On Board Led's For The Stt Switch Pc Board - Lincoln Electric POWER WAVE STT Operator's Manual

POWER WAVE ® STT ® MODULE (CE)
MACHINE LED1
OUTPUT (GATE)
ON/OFF ON
ON OFF
ON OFF
ON/OFF OFF
DIFFERENTIAL I/O
(STT SWITCH SIGNAL)
J3
LED2
LED1
J2
STT STATUS
(OUTPUT)
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.
Observe all Safety Guidelines detailed throughout this manual

ON BOARD LED'S FOR THE STT SWITCH PC BOARD

STT SWITCH PC BOARD
LED2 LED3
(STATUS) (+15V)
ON Normal Condition – STT
ON
ON ON Normal Condition – STT
Note: During normal STT
detectable as a slight dimming.
OFF Status Failure (only when triggered). Should be accompanied by Error 99 on the
ON
external STT Module Status LED. Most likely caused by weld cable miscon-
nection (reverse polarity).
OFF ON/OFF 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 voltage to the STT Switch board.
B1
B5
INDICATION
® Switch is ON.
® Switch has been commanded OFF.
® operation the OFF state of the LED may only be
STT SWITCH
G6768-1
B2
B3
B9
SNUBBER
C1
C2
B6 B7
CAUTION
E-5
TROUBLESHOOTING
B4
STT IN
(B1 - B4)
STT OUT
(B5 - B8)
B8
J1
LED3
INPUT POWER
(40 VDC)