
How the Plasma Power Supply Operates
7
170
810430
Troubleshooting Guide
Powermax65/85/105 SYNC
The digital signal processor (PCB2) monitors and controls the system’s operation and safety
circuits. The amperage adjustment knob on the control PCB (PCB1) is used to set the output
current: 20 A – 65 A for the Powermax65 SYNC or 25 A – 85 A for the Powermax85 SYNC. The
system compares the setpoint to the output current by monitoring the current sensors and adjusting
the output of the inverter IGBTs (Q9).
Powermax105 SYNC
200 V – 600 V CSA 3-phase functional description
AC power goes into the system through the power switch (S1) to the input diode bridge (D38). The
voltage from the bridge supplies the power factor correction (PFC) boost converter, which supplies
a nominal 760 VDC bus voltage. The bus supplies voltage and current to the inverter and the
flyback circuit (DC to DC converter) on the power PCB (PCB3). The power PCB provides noise
suppression and spike protection. The power PCB resistors (RT4, RT5) and relays (K2, K3) do a
“soft start.”
The PFC boost converter has an insulated gate bipolar transistor (Q11), PFC choke, and control
circuit. It supplies a 760 VDC bus voltage when the input AC voltage is between 200 VAC and
540 VAC. At 600 VAC, the nominal bus voltage is 840 VDC.
The inverter has a dual IGBT package (Q12), the power transformer, an output current sensor, and
the control circuit. The inverter operates as a pulse-width modulated half-bridge circuit driving an
isolation transformer. The output bridge (D36 and D37) corrects the output of the isolation
transformer.
The output circuitry has 2 current sensors located on the power PCB, the pilot arc IGBT (Q13), and
the output choke.
The digital signal processor (PCB2) monitors and controls the system’s operation and safety
circuits. The amperage adjustment knob on the control PCB (PCB1) is used to set the output
current: 30 A – 105 A. The system compares the setpoint to the output current by monitoring the
current sensors and adjusting the output of the inverter IGBT module (Q12).
230 V – 400 V CE 3-phase functional description
AC power goes into the system through the power switch (S1) to the input diode bridge (D38). The
voltage from the bridge supplies a nominal 760 VDC bus voltage. The bus supplies voltage and
current to the inverter and the flyback circuit (DC to DC converter) on the power PCB (PCB3). The
power PCB provides noise suppression and spike protection. The power PCB resistors (RT4, RT5)
and relay (K2) do a “soft start.”
The PFC boost converter has an insulated gate bipolar transistor (Q11), PFC choke, and control
circuit. It supplies a nominal 760 VDC bus voltage.
The inverter has a dual IGBT package (Q12), the power transformer, a current sensor, and the
control circuit. The inverter operates as a pulse-width modulated half-bridge circuit driving an
isolation transformer. The output bridge (D36 and D37) corrects the output of the isolation
transformer.
The output circuitry has 2 current sensors located on the power PCB, the pilot arc IGBT (Q13), and
the output choke.
Содержание Powermax105
Страница 1: ...Powermax65 85 105 SYNC Troubleshooting Guide 810430 REVISION 0 ENGLISH ...
Страница 12: ...Before You Begin 1 12 810430 Troubleshooting Guide Powermax65 85 105 SYNC ...
Страница 132: ...Do System Tests to Identify Defective Components 5 132 810430 Troubleshooting Guide Powermax65 85 105 SYNC ...
Страница 172: ...How the Plasma Power Supply Operates 7 172 810430 Troubleshooting Guide Powermax65 85 105 SYNC ...
Страница 174: ...System Diagrams 8 174 810430 Troubleshooting Guide Powermax65 85 105 SYNC ...
Страница 180: ...System Diagrams 8 180 810430 Troubleshooting Guide Powermax65 85 105 SYNC ...