TROUBLESHOOTING AND REPAIR
B-21
B-21
LT-7 TRACTOR
PC BOARD STATUS LIGHTS
Table B.1 is a summary of the on/off states of the LED’s on the Control Board, Logic Board and
Voltage Board for various conditions of the LT-7. Table B.2 lists the functions that these LED’s indi-
cate.
LIGHT NUMBER
FUNCTIONS INDICATED BY PC BOARD LEDS
1A
INCH UP SWITCH PRESSED
1B
LOGIC SIGNAL FOR MOTOR TO RUN
1C
DOWN FIELD VOLTAGE APPLIED
1D
UP FIELD VOLTAGE APPLIED
1E
ARMATURE VOLTAGE APPLIED
2B
START SWITCH PRESSED
2C
STOP SWITCH PRESSED
2D
WELD CURRENT PRESENT
2E
SIGNAL TO APPLY DOWN FIELD VOLTAGE
2F
INCH SPEED CIRCUIT OPERATIVE
2H
SIGNAL TO ENERGIZE TRAVEL CIRCUIT
2J
INCH DOWN SWITCH PRESSED
2K
SIGNAL TO OPERATE POWER SOURCE CONTACTOR
2L
WELD VOLTAGE CONTROL OPERATIVE
2M
GROUND LEAD PROTECTOR “TRIPPED”
3A
ELECTRODE VOLTAGE (OUTPUT FROM VV BOARD)
3B
ELECTRODE VOLTAGE (INPUT TO VV BOARD)
INDICATOR LIGHTS
CONDITIONS FOR LIGHT “ON”
LIGHT
LOCATION
IDLE
INCH UP
INCH DOWN
START
STOP
BURNBACK
GROUND
NO.
MODE
SWITCH
SWITCH
SWITCH
SWITCH
MODE
LEAD
PRESSED
PRESSED
PRESSED
PRESSED
PROTECTOR
TRIPPED
1A
CONTR. BD.
ON
1B
CONTR. BD.
ON
ON
1C
CONTR. BD.
ON
ON
1D
CONTR. BD.
ON
ON
ON
ON
ON
ON
1E
CONTR. BD.
ON
ON
ON
2B
LOGIC BD.
ON
2C
LOGIC BD.
ON
ON
ON
2D
LOGIC BD.
ON*
ON*
ON*
ON
ON
ON*
2E
LOGIC BD.
ON
ON
2F
LOGIC BD.
ON
ON
ON
ON
ON
2H
LOGIC BD.
ON
2J
LOGIC BD.
ON
2K
LOGIC BD.
ON
ON
2L
LOGIC BD.
ON
2M
LOGIC BD.
ON
3A
VOLT BD.
ON
ON
ON
3B
VOLT BD.
ON
ON
ON
Table B.1 P.C. Board Status Lights
ON* INDICATES LIGHT IS DIM
Table B.2 P.C. Board Status Light Definitions
Содержание LT-7
Страница 9: ...NOTES A 4 A 4 LT 7 TRACTOR...
Страница 32: ...NOTES B 23 B 23 LT 7 TRACTOR...
Страница 38: ...NOTES B 29 B 29 LT 7 TRACTOR...
Страница 43: ...NOTES C 3 C 3 LT 7 TRACTOR...
