150
Electrical Tests
Insulation Resis-
tance
The inspections must be carried out with an open lid. Measurement of insulation resistance
must be carried out separately at the wall bracket and at the inverter!
- A clear understanding of the tests is required before beginning the work.
- The inverter must be removed from the wall bracket.
- Ensure the device to be checked has been securely disconnected from the AC grid
(mains power line [L and N] must not be connected). If the AC grid cannot be discon-
nected from the wall bracket, all GND terminals must be checked for the correct
torque.
- Strings must not be completed at the wall bracket. The insulation resistance test can
be carried out with module group connected.
- During measurements, all switches (DC disconnector on level I), controllers, etc. must
be closed.
- The Fronius SolarNet and DATCOM Ring must be disconnected
- The insulation resistance test must be carried out with correct polarity
During the test, insulation may not fall below the following values. The specified test volt-
ages must be observed *):
*) These requirements relate to DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. In addi-
tion, individual national requirements and standards must also be observed.
Legend: Primary = DC (DC+ and DC-) | Secondary = AC (L and N) | Ground = PE
Insulation resistance must be measured between the following points, both at the inverter
as well as at the wall bracket:
WARNING! An electric shock can be fatal. Insulation resistance is measured, in
part, using high voltage. Before the test is started, the procedure must be com-
pletely understood. Adhere to the following safety measures:
- As far as possible, restrict access to the working area.
- When carrying out the test, do not touch any other people and take measures
to ensure that no other people touch metal surfaces.
- Each time the insulation resistance measurement instrument is switched on,
there is a voltage present at the area being tested. The insulation resistance
measurement instrument must be fitted with an automatic self discharge unit.
- Throughout the test, suitable protective clothing/equipment must be worn.
- When carrying out the insulation resistance test, do not touch any other per-
sons and take measures to ensure that no other persons touch the back of
the solar module or the terminals of the solar module with any parts of their
body.
- Ensure that the insulation resistance test is carried out with the correct polar-
ity, as incorrect polarity may lead to incorrect measurement results.
WARNING! As the module group voltage has not been isolated at the wall brack-
et, the PV voltage remains at the terminals.
CAUTION! Due to the presence of DC voltages, take safety precautions and ob-
serve safety rules.
Measurement Test voltage Limit value
Primary –>
ground
At least the max. DC input voltage of the equipment,
but max. 1000 V
>= 1 M
Secondary –>
ground
>= 500 V >= 1 M
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