Lincoln Electric IM10058 POWER WAVE STT MODULE - Manual (Page 23)

E-5 TROUBLESHOOTING E-5
POWER WAVE ® STT ® MODULE
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
MACHINE
OUTPUT
ON/OFF
ON
ON
ON/OFF
LED1
(GATE)
ON
OFF
OFF
OFF
LED2
(STATUS)
ON
ON
OFF
OFF
LED3
(+15V)
ON
ON
ON
ON/OFF
STT
®
SWITCH PC BOARD
ON BOARD LEDʼS FOR THE STT
®
SWITCH PC BOARD
INDICATION
Normal Condition – STT ® Switch is ON.
Normal Condition – STT ® Switch has been commanded OFF.
Note: During normal STT ® operation the OFF state of the LED
may only be detectable as a slight dimming.
Status Failure (only when triggered). Should be accompanied by
Error 99 on the external STT
® Module Status LED. Most likely
caused by weld cable misconnection (reverse polarity).
Status Failure (constantly). Should be accompanied by Error 99
on the external STT
® Module Status LED. Most likely caused by
the on board power supply under-voltage lockout. Verify input volt-
age to the STT
® Switch board.
G6768-1
STT SWITCH
C1
C2
LED2
LED3
LED1
B1 B2 B3 B4
B5 B6 B7 B8
B9
J3
J2
J1
DIFFERENTIAL I/O
(STT SWITCH SIGNAL)
STT STATUS
(OUTPUT) INPUT POWER
(40 VDC)
STT IN
(B1 - B4)
STT OUT
(B5 - B8)
SNUBBER