4 x 15’ (P/N: 125-0100)
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9.0 WELDING SYSTEM HOOK-UP
9.1 Straight Polarity (Standard Set-Up) (see Figure 2)
A. Connect ground cable connector (1A) into camlok (1). The camlok should be connected into the receptacle marked GROUND. Twist until it locks. Attach “C” clamp (2) to the workpiece (5)
(CLEANED AREA).
B. Connect the gun control cable (3A) into the female receptacle (3).
C. Connect the gun weld cable (4A) into the receptacle marked GUN (4). Twist clockwise until it locks.
D. Connect AC power cable to AC outlet.
NOTE:
The gun welding and control cables must be laid out in a straight line. Poor weld quality may result if welding cables are coiled.
3
3A
4
4A
1
1A
2
5
Figure 2 Straight Polarity Hook-Up
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9.2 Reverse Polarity (Recommended for brass or galvanized) (see Figure 3)
A. Connect ground cable connector (1A) into camlok (4). The camlok should be connected into the receptacle marked GUN. Twist until it locks. Attach “C” clamp (2) to the workpiece (5) (CLEANED
AREA).
B. Connect the gun control cable (3A) into the female receptacle (3).
C. Connect the gun weld cable (4A) into the receptacle marked GROUND (1). Twist clockwise until it locks.
D. Connect AC power cable to AC outlet.
NOTE:
The gun welding and control cables must be laid out in a straight line. Poor weld quality may result if welding cables are coiled.
3
3A
1
1A
4
4A
2
5
Figure 3 Reverse Polarity Hook-Up
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9.3 Cuphead and Power Point pin hook-up (see Figure 4)
A. Connect ground cable connector (1A) into camlok (1). The camlok should be connected into the receptacle marked CUPHEAD. Twist until it locks. Attach “C” clamp (2) to the workpiece (5)
(CLEANED AREA).
B. Connect the gun control cable (3A) into the female receptacle (3).
C. Connect the gun weld cable (4A) into the receptacle marked GUN (4). Twist clockwise until it locks.
D. Connect AC power cable to AC outlet.
NOTE:
The gun welding and control cables must be laid out in a straight line. Poor weld quality may result if welding cables are coiled.
3
3A 4
4A
1
1A
2
5
Figure 4 Cuphead Pin Hook-Up
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10.0 SYSTEM OPERATION
(see Figure 4)
1. The CD-312 is designed for simple, yet precise operation.
2. It has an “ON-OFF” toggle switch/indicator light (1) and a variable voltage control dial (2), a ready indicator light (3), a contact light (4) and a trigger light (5) on the front panel.
3. Before turning the unit “ON”, the voltage control knob (2) should be turned counter-clockwise to the lowest setting.
4. With all cables connected, turn the unit on by putting the rocker switch (1) in the “ON” position. The integral indicator light (1) will turn on.
5. When the capacitors reach the charge voltage setting, the ready light (4) will turn on.
2
1
4
3
5
Figure 5 Front Panel Layout
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Setting the Weld Voltage/Capacitance
Slowly turn the voltage control knob clockwise to increase the weld voltage until the indicator knob is pointing at the appropriate number for the particular stud size that you are welding. (See the set up information chart).
NOTE:
Once the voltage control knob is set to a higher setting, turning it counter-clockwise will NOT reduce the voltage on the capacitor bank, until the toggle switch (1) is turned
“OFF” (for approximately 10 seconds).
The settings are marked with the voltages corresponding to various stud sizes. The approximate voltages for each stud size is as follows:
45 – 60 VDC Min.
65 – 95 VDC 12 ga.
95 – 120 VDC #8
120 – 145 VDC #10
145 – 180 VDC 1/4”
180 – 185VDC MAX.
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The voltage charge on the capacitor bank is read on the digital panel meter. The ready light indicates when the capacitors are charged and a stud may be welded.
Contact Light
The contact light indicates there is an acceptable electrical connection between the stud and ground. This light will turn on when the stud is placed in contact with the ground.
