Fronius IG 300 - Manual (Page 62)

54
Replacing fuses
Criteria for selecting fuses:
1.
I
N
= 20 A
2. U
N
= 600 V DC and AC
3. Fuse dimensions: 10.3 x 35 - 38 mm
Explanation:
I
N
: Nominal current rating of fuse
U
N
: Nominal voltage rating of fuse
1. Undo two screws on each of the two bottom-most power modules
2. Remove these two power modules
NOTE! When replacing defective fuses, make sure that new fuses comply with
the criteria for fuse selection.
Important! Each power module has both an AC fuse (F4.x) and a DC fuse (F3.x). The
overview circuit diagram shows how fuses are assigned to the appropriate power modu-
les.
WARNING! Danger due to mains voltage and DC voltage from solar modules.
The connection area should only ever be opened by an authorised electrical
engineer, and only when the power is disconnected.
Replacing fuses
1
F4.1 F4.4 F4.7 F4.10 F4.13 F4.2 F4.5 F4.8 F4.1
1
F4.14
2
F4.0 F4.3 F4.6 F4.9 F4.12
3
F3.0 F3.1 F3.2 F3.3 F3.5 F3.6 F3.7 F3.4
F3.8 F3.9 F3.10 F3.1
1
F3.12 F3.13 F3.14
4
1
2