SECTION 9:
MAIN CIRCUIT DESCRIPTION
WARNING
Turn o power and disconnect mains supply plug from receptacle before working on the unit. Allow two minutes for capacitors to
discharge and check that the DC bus voltage has discharged to less than 5VDC, refer to Section 10.04, after disconnection from mains
supply voltage.
The 240VAC mains supply voltage is connected via a double pole switch to the input rectifiers on the Main Inverter
Board through an EMC Filter Circuit on the EMC Board. Overvoltage protection is provided by a varistor, 20D511K,
rated at 320VAC/220J in the EMC Board.
Rectifier, B1, output charges the main capacitor bank (C4, C5, C6, C8) to a high DC voltage, 340VDC once J1//
J2 closes, through the Pre-charge Start Circuit. Inrush current limiting is provided by V1 & V2 which are short
circuited by relay J1//J2 after a few seconds.
To Next Page
Loading...
