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page 41

Power-up cycle

After switching on the machine with the mains switch, the capacitors on the DCDRV pcb are charged up rst.

These capacitors are bu󰀨ering the bus voltage (rectied mains voltage). The input current during charge up

can be very high and must be limited to prevent the mains fuses to break. The current limitation is made by the

PWRUP pcb, where each phase is conducted via resistors to the mains rectier. After the bus voltage reached

a certain voltage (>250V DC), the resistors on the PWRUP pcb are short circuit with relays, so the the full mains

input is present and the bus voltage is at maximum (560V DC to 580V DC).

The bus voltage is monitored by the DSP (Process) and the relays on the PWRUP board are switched by the

microcontroller (Master).

Schematic

X4 / 1

X4 / 2

DK-PWRUP

X10 / 1

X10 / 2

X2 / 5

X2 / 6

X1 / 13

X1 / 7

DK-DCDRV

DK-MAPRO

+24V

Master

X9 / 1

X9 / 2

X6 / 1

X6 / 3

LORCH V24 User Manual

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