Tweco Weld Sequencer - Manual (Page 60)

APPENDIX 54 Manual 0-2023
APPENDIX VI: TIMING AND SEQUENCE OF OPERATION
FOR WELD SEQUENCER (ALL MODELS)
A
• Power Supply to ON
• Weld Console in RUN position
• Coolant Recirculator to ON
• Gases on
• Torch positioned
• Weld Sequencer Enclosure to ON
• RP1 Control CONTACTOR to ON
• All other control modules to ON
B
• RP1 START SEQUENCE pressed
• CP1 starts pulsing current
• CS1 INITIAL CURRENT starts timing
• CC Relay de-energized
• AL Relay energized
C
• CS1 INITIAL CURRENT times out and Signals:
CS1 UPSLOPE to start
GS1 UPSLOPE to start
WT1 to start timing
D
•Peak current is reached
• Peak plasma gas flow is reached
• AL Relay de-energized
A
B
C
D E
A-02437
E
D
H
D
G
D
I
D
G
I
H
E
• WT1 times out and Signals:
CS1 to start downslope
GS1 to start downslope
AL Relay energized
E
D
• CS1 downslope delayed X seconds
• GS1 downslope delayed X seconds
G and G
D
• Current reaches FINAL level
• Gas flow reaches MIN flow level
• FINAL CURRENT starts timing
H and H
D
• FINAL CURRENT times out
• CC Relay energized
• Main Contactor opens
• Welding Arc extinguishes
I and I
D
• RP1 CONTACTOR to OFF
• All control modules to OFF
• Weld Sequencer Enclosure to OFF
• Welding Console to OFF
• Power Supply to OFF
• Coolant recirculator to OFF
• Gases shut off