Miller Electric 500DX R Owner's Manual download pdf (Page 27)

OM-129 647 Page 23

5-4. Description Of Controls For Models With CV Option (See Section 5-3)

 This unit has a max OCV control circuit

that resets Amperage/Voltage Control

R1 to maximum when the arc breaks.

When an arc is struck, weld output con-

trol returns to the R1 front panel or com-

bination front panel/remote control

setting. The Amperage/Voltage control

adjusts amperage only when constant

current (CC) welding and does not ad-

just open-circuit voltage. The max OCV

control circuit does not function when

constant voltage (CV) welding.

1 Ampere Range Switch

 Do not switch under load.

Use switch to select one of five ampere

ranges. Use the lower four ranges for CC

welding. Use the highest range for CV/DC

welding.

For most welding applications, use lowest

amperage range possible to help prevent arc

outages.

2 Amperage/Voltage Control

With CC/CV switch in CC position, use con-

trol to adjust amperage within range selected

by Ampere Ranges switch. With switch in CV

position, use control to adjust voltage.

Weld output would be 223 A DC with

amperage controls set as shown (50% of 125

to 320 A).

3 Manual Stop Control

4 Engine Start Button

5 Ether Starting Aid Switch (Optional)

Push switch up and release while cranking

engine to release ether.

 Do not use Ether if engine is running.

To Start: Press button and use Ether switch

(if necessary). Release button when engine

starts.

Do not crank engine while engine is turning.

To Stop: Pull control out and hold. Release

control when engine stops.

6 DC Ammeter (Optional)

7 DC Voltmeter (Optional)

8 Oil Pressure Warning Light

Light goes off if oil pressure is too low.

 If light goes off, stop engine and

check oil level.

9 Battery Charging Warning Light

Light goes on when battery is not charging.

 If light goes on, stop engine and

check engine belt.

10 Engine Hour Meter

11 Polarity Switch (Optional)

12 Constant Current/Constant Voltage

(CC/CV) Switch

Use switch to select type of weld output. Use

CC for Stick (SMAW) welding. Use CV for

wire feed processes (MIG, FCAW). If using

CV, place Ampere Range switch in maxi-

mum position.

13 Output/Contactor Switch

 Weld output terminals are energized

when Output/Contactor switch is On

and engine is running

Use switch to control remote contactor con-

nected to Remote 14 receptacle RC3 or ter-

minal strip 2T.

For weld output, place switch in the On posi-

tion. Open-circuit voltage is present at the

weld output terminals whenever engine is

running.

For remote output control, place switch in

Remote position. Open-circuit voltage is

present at the weld output terminals when

remote contactor switch is closed.

14 Amperage/Voltage Control Switch

Use switch to select front panel or remote

amperage and voltage adjustment.

For front panel control, place switch in Panel

position. For remote control, place switch in

Remote position and connect remote control

to Remote 14 receptacle RC3 or terminal

strip 2T.

S-185 440 / Ref. ST-185 762-B / S-0774

Min

Max

Set Switches Adjust Remote ControlSet Range Set Percentage

Example: Combination Remote Amperage Control

In Example:

Mode = CC

Range = 125 to 320 A DC

Percentage Of Range = 50%

Min = 125 A DC

Max = 223 A DC

(50% of 125 to 320)

(223 A DC)

(125 A DC)

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