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A4, A11 Primary power modules, low-side MOSFET, secondary rectifier, comprising:
• Interconnection of MOSFET modules
• Voltage suppression
• Gate circuits
• Secondary rectifier with suppression circuits
A5, A12 Primary power modules, high-side MOSFET, secondary rectifier, containing:
• Interconnection of MOSFET modules
• Voltage suppression
• Gate circuits
• Secondary rectifier with suppression circuits
A6 It comprises:
• Supply for A2 and A6
• Potential separated torch button sense
• Solenoid valve driver
• High-voltage ignition control and driver
A7 HF ignition device
A8 Designed to ensure the more sophisticated primary and secondary inverter func-
tions. Control primary and secondary inverter; it comprises:
• Security of logic and control for secondary inverter
• Current and voltage welding process control
• Potential separation, secondary MOSFET-drivers for A9, A13, A10, A14
• Arc current and arc voltage monitoring
A9, A13,
A10, A14
Secondary power MOSFET modules, full bridge AC
converter, containing:
• Interconnection of MOSFET modules
• Voltage suppression
• Gate circuits
A15 E-Assembly, power filter, interference suppression circuit board, connector to
mains voltage cable
C1, C2,
C3, C4
Mains buffer capacitors. Comprising 4 series/parallel-connected capacitors with
symmetric resistors
C5 Capacitor for pump M5
C6, C7 Interference suppression capacitors to protective conductor
F1..
F10
Thermal switches, opening, see section A1-4 "TEMPERATURE MONITORING"
F11 Pressure switch for coolant circuit
L1 Smoothing inductor
L2 Choke, HF coupling and suppression inductor
M1 Fan, 230V AC
M5 Pump, 230V AC
Power
block
A4, A5, A9, A10, A11, A12, A13, A14: Comprising the high-current / high-voltage
section with forced cooling
Q1 Main switch 0/1 DTG 405
T1, T5 Current sensor transformer 200:1 for overcurrent shutdown
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