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FIGURE A.4 – CONNECTION OF LN-9 GMA TO DC-250, DC-400, and CV/CVI POWER SOURCES
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.
* Does not apply to DC-400 below code 9200 with polarity switch.
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 AWG or larger insulated wire physically suitable for the installation. An S16586-[ ] remote voltage
sensing work lead is available for this purpose. Connect it directly to the work piece keeping it electrically separate from the weld-
ing work lead circuit and connection. For convenience, this extended #21 lead should be taped to the welding work lead. (If the
length of work lead circuit is short, and connections can be expected to be reliable, then control cable lead #21 does not need to
be extended and can be directly connected to terminal #21 on the terminal strip. Note that this is not the preferred connection
because it adds error to the wire feeder voltmeter reading.)
N.C. Tape up bolted connection if lead #21 is extended.
N.D. Connect the control cable ground lead to the frame terminal marked near the power source terminal strip. The power source
grounding terminal (marked and located near the power source input power connections) must be properly connected to elec-
trical ground per the power source operating manual.
N.F. The LN-9 GMA voltage control jumpers must be connected as follows:
White jumper on voltage board to pin “S”.
Blue jumper on voltage board (later units only), or on start board (earlier units), to pin “B”.
*N.G. If lead #21 is to be connected to the terminal strip, connect to the #21 terminal that matches work polarity. This connection must
be changed whenever the electrode polarity is changed.
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