Tweco 15XC Merlin - Manual (Page 126)

APPENDIX A-2 Manual 0-2251
APPENDIX 2: LADDER DIAGRAM - 15 VDC
3
LOGIC CONTROL BOARD
13
11
19
15
21
17
5
9
7
24
11
12
18
14
20
16
4
8
6
22
12
K4
K3
K2
K5
K1
PLASMA
SECONDARY
GAS
CONTROL
CIRCUIT
PRE-FLOW &
POST-FLOW
CIRCUIT
SWITCH
RECOGNITION
RUN
SET
PURGE
SW2
START/STOP (CNC)
START/STOP (Hand)
START (Momentary CNC/Remote)
STOP (Momentary CNC/Remote)
FS1
D57
START
INDICATOR
CONTACTOR
CONTROL
W
CONTACTOR
D38
J3-9
PWM
ENABLE
CONTACTOR 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
D63
15 VDC SUPPLY
2 1
28 VAC
CENTER TAP
TORCH VOLTAGE/23
CSR (from Current
Control Board)
OXYGEN
WATER
GAS
PS2
PS1
TS3 TS1 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-00878