Kemppi Mastertig MLS 3003 ACDC Service Manual page 18

A002 Auxiliary power card
Functions and connectors
A002 Auxiliary Power Supply Main Functions
- output voltage 24Vdc
- input voltage range (450 ... 750)Vdc (X1, X3)
- output power 100W continuous with forced cooling
- switching frequency 100kHz
- topology flyback
- forced "hiccup" mode in overload (X17 off)
- over voltage switch off about 830Vdc
- low voltage wake-up 200Vdc
- supply 24Vdc also to water cooler unit
- floating secondary inverter gate drive voltages 35Vdc
- supply also auxiliary power to pre-inverter and
primary diode card 35Vdc (X2)
H4 = gate voltage dc+
H5 = gate voltage aid+
Factory setting
X17 = off
X17 = no forced "hiccup" mode
H3 = gate voltage dc-
H2 = gate voltage aid-
H1 = 24Vdc
secondary
primary
18