Trigger Light
The trigger light indicates there is a complete circuit to the unit through the gun control cable and switch. This light will turn on when the gun trigger is pressed.
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11.0 GUN SET-UP
11.1 STANDARD (see Figure 5)
The standard gun set-up is used for welding the majority of applications. It consists of the standard adjustable face plate, two legs, a foot, B-collet, stop, and spring for your specific stud size.
A step-by-step explanation of the correct way to set-up and operate the standard CD gun.
To prepare for stud welding, it is necessary to have the proper accessories for the stud to be welded. Those required are the legs, footpiece, spring, collet, and appropriate screws and washers.
A 3/32” and a 5/32” hex wrench are the only tools needed for the adjustment of the gun.
Figure 6 Standard Gun Setup
For CD welding, the stud normally should be engaged for all but 1/4” of its length, whenever possible. Selecting the proper stop will accomplish this for you. The objective of the collet is to maintain a firm grip on the fastener to assure correct alignment and a good electrical connection, yet allow for ease of loading.
Once the selection of the correct accessory is made, assembly may begin. The footpiece is mounted on the legs using 10-32 x 3/4” socket head cap screws, inserted through the holes at the base of the footpiece. These holes are recessed so that the head of the screws will not protrude.
After assembling the legs and footpiece, insert the collet and stop into the open end of the gun shaft.
Secure the collet in place with two set screws on the shaft. Locate the legs, with footpiece attached, in the holes provided in the gun faceplate. (It may be necessary to back off the socket screw in the faceplate to allow the legs to enter the hole). Center the opening of the footpiece around the weld end of the fastener. Tighten the footpiece in position at this time. Adjustment for the plunge which is the distance the stud protrudes beyond the end of the footpiece can now be made.
This is done by loosening the two 10-
32 x 1/4” set screws at the bottom of the faceplate using the 3/32” Allen wrench. Then sliding the legs for proper adjustment. Refer to the set-up chart for correct plunge distance (from
1/8” to 5/16”).
NOTE:
Correct set-up on all CD units is
1/8”- 5/16” plunge. This must be assured for proper weld results in all cases.
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The gun is now ready to weld. Select the proper setting for the size stud to be welded. Voltage is determined by the weld base diameter. Be sure your power source is set for the proper polarity: straight for steel, reverse for galvanized.
11.2 INSTALLING OR CHANGING COLLETS
OR CHUCKS
( The terms collet or chuck are different names for the same device). The collet holds the pin or stud to be welded. It is secured to the gun shaft by two set screws. These screws are loosened to remove or replace a collet. Tighten these screws snugly to secure the collet in place.
When you change the size of the stud you are welding, you must also change to the appropriate collet. If a collet becomes damaged or broken, it must be replaced. You may also need a stop.
11.3 GUN SET-UP FOR WELD PINS WITH
COLLET PROTECTOR (see Figure 6)
The collet protector has several advantages over the standard set-up.
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1. It does not require a pin stop.
therefore, the same setup is applicable
for a range of pin lengths.
2. There is a fixed plunge, no gun
adjustments necessary.
3. It provides stability at the weld end
of the pin.
There are two standard sizes available: 12 ga.
And 10 ga. It is used with the round faceplate and three blunt legs. The collet protector slides over the collet and fastens to the chuck with three allen set screws. The insert, which takes the place of the Interal stop, is replaceable.
The stud is pushed into the chuck until the flange bottoms out on the insert. The collet protector is not available for studs larger than 10 ga.
The standard adjustable legs and footpiece combination can alternately be used with the collet protector as shown in Figure 7.
PAGE 10
Figure 7 Collet Protector Gun Setup
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11.4 TEMPLATE ADAPTER (see Figure 7)
The template adapter is used when precise location or positioning of the CD stud is required.
It is used with the round faceplate and does not require a footpiece or legs. The adapter is fastened to the faceplate and provides a fixed distance between the collet and work. The plunge is set by using the correct stop in the collet. A template can then be fabricated to enable very precise locating of a particular stud.
The template adapter is available in two sizes, (1” and 1-1/4” diameter).
