CAPACITOR DISCHARGE CIRCUIT (K828-1)
Mounts inside the DC-400. Recommended when:
•DC-400 is used in conjunction with any LN-23P or older LN-8 or LN-9 semiautomatic wire-feeder. Eliminates possible arc flash re-start of weld when trigger interlock is used. Not required with current LN-8 (above Code 8700), or LN-9s with serial num- bers above 115187 (manufactured after 12/83), or any LN-9 having an L6043-1 Power PC Board.
•DC-400 is used with an LN-22 equipped with an older K279 Contactor-Voltage Control Option. Eliminates electrode overrun when gun trigger is released. Not required when later K279 (above Code 8800) is used.
•DC-400 is used with any semiautomatic wire-feeder and possible small spark is objectionable if elec- trode touches work just after gun trigger is released.
Install per M17060 instructions included with the kit.
HI-FREQ™ KIT (K799 FOR CODES 8634 AND ABOVE ONLY)
Kit supplies the high frequency plus gas valve for DC TIG welding. The DC-400 is shipped with proper R.F. bypass circuitry installed to protect the control circuit when welding with a HI-FREQ unit. K844 Water Valve Option Kit can be used with K799 when TIG welding with water cooled torches.
AMPTROL ADAPTER FOR K799 HI-FREQ KIT (K915. REQUIRES K864 ADAPTER OR K843 ADAPTER)
A “V” cable to connect a K799 Hi-Freq kit (5-pin con- nector) with either a K812 Hand Amptrol or a K870 Foot Amptrol (6-pin connector) and the machine. The cable going to the machine has a 6-pin connector which requires either a K864 adapter to connect with the 14-pin connector on the machine or a K843 adapter to connect to terminals #75, #76, #77 and the case grounding screw on the machine.
UNDERCARRIAGES (K817, K817R, K841)
For easy moving of the machine, optional undercar- riages are available with either steel (K817) or rubber tired (K817R) wheels or a platform undercarriage (K841) with mountings for two gas cylinders at the rear of the welder.
Installation instructions are included with each kit.
CONNECTION OF LINCOLN ELECTRIC AUTOMATIC OR SEMIAUTOMATIC WIRE FEEDERS
WARNING
ELECTRIC SHOCK can kill.
•Only qualified personnel should perform this maintenance.
•Turn the input power OFF at the dis- connect switch or fuse box before working on this equipment.
•Do not touch electrically hot parts.
Auxiliary power for wire feeder operation is available at both a 14-pin amphenol and at terminal strips with screw-type connections located behind the hinged control panel on the front of the machine. The 14-pin amphenol can provide both 115 VAC (pins A and J) and 40-42 VAC (pins I and K). The terminal strip pro- vides 115 VAC only (terminals 31 and 32). The two cir- cuits are isolated, and each is protected by a 10A cir- cuit breaker.
The following descriptions show how to connect the wire feeders using either the 14-pin amphenol or the terminal strip.
NOTE: The LN-742 wire feeder, because it operates on 42 VAC, can be connected only to the 14- pin amphenol.
AUTOMATIC WIRE FEEDERS
CONNECTING THE NA-3 TO THE IDEALARC DC-400 (TERMINAL STRIP)
1.Disconnect main AC input power to the Idealarc DC-400.
2.Set Idealarc DC-400 POWER toggle switch to the OFF (0) position.
3.Connect the wire feeder control cable leads to the Idealarc DC-400 terminal strip as shown in Figure C.4.
Connect the wire feeder control cable ground lead
to the frame terminal marked 
.
NOTE: The Idealarc DC-400 must be properly grounded.
