CEBORA S.p.A.
20
3.302.089
31/05/02
3.4.3
- Red led (N) lit = power source blocked.
This indicator indicates that the power source is in the process of selecting the mains voltage,
in the first 3 seconds after closing the switch (9), or, thereafter, is blocked due to a hazardous
condition.
To identify the cause, consider when the block occurs (for ex.: upon start-up, during operation
with pilot arc or cutting), and seek out the possible error conditions among those described in the
following chapters.
3.4.4
- Alarms shown at power source start-up.
NOTE
The moment of start-up is decisive in selecting the operating range.
With voltage below approximately 150 Vac, operation is set at 115 Vac; with voltage greater
than approximately 150 Vac, operation is set at 230 Vac.
Once set, the range of operation does not change until the next start-up.
- Power source supply voltage high.
If the supply voltage of the power source, at the start-up, is greater than approximately 280
Vac, the control blocks the unit for high voltage in the range of 230 Vac.
If the supply voltage of the power source, at the start-up, is between approximately 140 and
150 Vac, the control blocks the unit for high voltage in the range of 115 Vac.
If the supply voltage of the power source, during working conditions, rise over 280 Vac or
rise over 145 Vac, the control blocks the unit for high voltage in the respective ranges.
In these situations the power source delivers no current and the red led (N) remains lit.
Since the power source and fan (15) remain powered with high voltage, we recommend that
you not allow this situation to continue for very long.
To restore proper operation, shut off the power source and power it with the correct voltage.
- Power source supply voltage low.
If the supply voltage of the power source, at the start-up, is between approximately 150 and
190 Vac, the control blocks the unit for low voltage in the range of 230 Vac.
In this situation the power source delivers no current and the red led (N) remains lit.
If the supply voltage of the power source, at the start-up, is less than approximately 90 Vac,
the control blocks the unit for low voltage in the range of 115 Vac.
In this situation the red led (N) remains off, even in the first three seconds after closing the
switch (9), and the power source delivers no current.
Proper operation is automatically restored when the supply voltage returns within the allowed
limits.
- Unusual supply voltage to the mosfet drive circuits on power board (35).
If an incorrect voltage is detected, at the start-up, in the drive circuits of the power mosfets on
the power board (35), with the correct power source supply voltage, the power source remains
blocked, without delivering current and with the red led (N) lit.
To restore operation, shut off the power source, wait for the DC capacitors to discharge
completely (approximately 9 minutes), and restart the power source with the rated supply
voltage.
If the alarm persists, the power board (35) may be defective, and should thus be replaced.
- Start button pressed during power source start-up.
See START COMMAND TEST, par. 3.3.4.
