CAPTION:
E: Green cable
P: Red cable
N: Black cable
1. Unearthed PV module/string
2. Main system earthing
Fig. 12: Instrument connection for insulation measurement in STRING mode
The maximum current which can be measured by the instrument is 10A. Before
carrying out the measures of Insulation in "STRING" mode, always ensure that
the instrument is connected to ONE STRING and not more strings in parallel to
avoid possible damage of it
4. Press GO/STOP to start the test. In case no error conditions
occur, the instrument displays the message “Measuring…” as
shown in the screen to the side.
5. When measurement is complete, the instrument provides the Ri
value, i.e. the minimum value of insulation resistance of the PV
module/string (or of other objects) being tested, continuously
measured during the whole duration of measurement. If the
result is higher than the minimum limit set, the instrument
displays the message “Outcome:OK”; otherwise, it displays the
message “Outcome:NO” as shown in the screen to the side.
6. Press the SAVE key to store the test result in the instrument’s
memory (see § 7.2) or the ESC/MENU key to exit the screen
without saving and go back to the main measuring screen.
6.4.4.1. Anomalous situations
1. In any operating mode, in case the instrument detects a voltage
higher than 1000V at terminals P-N, P-E and NE, it does not carry
out the test, gives out a long sound and displays the message “Vin
> 1000”.
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