4.10
63
4.10.4 Power PC Board Over Current Protection (0558038315)
The power board uses a pair of current transformers to detect an over current condition on the output of
the PC1600. In the event the output exceeds the rated current, the induced signal in the transformers shuts
down the power circuit at the control board microcontroller.
The output from each of the IGBTs is passed to the output transformer through the Current Transformers L1
and L2. The output of these transformers is rectified and then connected to a buffering IC. When the output
of this op amp exceeds the error threshold, the control board micro shuts down the PWM and sends an er-
ror to the display.
When the PC1600 is operating, current flowing out of Q101 to the output transformer flows through a wire
that passes through the Current Transformer L2. The expanding and contracting magnetic field of the wire
induces a voltage in the Current Transformer. The output of this transformer is connected to a full wave
bridge, D12, where it is rectified and passed to op amp U10A on pin 3 for buffering. The output of U10A on
pin 1 passes through D10 and is sent to the main control board PCB1 as signal bridge_peak. When this
voltage exceeds 2.75 VDC the main control board PCB1 will shut down the PWM and send an error to the
display.
When the PC1600 is operating, current flowing out of Q102 to the output transformer flows through a wire
that passes through the Current Transformer L1. The expanding and contracting magnetic field of the wire
induces a voltage in the Current Transformer. The output of this transformer is connected to a full wave
bridge, D14, where it is rectified and passed to op amp U11B on pin 5 for buffering. The output of U11B on
pin 7 passes through D15 and is sent to the main control board PCB1 as signal bridge_peak. When this
voltage exceeds 2.75 VDC the main control board PCB1 will shut down the PWM and send an error to the
display.
It should be noted that the 2.75 VDC is the greater of the two outputs of the current transformers. If either
one of them puts out a signal greater than 2.75 volts DC, the PWM circuit will shut down. These two signals
are compared and the greater of the two is present at R73 before passing to the main control board.
SECTION 4
DESCRIPTION Of OPERATION
Summary of Contents for PowerCut 1600
Page 16: ...3 0 16 section 3 SPECIFICATIONS 3 4 Machine Operation Flowchart...
Page 27: ...4 2 27 4 2 Control Transformer T2 0558007188 SECTION 4 DESCRIPTION OF OPERATION...
Page 30: ...4 3 30 4 3 Input Bridge 0558007068 0558007077 SECTION 4 DESCRIPTION OF OPERATION...
Page 35: ...4 6 35 blank...
Page 38: ...4 8 38 4 8 PCB1 Control Board 0558038317 SECTION 4 DESCRIPTION OF OPERATION 4 10 6 8 5 3 11 7...
Page 52: ...4 8 52 4 8 14 PCB1 Layout 0558038317 SECTION 4 DESCRIPTION OF OPERATION...
Page 60: ...4 10 60 4 10 2 Power PC Board Schematic 2 0558038315 SECTION 4 DESCRIPTION OF OPERATION 3 14 8...
Page 67: ...4 10 67 4 10 7 Power Board_PCB2 Control Relays 0558038315 SECTION 4 DESCRIPTION OF OPERATION...
Page 77: ...4 10 77 4 10 16 Buss Supply IGBT SECTION 4 DESCRIPTION OF OPERATION...
Page 91: ...4 11 91 4 11 Power Driver 0558038335 SECTION 4 DESCRIPTION OF OPERATION...
Page 109: ...4 19 109 SECTION 4 DESCRIPTION OF OPERATION 4 19 PT38 Plasma Torch...
Page 110: ...4 19 110 SECTION 4 DESCRIPTION OF OPERATION 4 19 PT38 Plasma Torch...
Page 113: ...5 0 113 5 1 Wiring Diagram 230 460 Volt 0558007543 section 5 WIring diagrams...
Page 114: ...5 0 114 5 1 Wiring Diagram 230 460 Volt 0558007543 section 5 WIring diagrams...
Page 115: ...5 0 115 5 1 Wiring Diagram 230 460 Volt 0558007543 section 5 WIring diagrams...
Page 116: ...5 0 116 section 5 WIring diagrams 5 1 Wiring Diagram 230 460 Volt 0558007543...
Page 117: ...5 0 117 section 5 WIring diagrams 5 1 Wiring Diagram 230 460 Volt 0558007543...
Page 118: ...5 0 118 5 2 Wiring Diagram 400 400V CE 0558007547 section 5 WIring diagrams...
Page 119: ...5 0 119 section 5 WIring diagrams 5 2 Wiring Diagram 400 400V CE 0558007547...
Page 120: ...5 0 120 5 2 Wiring Diagram 400 400V CE 0558007547 section 5 WIring diagrams...
Page 121: ...5 0 121 section 5 WIring diagrams 5 2 Wiring Diagram 400 400V CE 0558007547...
Page 122: ...5 0 122 5 2 Wiring Diagram 400 400V CE 0558007547 section 5 WIring diagrams...
Page 123: ...5 0 123 section 5 WIring diagrams 5 2 Wiring Diagram 400 400V CE 0558007547...
Page 124: ...124 5 3 Wiring Diagram 575V 0558007545 section 5 WIring diagrams...
Page 125: ...125 section 5 WIring diagrams 5 3 Wiring Diagram 575V 0558007545...
Page 126: ...126 5 3 Wiring Diagram 575V 0558007545 section 5 WIring diagrams...
Page 127: ...127 section 5 WIring diagrams 5 3 Wiring Diagram 575V 0558007545...
Page 128: ...128 5 3 Wiring Diagram 575V 0558007545 section 5 WIring diagrams...
Page 129: ...129 section 5 WIring diagrams 5 3 Wiring Diagram 575V 0558007545...
Page 130: ...130 blank...
Page 135: ...6 0 blank 135...
Page 136: ...6 0 136 section 6 replacement parts 6 3 Front 0558007540...
Page 140: ...6 0 140 6 3 Top 0558007540 section 6 replacement parts...
Page 144: ...6 0 144 section 6 replacement parts 6 3 Left Inside2 0558007540...
Page 146: ...6 0 146 section 6 replacement parts 6 3 Rear View 0558007540...
Page 148: ...6 0 148 6 3 Front Rear Isometric Views 0558007540 section 6 replacement parts...
Page 159: ...159 section 7 mechanized conversion 20 Trim all tie wraps and replace the unit s cover...
Page 166: ...10 166 SECTION 9 General information 10 3 Ohm s and Watt s Laws...
Page 171: ...10 171 10 6 Ohm Testing SECTION 9 General information...
Page 172: ...10 172 10 7 Diode Testing SECTION 9 General information...
Page 173: ...10 173 10 8 Ripple SECTION 9 General information...
Page 174: ...10 174 10 9 Voltage Measurement SECTION 9 General information...
Page 178: ...10 178 IGBT Tester Schematic 10 10 1 IGBT Testing SECTION 8 General information...
Page 182: ...182 revision history Original release 11 2008 1...