11.5 COLLET PROTECTOR/BLUNT LEG
(see Figure 8)
The round faceplate, with blunt legs, can alternately be used with the collet protector as shown in
Figure 8.
Figure 9 Collet Protector/Blunt Leg Setup
Figure 8 Template Adapter gun setup
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PAGE 12
Figure 10 Light Duty CD Gun
PRO WEL D
11.6 PARTS LIST LIGHT DUTY CD HANDGUN
Part No. 300-0100
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ITEM PART NO. DESCRIPTION QTY
1 033-384 GUN (CD) REAR CAP MOLDED 1
2 001-800 SPRING MAIN HEAVY SILVER 1
3 033-610 GUN (CD/DA) BEARING ASSEMBLY 1
4 033-799 GUN (CD) SHAFT TUBE 1
5 033-016 HEX HEAD CAP SCREW 3
6 033-382 GUN (CD/DA/FA) TRIGGER SPRING 1
7 049-955 M SCREW SET MS, BRASS PLT 2
8 NOT USED GUN (CD/DA/FA) CABLE CLAMP (ALUM. BLOCK) 1
9 033-404 TRIGGER SWITCH 1
10 033-381 GUN (CD/DA/FA) TRIGGER BUTTON MOLDED 1
11 036-496 GUN (FL) SHAFT BLOCK – A 1
12 033-662-25 GUN WELD CABLE (25 FT.) 1
13 033-658-25 GUN CONTROL CABLE (25 FT.) 1
14 033-881 GUN BODY RH & LH STD.CD MACHINED 1
15 033-445 GUN (CD/FL) SHAFT BOOT ASSY 1
16 033-447 GUN (CD) SHAFT BOOT RETAINING RING 1
17 033-665 GUN (CD) FACEPLATE – STD. ADJUSTABLE 1
18 033-446 GUN (CD) SHAFT BOOT SNAP RING 1
19 033-608 GUN (CD) WELD PIGTAIL ASSY 1
20 018-375 SCREW PAN HEAD 2
21 016-876 WASHED, LOCK INTO. TOOTH 1
22 033-757 LEG (CD) STD.ADJ. 7” 2 REF.
23 009-929 FLAT WASHER 2 REF.
24 016-378 SOCKET HEAD CAP SCREW 2 REF.
25 028-833 STD. FOOTPIECE 1 REF.
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12.0 WELDABLE MATERIAL COMBINATIONS
BASE MATERIAL STUD MATERIALS
Mild Steel (1008-1018) Mild Steel 1008, 1018
Stainless Steel 304, 305
Brass 65-35, 70-30
Copper, Silicon/Bronze
Galvanized Sheet (duct-”Q” Decking Mild Steel 1008-1018
Stainless Steel 304,305
Structural Steel (Must Be Clean) Mild Steel 1008,1018
Stainless Steel 304,305
Brass 65-35, 70-30
Aluminum – Most alloys of the Aluminum 1100,5356
1100, 3000 and 5000 series.
Zinc Alloys (Die Cast) Aluminum 1100, 5356
Medium Carbon Steel (1030-1018) Mild Steel 1008, 1018
Stainless Steel 304,305
Brass 65-35, 70-30
Lead Free Brass Mild Steel 1008, 1018
Lead Free Rolled Brass Stainless Steel 304, 305
Electrolytic Copper Copper, Silicon/Bronze
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13.0 CAUSE OF POOR OR ERRATIC
WELDS
1. Loose collet. Does not grip stud tightly.
(REPLACE) Not enough engagement of stud to collet. (CHANGE STOP)
2. Fault or loose ground connection. (REPAIR OR
TIGHTEN)
3. Poor surface condition of base material, excessive oil, grease, rust, ect. (CLEAN)
4. Voltage or capacitance setting too low or too high.
(ADJUST TO DIAMETER OF STUD)
5. Broken or loose cables. (REPAIR)
6. Dirt in gun. (CLEAN)
7. Incorrect polarity. (CABLES HOOKED-UP
WRONG)
8. Use of center punch or deep scribe. (DO NOT
USE CENTER PUNCH OR DEEP SCRIBES)
9. Cables too closely coiled.
10. Arc blow is evidenced by “one side” welds. In severe cases there will be no melting under one edge of flange while the opposite side is gouged out or appears excessively hot. The principle cause of arc blow is magnetic field induced by the current flow during the weld. It occurs most often on long, narrow strips of metal or near edges of sheets or plates.
