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000972AG
8 - Maintenance
12. Voltage absence test on AC side (wiring box)
• Remove the AC protective shield
27
over the AC connection busbar
21
as shown in the picture.
27
27
• Visually inspect the components to identify the presence of any
overheating, signs of electric arcs, failure of the insulating devices,
loosen connections or cables not connected.
• Check there is no voltage on the AC connection busbar
21
downstream
of the AC breaker. Measuring between the all points (using the voltage
detector) refer to table below.
R
S
T
N
PE
Check
sequence
First
point
Second
point
1° check
R
PE
2° check
S
PE
3° check
T
PE
4° check
N
PE
5° check
R
S
6° check
S
T
7° check
T
R
8° check
R
N
9° check
S
N
10° check
T
N