Lincoln Electric NA-5NF, NA-5SF Optional START, Crater Fill and Weld Timer Boards, 5E-5

Models: NA-5S NA-5N NA-5SF NA-5NF

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E-5E-5

THEORY OF OPERATION

FIGURE E.3 Optional Start, Crater Fill and Weld Timer Boards

CONTACTOR CLOSURE (#2 AND #4)

TACH FEEDBACK (MOTOR RPM)

 

ARC VOLTS (SET & ACTUAL)

 

 

REMOTE VOLTAGE CONTROL (A, B, C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WORK SENSING (#21)

 

 

 

 

 

 

1/2 AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F501

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

115VAC

 

 

 

 

 

 

 

 

 

 

SET VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ODE

SENSING (#67)

VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TACH

 

C

 

 

 

 

TRAVEL

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

D

 

 

 

 

 

RECEPTACLE

FLUX

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

RECEPTACLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOTOR

S

 

 

 

A

 

3

 

 

 

 

 

 

 

 

 

 

U

 

 

 

R

A

CR

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

V D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

O

S

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y

 

 

 

T

H

CR

 

 

 

 

 

 

 

 

 

 

A

V

 

 

V

 

START

STOP

INCH

A

U

 

 

 

 

 

 

 

 

 

 

 

R

 

F

V

SWITCH

 

DOWN

G T

 

 

 

 

 

 

 

 

 

 

 

M

O

 

O

SWITCH SWITCH

E

D

 

 

 

 

 

 

 

 

 

 

 

A

L

 

I

L

O

 

 

 

 

O

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

 

 

 

T

T

 

E

T

L

 

 

 

 

N

CR

 

 

 

 

 

 

 

 

 

 

U

A

 

L

A

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

G

 

D

G

A

 

 

 

 

 

 

P

 

 

 

OPTIONAL

 

 

 

 

 

E

E

 

 

E

G

 

 

 

 

 

 

 

VOLTS

SPEED

START

START

 

INPUT

 

 

 

 

P

 

 

E

 

 

 

 

 

DC SUPPLY VOLTAGE

R

 

 

 

BOARD

TIMER

 

POWER

CIRCUIT

 

 

 

 

 

 

 

 

 

 

 

 

O B

STRIKE

 

 

 

SWITCH

BREAKER

 

R1(2 OHMS)

 

O F2

 

 

 

LOGIC

 

STRIKE/WELD PROCEDURE

 

 

OPTIONAL

CRATER

 

#31

 

 

 

 

W

 

 

 

 

 

 

 

C

O

 

 

CRATER

TIMER

CONTROL

 

 

 

 

 

 

 

 

 

 

ENABLE

 

 

BOARD

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

CABLE

115

 

 

 

 

E

 

 

 

 

 

 

E A

 

 

 

 

RECEPTACLE

V A C

 

 

 

 

R

 

 

 

 

 

 

 

 

 

D

R

 

 

OPTIONAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WELD

 

 

#32

 

 

F1

B

 

 

 

 

 

 

 

 

 

U D

WELD

TIMER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

O

 

FIELD

DIRECTION

SIGNAL

 

F

 

 

 

E

 

 

 

BURNBACK

 

 

 

 

 

 

 

A

 

 

 

 

 

 

VOLTS

SPEED

TIMER

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

MOTOR

ARMATURE

E

 

 

WELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

A

 

CURRENT

 

 

 

 

 

 

 

 

 

T1

T2

 

 

 

 

 

 

REED SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I

S

 

 

 

 

 

 

 

 

 

 

 

 

 

115VAC

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N

I

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

A

G

 

 

SET SPEED

 

 

 

 

 

 

 

 

 

36VAC (18+18VAC)

 

 

 

 

L

N

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

S

A

 

 

 

 

 

 

 

 

 

 

 

V

 

22VAC

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

10VDC REFERENCEVOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLT

SPEED

WIRE FEED SPEED (SET & ACTUAL)

 

 

CONTROL

 

 

 

TACH FEEDBACK (MOTOR RPM)

 

 

METER

METER

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

BOARD

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DIGITAL

DIGITAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

METER

METER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPTIONAL START, CRATER

FILL AND WELD TIMER

BOARDS

When installed, the optional start board

is pressed. This optional feature is

dictates to the procedure board the

helpful in controlling bead shape and

starting wire feed speed and arc volt-

filling craters at the end of a weld.

age. This condition can be operator set

 

for a predetermined period of time.

The weld timer permits setting of weld

These parameters can be set either

time for an adjustable period of time.

higher or lower than those of the weld-

This feature eliminates the need to

ing procedure to control penetration,

press the "stop" switch.

bead shape, or other factors at the start

 

of the weld. The start circuit becomes

 

active when the weld current sensing

 

reed switch is closed.

 

The crater fill board is used by the oper- ator to adjust the finishing wire feed speed and voltage either higher or lower than the welding procedure for an adjustable period of time. This circuit becomes active when the "stop" switch

NOTE: Unshaded areas of block logic diagrams are the subject of discussion.

NA-5

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Lincoln Electric NA-5NF, NA-5SF service manual Optional START, Crater Fill and Weld Timer Boards, 5E-5

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

The Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S are advanced welding helmets that are pivotal in enhancing the safety and efficiency of welders in various applications. These models are designed to provide exceptional protection and visibility, making them indispensable tools in the welding industry.

One of the main features of the NA-5 series is the auto-darkening filter technology. This feature allows the helmet to automatically adjust its shade based on the intensity of the arc. As the welder strikes an arc, the lens darkens instantaneously, shielding the eyes from harmful rays generated during the welding process. This functionality not only ensures safety but also enhances productivity, as welders do not need to manually flip the helmet up and down.

The helmets are equipped with a wide viewing area that allows for better visibility and precision while working. With a large lens, welders can easily monitor their work and surrounding environment, minimizing the risk of accidents. Additionally, the lightweight design of the NA-5NF, NA-5SF, NA-5N, and NA-5S provides comfort during extended periods of use, reducing neck strain and fatigue.

The NA-5 series is also well-regarded for its durability. Constructed from impact-resistant materials, these helmets can withstand the rigors of demanding work environments. This durability extends the lifespan of the helmet, making it a cost-effective investment for both professional and hobbyist welders.

Another notable characteristic is the adjustable sensitivity and delay settings found in certain models. These settings allow the user to customize the helmet based on their specific welding conditions. For instance, a welder can increase sensitivity for low-amperage tasks or adjust the delay to allow for a smoother transition from dark to light after completing a weld.

Furthermore, the helmets come with a reliable battery life, ensuring that they can be used for long periods without interruption. Some models also feature solar assist functionality, which helps recharge the auto-darkening filter, enhancing their overall efficiency.

In summary, the Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S welding helmets represent a significant advancement in personal protective equipment for welders. Their combination of auto-darkening technology, wide viewing area, lightweight design, durability, and customizable settings makes them an excellent choice for anyone engaged in welding tasks. With these helmets, users can achieve greater safety and efficiency in their work, enabling them to focus on their craft with peace of mind.