Lincoln Electric IDEALARC DC-1500 Service Manual page 23

C-3
Connection of DC-1500 to NA-3 (All), LT-5 or LT-7
Above diagram shows electrode connected positive. To change polarity, turn power
off, reverse the electrode and work leads at the power source and position the switch on power
source to proper polarity. Also reverse the leads on the back of the ammeter and voltmeter in
the automatic control box.
Connection of DC-1500 With NL Option Kit (K783) to LT-3 or LT-34 (Obsolete)
N.A. On codes above 8234 extend lead 67 and
connect it to the electrode cable going to the
automatic equipment.
N.B. On codes below 8234 this is #67 and the LT-
3 or LT-34 #67 lead can be connected either
to #67 or to the electrode cable ter-minal as
shown. Terminal 82 not present on later DC-
1500's.
N.C. Terminals 73 and 74 not present on earlier
DC-1500's.
ACCESSORIES
Connect the control cable ground lead to the frame terminal marked
near the power source terminal strip. The power source must be
properly grounded.
To automatic control box.
* If using an older control cable: Connect lead #75 to #75 on terminal
strip, connect lead #76 to #76 on terminal strip, connect lead #77 to
#77 on terminal strip.
N.A. Welding cables must be of proper capacity for the current and
duty cycle of immediate and future applications.
N.B. Extend lead 21 using #14 or larger insulated wire physically suit-
able for the installation. An S16586 remote voltage sensing work
lead is available for this purpose. Connect it directly to the work
piece keeping it separate from the welding work lead circuit and
connection for convenience, this extended #21 lead should be
taped to the welding work lead.
N.C. Tape up bolted connection.
N.D. Terminals 73 and 74 not present on earlier DC-1500.
This diagram shows the electrode connected positive. To change
polarity, turn power source off, reverse the electrode and work leads
at the power source and position the switch on the power source
and th NL option kit to the proper polarity. Also reverse the leads on
the back of the ammeter and voltmeter in the LT-3 control box.
Contactor drop out delay switch on the NL option kit must be in the
"On" position.
The 4/0 cables shown will handle up to 1000 amps at 80% duty cycle.
For higher currents or duty cycle add additional cables to the power
source output studs.
IDEALARC® DC-1500
C-3
source
S15534
2-26-82B
WARNING
• Do not operate with covers
removed.
• Disconnect welding power source
before servicing.
• Do not touch electrically live
parts.
ELECTRIC SHOCK
• Only qualified persons should
can kill.
install, use or service this
machine.
M13322
2-26-82C