Lincoln Electric 355M, 405M service manual 5THEORY of Operation, Output Rectifier and Choke

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E-5THEORY OF OPERATION

FIGURE E.5 – OUTPUT RECTIFIER AND CHOKE

Main Switch Board	To Control
	Board

										Feed Cu back rrent
		Input switch		Input			Primary
				Rectifier
							Current
							Sensor
				Reconnect						Choke
				Switch
							Primary			se
							Current			n
										e
							Sensor
										Se
				Fan
						ontrolCFan			IGBTDriveSignal	g
e	{			115VAC Fan Supply			Primary Current Feedback(2)			ltaoVuttpuO
							Input Relay Control
P			Auxiliary				Soft Start Control
		220 VAC	Transformer				V/F Capacitor Feedback (2)
o
w
r					Machine Control Supply
W				40VDC
					+15VDC, -15VDC, +5VDC
a				Power
v				Board					Control Board
e			42VAC		RS232 Supply +5VDC
4		220
0					Can Supply +5VDC
5		Receptacle	65VAC
l
o				DC
n							Arc	Electrode
y				Bus			Link	Sense		21 Lead
				Board	40VDC		Wire			Voltage
							Feeder
										Sense
							Recp.		Thermostats	Recp.
									2
							To
							Feeder

OUTPUT RECTIFIER AND CHOKE

The output rectifier receives the AC output from the main transformer secondary and rectifies it to a DC voltage level. Since the output choke is in series with the negative leg of the output rectifier and also in series with the welding load, a filtered DC output is applied to the machine’s output terminals.

NOTE: Unshaded areas of Block Logic

Diagram are the subject of discussion

POWER WAVE 355M/405M

E-5

Positive

Output

Terminal

Negative

Output

Terminal

Yellow

Thermal

LED

Status

Red/Green

LED

R232

Connector