Lincoln Electric SVM159-A Fan Motor And Control, Board, Removal Procedure will be, Former Test

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F-6

TROUBLESHOOTING & REPAIR

F-6

Observe Safety Guidelines

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

FUNCTION PROBLEMS

The machine regularly overheats

1. The welding application may

1. The 115VAC fan motor is con-

and the yellow thermal light is ON

be exceeding the recommended

trolled by the control board via

indicating a thermal overload.

duty cycle of the POWER WAVE

the main switch board. Perform

355/405.

the Fan Motor And Control

2. Dirt and dust may have clogged

Test.

the cooling channels inside the

1. A thermostat or associated cir-

machine.

cuitry

may

be faulty.

See the

3. Air intake and exhaust louvers

wiring

diagram.

One

normally

closed thermostat is located on

may be blocked due to inade-

the output choke, one on the DC

quate clearance

around the

Bus Board

and

the

other is

machine.

located on the main switch

4. Make certain the fan as needed

board heat sink. See the wiring

diagram.

(F.A.N.)

is

operating

properly.

The fan

should operate when

Note: The Main Switch

Board

welding

voltage

is

present

Removal Procedure will be

and/or when there is

an over

required

to gain access to

temperature condition.

the heat sink thermostat.

An attached wire feeder will not

1. Make certain the wire feeder

1. Check for 40 VDC on pin “D” (+)

function correctly. Apparently the

control

cable is connected to

and pin “E” (-) at the Power Wave

wire feeder is not being powered-

the wire feeder receptacle. See

wire feeder

receptacle.

See

up.

the Wiring Diagram.

Wiring Diagram.

2. Check the

two circuit

breakers

If 40 volts DC is Not present at

the Power

Wave

wire

feeder

located

at

the

front

of the

receptacle, perform the DC Bus

machine. Reset if tripped.

Board Test.

3. The wire feeder or control cable

2. Check the DC Bus Board rectifi-

may be faulty.

er. See Wiring Diagram.

3. Perform the T1 Auxiliary trans-

former Test.

4. If the 40 volts DC is present at

the Power Wave wire feeder

receptacle, the problem is in the

control cable or the wire

drive/control box.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353(WELD).

POWER WAVE 355/405