Problem Cause / Solution
1. The ON/OFF power switch is set to I (ON),
but the fan does not operate and the
POWER ON LED is not illuminated.
1.1 The power cord is not plugged into the power
receptacle.
Plug the power cord into the receptacle.
1.2 The disconnect power switch is not set to ON or
there is no power available to the disconnect power
switch box.
Turn on the power at the main power panel or at the
disconnect power switch box.
1.3 The safety interlock is activated.
If the power supply is turned on while the torch trigger is
pressed the torch will be disabled. To clear fault, release
the torch.
1.4 The voltage selector is not set to the correct
position.
If the voltage selector switch position is not set to match
the input voltage the POWER ON LED will not
illuminate, the torch will be disabled, and the fan will
rotate slowly. To clear this fault see Input Voltage
Selector Switch, Section 3.
3. The POWER ON LED is blinking. 3.1 Line voltage is either too low or too high.
The following table lists the operating range of the
Powermax380 power supply. Have an electrical
technician check incoming power.
Note: Input voltage should be within 20%
of the specified system line voltage.
System
Lower Limit Line Voltage Upper Limit
92 VAC 115 VAC 138 VAC
184 VAC 230 VAC 276 VAC
Basic Troubleshooting
2. All four of the LEDs are blinking. 2.1 Micro-processor fault.
Check to see if welding High Frequency (HF) is being
used near the Powermax380 power supply. Turn OFF
the welding HF if it is exists. Turn the PMX380 OFF and
then ON. If the problem persists see Technical
Questions in this section.
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