Tweco Merlin 6000GST Master PS - Manual (Page 72)

APPENDIX A-12 Manual 0-2652
APPENDIX 10-B: LADDER DIAGRAM - 15 vdc
(Rev AF or Later Logic Control PC Board)
3
LOGIC CONTROL BOARD
17
21
19
5
9
7
24
11
12
18
4
8
6
22
12
K4
K3
K2
K5
K1
PLASMA
SECONDARY
GAS
CONTROL
CIRCUIT
PRE-FLOW &
POST-FLOW
CIRCUIT
SWITCH
RECOGNITION
SEC SET
PILOT SET
PLASMA SET
Gas Control Module
MODE Switch (SW1)
START/STOP (CNC)
FS1
D8
START
INDICATOR
PWM
CONTROL
W
CONTACTOR
D9
J3-9
PWM
ENABLE
PWM DISABLE
(Only after main con-
tactor initially closes)
SENSE BRIDGE
VOLTAGE
<60VDC
SENSE BRIDGE
VOLTAGE
>60VDC
TP1
TP4
To disable
this circuit for troubleshooting
short test points together.
PILOT
CONTROL
HF AND
PILOT
DISABLE
HF AND PILOT
CONTACTOR
OK to Move
HFWS
CSR Indicator
D10
15 VDC SUPPLY
2 1
28 VAC
CENTER TAP
TORCH VOLTAGE/23
CSR (from Current
Control Board)
PS1
TS3 TS5 TS2
ALL PC BOARD INPUTS
ACTIVE LOW EXCEPT
J1-24 AND J1-21.
21 22
OVER-CURRENT SHUTDOWN
(From Switching Control)
REFERENCES J1 CONNECTOR REFERENCES J3 CONNECTOR
A-03297
D7
RUN
TS1 TS4
PWM-ON
RUN
Arc Starter Box