15Ap1:3 Overvoltage And Undervoltage Protection - ESAB Aristo Mig 3001i Service Manual

15AP1:3 Overvoltage and undervoltage protection
WARNING!
Dangerous voltage. Mains voltage on circuit board 15AP1 when
connected to the 400 V supply.
0 VA on power board 15AP1 is connected to the mains supply.
0 VA is galvanically isolated from 0 V.
The overvoltage and undervoltage protection generates a fault signal if the
voltage across capacitors 15C1 and 15C2 falls outside the permitted interval of
300 - 715 V DC, which is equivalent to a mains voltage of 212 - 505 V AC.
In the event of a fault, the display panel will show fault code 5.
The fault state will not be reset until the DC voltage is within 400 to 650 V.
During normal operating conditions, the voltage between pins CN08:6 and 7
on circuit board 15AP1 is about 0.1 V. Optocoupler IC4 is used for galvanic
isolation of the voltage monitoring circuit from control board 20AP1.
A break in any of the conductors to/from 15AP1, as shown in the diagram
above will result in a fault state.
S0740 800 196/E101019/P76
- 20 -
ca41_15_1