Hypertherm Powermax900 Service Manual - Manual (Page 51)

M
AINTENANCE
3-24 Service Manual
CONTROL BOARD
Control Board LEDs
Control Board LEDs Visible from the Powermax900 Front Panel
• LED2 POWER ON: Illuminates when power is applied.
• LED5 LINE VOLTAGE: Illuminates different colors for different conditions.
•
LED5 not illuminated (white)
Extremely low AC line voltage or micro-controller failure.
• LED5 blinking yellow
Line voltage is less than 20% below nominal. In this condition, the power supply is
disabled and the contactor is open.
• LED5 continuous yellow
Line voltage is between 15% and 20% below nominal. Machine will function, but with
some performance degradation.
Lower Limit Line Voltage Upper Limit
(LED5 continuous yellow)
170VAC 200VAC 235VAC
178VAC 208VAC 239VAC
195VAC 230VAC 270VAC
204VAC 240VAC 276VAC
340VAC 400VAC 470VAC
408VAC 480VAC 552VAC
510VAC 600VAC 690VAC
• LED5 continuous green
Line voltage is within proper operating limits (between -15% and +15% of nominal as
shown above).
• LED5 continuous red
Voltage is greater than +15% of nominal, or
Retaining cap has not engaged the cap-sensor micro-switch, or
There is an inverter imbalance, or
There is a micro-controller failure.
• LED5 blinking red
There is an internal torch failure (a short from electrode to START or CAP lines).
• LED11 OVER-TEMP LED: Remains off when temperature is within operating limits. It
Illuminates when the thermostat in the power transformer T2 opens (over 135
° C (275° F)) or if
the heatsink becomes too hot (over 85
° C (185° F)). Overheating can be caused by exceeding
the duty cycle rate or by operating at low line voltage.
• LED14 GAS PRESSURE: Illuminates when incoming gas pressure sensed by PS1 is within
operating limits (over 39 psi (2.7 bar)).
Control Board LEDs Visible from Inside the Powermax900
• LED1 GAS SOLENOID: Illuminates when gas solenoid is energized (when GAS TEST switch
is pressed or when plasma start is pressed).
• LED3 PILOT ARC RELAY: Illuminates when pilot arc relay CR2 is energized.
• LED4 MAIN CONTACTOR: Illuminates when contactor CR1 is energized (following "soft
start").
Note: To avoid performance
deterioration of the
Powermax900, input voltage
(as measured at the input
terminals to the power supply
under load) should be within
10% of the specified system
line voltage setting.
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