ESAB ESP-150 Manual De Instrucciones página 201

SecTION 5
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Proper Input
Power Applied
ROS ON
Is
OVER TEMP
Light
On?
NO
Is
READY/LOW GAS
Light
On?
YES
Set Gas(es) at proper
pressure with OSS
switch in CUT/START-
SHIELDmode .
Place OSS switch in
OPERATE
Depress Torch
Switch
Is
HIGH FREQ
Light
On?
YES
Does
LOW GAS
Light GO
Off?
YES
2 second delay
1 . Machine may be overheated .
YES
2 . Check connections to thermal switches
(TS) .
1 . Close top lid .
NO
2 . Check ISW switch
3 . Check CB1 .
"A"
1 . Check OSS switch .
2 . Check Torch Switch .
3 . Check PAC contactor to insure 24 VAC is
NO
applied to coil .
4 . Check PC Board .
5 . Check HFTR Transformer
1 . Check input gas pressure .
2 . Check gas flow of PT-26 . Check to be
sure consumables are good and prop-
NO
erly in place .
3 . Check torch switch for intermittent con-
nection .
4 . If using PT-26, check jumper between
pin 4 and 5 .
Does
TORCH ON
Light turn
on?
YES
Is
Pilot Arc
established
?
YES
Touch pilot arc to work piece within
6 sec . after pilot arc is established, or
pilot arc will turn off and begin cycling
on and off about every 3 sec .
Is
Main Arc
established
?
YES
HIGH FREQ light
goes out
Adjust cutting speed
Release torch switch
LOW GAS light
turns on
Unit in Post Flow mode
and ready to cut again .
"A"
201
MaINTeNaNce
1 . Check open circuit voltage .
Should be about 370 VDC . (Dis-
connect HF to avoid damaging
meter .)
NO
2 . Check input power .
3 . Check MC contactor .
4 . Check diodes and SCR's .
5 . Check PC board .
1 . Check consumables in torch .
2 . Check torch connections using
ohmmeter .
3 . Check open circuit voltage (325
VDC) . (Disconnect HF to avoid
NO
damaging meter .)
4 . Check HF at spark gaps . (ISW
switch must be closed when
performing check .) May have to
reset spark gap .
5 . Check PAC contactor .
6 . Check R20 and R21 resistors .
1 . Check work lead connection .
2 . Check consumables in torch .
3 . Check for proper nozzle and
current . At low currents, the arc
NO
length has to be closer to work .
4 . Check all input voltages between
lines .
5 . Check open circuit voltage .
6 . Check diodes and SCR's .
7 . Check PC board .