CONNECTION OF
POWER SOURCE |
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21
TO
INPUT CABLE PLUG
N.F.
CONTROL CABLE
FOR CONTROL CABLE
WITH 14 PIN
OR
FOR CONTROL CABLE WITH TERMINAL STRIP LEAD CONNECTORS
Do not operate with covers removed.
Disconnect power source before servicing.
Do not touch electrically live parts.
Only qualified persons should install, use or 
service this machine.
DC-655
+21 - 21 41 | 4 | 2 | 31 32 | 75 76 77 | N.E. |
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N.G. |
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| C | N.E. |
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| B | |
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| A |
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| 32 |
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| 31 |
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| 2 |
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| 4 |
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N.B. & N.C. |
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| GND |
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NEGATIVE |
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| POSITIVE |
| N.D. |
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| 21 |
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| N.H. |
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| ELECTRODE CABLE |
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| TO WIRE FEED UNIT |
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| N.A. |
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| TO WORK |
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REMOTE VOLTAGE SENSING LEAD
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 wire feeder (if equipped ) to proper polarity. Also refer to note N.F.
For proper setting of switches on power source, see power source operating manual.
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 from control cable with terminal strip connectors or from
Connect it directly to the work piece keeping it electrically separate from the welding 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 electrical ground per the power source operating manual.
N.E. If using an older
lead #77 to #77 on the terminal strip.
N.F. The
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.
N.H. Illustration does not necessarily represent actual position of appropriate output studs. Refer to power source instruction manual for more info.
S22977
