Fronius Symo 10.0-3-M Serviceanleitung, Ersatzteilliste Seite 175

Measurement Test voltage
Primary -> ground at least the max. DC input voltage of the device,
however max. 1000 V
Secondary -> ground >= 500 V
Legend: Primary = DC (DC+ and DC-) | Secondary = AC (L and N) | Ground = PE
The insulation resistance test must be conducted between the following points on both the
inverter and the mounting bracket.
However, on the DC disconnector, the measurements should only be taken at the screws,
not the contacts.
Ground to AC / Ground to DC
1 Measuring device
2 Inverter
9 Measuring line
WARNING!
An electric shock can be fatal.
Capacitors can charge during the insulation resistance measurement. After carrying out
the insulation resistance test, check that all tested potentials are de-energised before con-
tinuing with the safety inspection. Alternatively, the capacitors can be discharged by short-
circuiting the tested potentials or via the discharge function on the insulation tester.
Capacitor discharge time is at least 6 min.
Symo 10-20, Eco
(5)
Symo 10-20
(5)
Eco
Examples of measuring the insulation resistance.
Overvoltage PC board (5)
Limit value
>= 1 M
>= 1 M
175