Lincoln TCV400, Operator'S Manual, Page: 15 / 31

B-4
OPERATION
B-4
TCV400
1. 24-PIN CONNECTOR RECEPTACLE
FIGURE B.1
PIN LEAD NO. FUNCTION
1 32 115 VAC
2 --- ---
3 31A 115 VAC
4 --- ---
5 GND Chassis Connection
6 24 24 VAC
7 41B 24 VAC
8 225B Voltage Feedback
9 77 Output Control
10 76 Output Control
11 75 Output Control
12 215B Voltage Feedback
13 --- ---
14 --- ---
15 32B Power Supply Enabled (115 VAC)
16 --- ---
17 --- ---
18 41A Power Supply Enabled (24 VAC)
19 474A 24 VDC
20 474A 24 VDC
21 476A 24 VDC
22 476A 24 VDC
23 216A Current Feedback, 100mV=750A
24 215A Current Feedback, 100mV=750A
23
22
21
20
19
18
17
16
15
14
13
11
10
9
8
7
6
5
4
3
2
1
24 12
WELDING CONTROLS
(See Figure B.2)
AUXILIARY POWER CONNECTIONS
The power source is equipped to furnish nominally
115 volt AC , 24 volt AC and 24 volt DC auxiliary
power for operating wire feeding equipment, etc. The
auxiliary power is available at the 24-pin connector
receptacle on the control panel and/or at a terminal
strip behind the hinged control panel on the front of
the power source.
2. 115V AC
is available at receptacle pins 1 and 3,
terminals 31 and 32. A 10A circuit breaker protects
this circuit.
3. 24V AC
is available only at receptacle pins 6 and
7. A 5A circuit breaker protects this circuit.
4. 24V DC
is available only at receptacle pins 19,
20, 21 and 22. A 15A circuit breaker protects this
circuit.
The 115V AC and the 24V AC are isolated circuits.
5. POWER SUPPLY LIGHT
A red light on the machine control panel indicates
when the tigger is enabled. This means auxiliary
power is being used.
6. THERMAL PROTECTION LIGHT
An amber light on the machine control panel indi-
cates when either of the two protective thermostats
have opened. Output power will be removed but
input power will still be applied to the machine.
7. PILOT LIGHT
A white light on the machine control panel indicates
when the power source input contactor is closed.
This means the main power transformer and all
auxiliary and control transformers are energized.
8. 115 VOLT POWER SWITCH
The power input contactor operates from an auxil-
iary 115 volt transformer that is energized through
the POWER toggle switch on the machine control
panel. “
I ” is on and “ 0 ” is off.
9. OUTPUT CONNECTIONS
The output terminals are recessed on the case
front. The TCV400 provides Tweco connector
receptacles.
Connect the positive output lead to the terminal
marked “+”. The negative output lead can be
hooked to either the low inductance terminal
(marked “ ” ) or the high inductance termi-
nal ( marked “ ”).
POLARITY SELECTION
Polarity selection is made by appropriately connect-
ing the electrode and work welding cables to either
the “
+
” stud or to one of the “
-
” studs.