Miller Electric NT 450, NT 500 Voltmeter/Ammeter Help Displays, Help 3 Display, Help 7 Display

6-3. Voltmeter/Ammeter Help Displays

V A

1 HE.L P−0

V A

2

HE.L P−2

V A

3

HE.L P−3

V A

4

HE.L P−4

V A

5

HE.L P−5

V A

6

HE.L P−6

V A

7

HE.L P−7

8	V	A
	HE.L	P−9

.All directions are in reference to the front of the unit. All circuitry referred to is located inside the unit.

1 Help 0 Display

Indicates a shorted thermistor in the transformer of the unit. If this display is shown, contact a Factory Autho- rized Service Agent.

2 Help 2 Display

Indicates a malfunction in the thermal protection circuitry located on the transformer of the unit. If this display is shown, contact a Factory Authorized Service Agent.

3 Help 3 Display

Indicates the transformer of the unit has overheated. The unit has shut down to allow the fan to cool it (see Section 4-2). Operation will continue when the unit has cooled.

4 Help 4 Display

Indicates a malfunction in the thermal protection circuitry located on the secondary heat sink of the unit. If this dis- play is shown, contact a Factory Authorized Service Agent.

5 Help 5 Display

Indicates the secondary heat sink of the unit has over- heated. The unit has shut down to allow the fan to cool it (see Section 4-2). Operation will continue when the unit has cooled.

6 Help 6 Display

This is a two-stage error. The warning stage occurs when the primary voltage drops more than 12% below the linked primary voltage setting for more than 30 sec- onds. The display flashes a HELP 6 message during idle, but the welder continues to operate normally. Once the primary voltage returns to less than 10% below the linked primary voltage setting the flashing error ceases.

The shutdown stage occurs when the primary voltage drops more than 20% below the linked primary voltage setting for more than 30 seconds. A constant HELP 6 message is displayed, and weld output is disabled. Once the primary voltage returns to less than 10% below the linked primary voltage setting, the constant error mes- sage ceases, and weld output is enabled.

NOTE: Operating the welder out of the normal operating range (±12% of the linked primary) will affect the output and reliability of the welder, and is not recommended.

7 Help 7 Display

This is a two-stage error. The warning stage occurs when the primary voltage rises more than 12% above the linked primary voltage setting for more than 30 seconds. The display flashes a HELP 7 message during idle, but the welder continues to operate normally. Once the pri- mary voltage returns to less than 10% above the linked primary voltage setting the flashing error ceases.

The shutdown stage occurs when the primary voltage rises more than 20% above the linked primary voltage setting for more than 30 seconds. A constant HELP 7 message is displayed, and weld output is disabled. Once the primary voltage returns to less than 10% above the linked primary voltage setting the constant error message ceases, and weld output is enabled.

NOTE: Operating the welder out of the normal operating range (±12% of the linked primary) will affect the output and reliability of the welder, and is not recommended.

8 Help 9 Display

Indicates a shorted thermistor on the secondary heat sink of the unit. If this display is shown, contact a Factory Authorized Service Agent.

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