In some cases, a change in grounding positions, or two grounds on the work piece, one at each end or edge of work, will correct the problem. For assistance in severe cases, contact your local sales representative.
11. Incorrect plunge setting. (ADJUST TO PROPER
SETTING)
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12. Incorrect spring. (REPLACE WITH PROPER
SPRING)
13. Poor stud quality.
14.0 TROUBLE SHOOTING POOR
WELDS
Figure 11 Weld too Hot
Weld too Hot
A) Decrease voltage.
B) Decrease capacitance.
C) Increase stud protrusion.
D) Increase spring pressure.
Figure 12 Weld too Cold
Weld too Cold
A) Increase voltage.
B) Increase capacitance.
C) Decrease stud protrusion.
D) Decrease spring pressure.
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Figure 13 Arc Blow
Arc Blow
A) Use double grounds.
B) Ground too close or not spaced
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15.0 ROUTINE WELDER
MAINTENANCE
Your CD-312 is designed for long service with minimum care. Ordinary common sense maintenance will keep it operating efficiently.
1. Treat the welding, ground, and control cables with respect. Avoid sharp bends and kinks which may break the cables. Don’t use the cables as a “tow line” to move the control. Avoid damage or straining the cables where they enter the gun or at the connectors.
2. It is good practice to occasionally remove the cover of the controller and clean with air and a soft brush around the components.
Figure 14 Weld without footpiece
Weld without footpiece
A) Use standard footpiece.
B) Use template adapter.
C) Use tripod blunt legs.
CAUTION
Be sure the controller is disconnected
from the power before removing the pro-
tective cover.
3. While the cover is removed, tighten all the weld cable connections and make sure all the screws on the capacitor terminals are torque to 30 inchpounds.
NOTE:
Keep the gun free of dust, dirt or foreign material
Figure 15 Good Weld
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16.0 ASSEMBLY CD-312 CONTROLLER (see Figure 15,16, & 17)
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1A
1
2
3
4
5
Figure 16 Parts List
6
ITEM DESCRIPTION PART NUMBER
1 Knob 102-0060
1A Charge Pot 25K 111-0001
2 SCR Mounting 124-0026
3 Main SCR 108-0001
4 Buss Bar 124-0037
5 Buss Bar 124-0036
6 Capacitor 106-0023
7 Chassis 101-0016
7
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14
15
16
17
CD -3 1 2
8
9
11
10
Figure 17 Parts List
12
13
ITEM DESCRIPTION PART NUMBER
8 Terminal Strip 102-0020
9 Transformer 105-0010
10 Dropping Resistor 112-0042
11 Discharge Resistor 112-0041
12 Nichrome Resistor 112-0043
13 PC Board 600-0007
14 Charging SCR 108-0002
15 Diode 108-0027
16 Charging Bridge 108-0017
17 Safety Discharge SCR 108-0042
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19
18
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20
21
22
23
24
Figure 18 Parts List
ITEM DESCRIPTION PART NUMBER
18 Power Switch 104-0013
19 LED Panel Meter 103-0002
20 LED Red 108-0028
21 LED Green 108-0029
22 LED Amber 108-0030
23 2-Pole Female Hubbell 107-0031
24 Female Camlok 107-0002
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16.1 PC BOARD ASSEMBLY DRAWING
FU2 and FU3 are 3AG 1 ampere fuses
R34
D11
R30
R25
R17
R44
R16
R18
R28
R27
D10
+
+
R12
R11
R31
ZD4
+
C9
R20
R26
R19
D13
R23
R40
R37
R36
D21
D16
D23
R41
R22
ZD3
R6
R32
ZD5
R35
D22
D2
R5
D1
R9
D9
R8
D18
D17
R7
R15
D7
D6
R3
R1
R2
D8
ZD2
ZD1
R39
+
D20
D19
CD -3 1 2
Figure 19 PC Board
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17.0 TROUBLE SHOOTING – ELECTRICAL
When troubleshooting the power unit/controller (welder), the following precautions must be observed:
