Miller Electric NT 450 - Manual (Page 29)

OM-2252 Page 25
6-3. Voltmeter/Ammeter Help Displays
.
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.
2
A V
3
A V
HE.L P−2
HE.L P−3
4
A V
HE.L P−4
5
A V
HE.L P−5
6
A V
HE.L P−6
7
A V
HE.L P−7
A V
HE.L P−0
A V
HE.L P−9
8
1