114
Electrical Tests
Insulation Resis-
tance
WARNING!
An electric shock can be fatal. Some of the insulation resistance measurements are
taken under high voltage.
The process must be completely understood before starting the test. Observe the following
safety precautions:
► Restrict access to the work area as far as possible.
► Do not touch any other person while performing the test and take measures to prevent
other people touching any metallic surfaces.
► A voltage is applied to the testing area each time that the insulation resistance testing
equipment is switched on. The insulation resistance testing equipment must be fitted
with an automatic self-discharge device.
► Wear suitable protective clothing/protective equipment while conducting the test.
► When carrying out the insulation resistance test, do not touch any other person and put
measures in place to prevent other people touching the back of the solar module or the
terminals of the solar module with any part of their body.
► Ensure that the polarity is correct while conducting the insulation resistance test to
avoid unreliable test results.
WARNING!
As the module array voltage has not been disconnected from the wall bracket, PV
voltage is still present at the terminals.
These tests must be carried out while the cover is open. The insulation resistance test must
be carried out separately on the wall bracket and on the inverter.
- A thorough understanding of the tests is required before starting the work.
- The inverter must be taken out of the wall bracket.
- Ensure the device to be checked has been securely disconnected from the AC grid
(grid power line [L and N] must not be connected). If the AC grid cannot be disconnect-
ed from the wall bracket, the torques applied to all ground terminals must be checked.
CAUTION!
Take safety precautions.
Observe the safety rules – DC voltage present!
- Strings must not be disconnected from the wall bracket. The insulation resistance test
can be carried out when the module array is connected.
- All switches (DC disconnector at position I), controllers, etc. must be closed during the
measurements.
- The inverter must be disconnected from Fronius Solar Net and from the Datcom ring
- The polarity must be correct when the insulation resistance test is conducted
The following minimum insulation values apply. The test voltages specified must be ob-
served *):
*) These requirements comply with DIN VDE 0701-0702 and ÖVE/ÖNORM E8701-1. Also
refer to the applicable requirements and standards in your country.
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