1. Welder must be TURNED OFF!
2. Unplug power cable from welder and wait at least two minutes before checking components.
3. The use of a volt/ohmmeter is recommended where any voltage may be present.
4. Use a continuity tester ( or troubleshooting light) for continuity checks only.
5. Possible causes marked with a star (*) are generally the most common problems.
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
1. Welder does not turn on A. Power connections at Check connections.
and will not weld. Welder or 110 VAC outlet
not complete.
*B. Broken power cable or Check wires for continuity.
loose wire connection in Repair break.
the plug.
C. Fuse blown. Replace fuse.
2. Fuse blows each time *A. Shorted weld capacitor. Check safety vent seal for
unit is turned on. Rupture hole. Replace
defective capacitor.
B. Shorted rectifier (BR1) Check for a short across the
rectifier with ohmmeter.
Replace rectifier module if
shorted.
C. Incorrect primary hookup. Check transformer connections.
D. Shorted transformer Replace transformer.
assembly.
PAGE 21
PRO WEL D CD -3 1 2
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
3. Welder turns on but A. Ground cable connections Check for continuity
does not operate not complete.
*B. Broken gun control cable Check continuity between
or loose wire connection pins on control plug while
in the plug. Shorted or trigger is depressed.
open trigger switch. Should read continuity.
*C. Faulty printed circuit Replace with new PC
board. Board.
D. Shorted weld SCR. Check with ohmmeter
(should not show continuity
in either direction). Replace
rectifier module if shorted.
4. Weld is excessively hot A. Shorted charge SCR. Check with ohmmeter
regardless of voltage ( should not show continuity
setting. In either direction). Replace
if shorted.
*B. Faulty printed circuit Replace with new PC
board. Board.
C. Open voltage Replace defective voltage
potentiometer. Potentiometer.
5. Poor and erratic A. Improper gun setup. Check applicable gun setup
welding. Instruction page.
B. Improper grounding or Check applicable cable setup
cable setup or incorrect Instruction page.
polarity.
C. Weld cables are coiled. Straighten out cables.
D. Incorrect voltage setting. Adjust as necessary.
E. Studs or pins not Adjust legs as necessary.
perpendicular to work Replace defective legs.
surface.
PAGE 22
PRO WEL D CD -3 1 2
18.0 CHECK LIST CD-312 SYSTEM PT. NO. 100-0108
STANDARD CD-312 WELDING SYSTEM COMPLETE WITH B-COLLET GUN
AND 25’ #4 GROUND CABLE
ITEM DESCRIPTION PART # QTY
1. CD-312 CONTROLLER 110 VAC 200-0012 1
2. GUN ASSY. B-COLLET w/INTEGRAL 25 FT.WELD
& CONTROL CABLE 2-LEGS, and FOOTPIECE 300-0100 1
3. GROUND CABLE #4 X 15’ 125-0100 1
4. MANUAL, Operation and Maintenance CD-312 1
5. HEX WRENCH SET 1
19.0 CHECK LIST CD-312 SYSTEM PT. NO. 100-0109
STANDARD CD-312 WELDING SYSTEM COMPLETE WITH TAPER TIP GUN
AND 25’ #4 GROUND CABLE
ITEM DESCRIPTION PART # QTY
1. CD-312 CONTROLLER 110 VAC 200-0012 1
2. GUN ASSY. TAPER TIP w/INTEGRAL 25 FT.WELD
& CONTROL CABLE 2-LEGS, and FOOTPIECE 300-0101 1
3. GROUND CABLE #4 X 15’ 125-0100 1
4. MANUAL, Operation and Maintenance CD-312 1
5. HEX WRENCH SET 1
PAGE 23
MANUFACTURED BY
PRO WELD
MADE IN THE U.S.A.
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