Section TOC
Master TOC
THEORY OF OPERATION
FIGURE E.3 – PRECHARGE AND PROTECTION
INPUT 115/230/1/50/60 VAC
L1 SW1 A 300uH
B |
RL3 |
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R1 |
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WORK CLAMP
V1 |
RL2
RL1
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Q2a,b,c | 6.8k/5W |
IRG4BC30W |
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FN1 | 230VAC | V2 |
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NO | COM | NC |
Purge Switch
115VAC
L1
T1
230V
RL1
115V
L1
Input
Voltage Board
12VDC
Air
Solenoid
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CN1 | 15VAC |
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2 | 15VAC |
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3 | SAFETY |
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4 | +28VDC |
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5 | SEC GND |
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6 | OVLOAD |
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8 | +12VDC |
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| 11 4 | 13 7 | 19 24 21 23 8 | 17 | 1 | 2 | 3 |
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| PS2 | PS1 | SEC GND OVLOAD | SAFETY | V+ EV1 +15Vrms | +12VDC | +8V SW +12VDC SW | SEC GND | OVLOAD | TRANSFER SW | TRANSFER | SOL 1 DRIVER | V OUT OUTPUT TRIGGER SOL 2 DRIVER |
| POT WIPER | POT CW | POT CCW |
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CN1 | 8 | 6 | 17 9 | 3 | 1 | 2 | 18 14 7 | 15 4 | 11 5 | 16 10 12 13 |
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Display LED's
Output Control
Control Board
PT
12VDC Solenoid 2
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PRECHARGE AND PROTECTION
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The input voltage is rectified by the input rectifier on the inverter board. The resultant DC voltage is applied to the filter capacitors through the automatic reconnect of the input board. The input board also contains precharging circuitry for the safe charging of the input filter capacitors. Once the capacitors are precharged the input board activates the RL3 input relay. This connects full input power to the filter capacitors. When the filter capacitors are fully charged they act as power supplies for the IGBT switching circuit. The IGBTs supply the main trans- former primary winding with DC current flow.
The inverter board also monitors the filter capacitors for overvoltage. If this occurs, the appropriate signal is sent to the control board to disable the machines output and to turn on the Thermal/Voltage Overload status LED. See IGBT Operation discussion and diagrams in this section.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.