Thermal Dynamics AUTO-CUT 300 XT, Руководство по эксплуатации

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AUTO-CUT 300 XT
Manual 0-5300 APPENDIX A-59
247-252 Inverter Fault
Once the input contactors close applying voltage to the inverters several tests are performed. The Inverter Fault
signal latches on so even if the cause has gone away you can see that there was a fault as indicated by red LED
D1, INV FLT on the inverter Control & Fault PCB. It is reset by applying start signal or cycling power. If the
fault is still present it will come back on.
Things that cause an inverter fault:
• One or more of the local bias supplies (+/-12VDC) failed or out of spec. Green LEDs on Cap Bias board
l12V (D13) & -12V (D6) indicate the supplies are present but not necessarily that they are in toler -
ance.
• Input capacitor voltage imbalance indicated by D3 CAP IMBALANCE LED (red) on left side of main
inverter board. Applies to units with series connected capacitors (380-480V units).
• Too much current in the main transformer (switching transformer) primary, D32, PRI OC LED (red), on
inverter control board.
INV_FLT is a differential signal on pins 3(+) & 4(-) of the inverters 30 pin ribbon cable. If there is not a fault you
should read 5-6V between the two pins. If INV_FLT is true voltage on pins 3 & 4 will be less than 2V.
253-258 Inverter Over Temperature.
Each inverter section (IS) contains one or more temperature sensors. If any of these detect an over temperature
condition it activates the signal “OVERTEMP_FLT going to the CCM over the inverter sections ribbon cable.
Inverters semiconductors (transistors and diodes) are liquid cooled. Anything that increases the coolant tem -
perature too high can cause overheating of the inverters. The inverters magnetics (transformer & inductors)
are air cooled by the same fan(s) that cool(s) the liquid.
Possible causes:
• Cooling fan(s) not operating.
• Disrupted air flow.
• Defective inverter module.
• Inverter Ribbon cable bad connection.
• Defective CCM.
Originally 100 and 200A units had 2 smaller fans while 300 & 400A used a single larger fan along with a larger
radiator. More recently, the single larger fan may be used in the 100 & 200A as well.
Troubleshooting:
1. Confirm that air is exhausting from both the top (top fan)and bottom (bottom fan of units with 2 fans) of the
opening in the right side panel. As the fan(s) are behind the radiator it’s hard to see them to confirm they
are turning but perhaps you can use an inspection mirror. Refer to section for code 403 for troubleshooting
defective fans.
!
WARNING
Fan blades can be moving and accidental contact with a mirror or other
inspection devise can cause personal injury or damage to the machine.
2. Leaving the side panels and cover off, especially the left lower side or the top cover will reduce the air flow.
Also if the radiator fins become clogged with dust it will reduce air flow. Clean the radiator periodically by
blowing air into it to clear dirt from the fins.