PVCHECKs-PRO
EN - 24
4. Use the arrow keys or and select the position “Lim.”.
The display shows the screen to the side.
5. Use the arrow keys (,) to set the minimum limit
threshold for insulation measurement, which can be
selected among the values 0.05, 0.10, 0.23, 0.25, 0.50,
1.00, 50M. Please remember that standard
IEC/EN61557-2 sets 1M as a minimum value of
insulation resistance for installations with a rated voltage
higher than 120V.
M 15/10 – 18:04
(+) (-)
Vtest - - - - - - V
Riso - - - - - - M
Rp - - - M
VPN VPE VNE
0V 0V 0V
DUAL 1500V 1.00M
MODE Vtest. Lim.
6. Connect the instrument to the PV string to be tested as shown in Fig. 7. The test can
be carried out also on more strings connected in parallel to each other. Please
remember that it is also necessary to separate possible overvoltage protections
connected to the cables of the string(s) and that it is recommended to measure
upstream of possible blocking diodes.
Fig. 7: Instrument connection for insulation measurement in DUAL mode
CAUTION
Upon pressing the GO/STOP key, different error messages can be displayed
by the instrument (§ 6.4.3) and, therefore, the test cannot be started. Check
and eliminate, if possible, the problem causing the error message before
going on with the test
Do not touch the masses of the modules during the measurement as they
could be at dangerous potential even with the system disconnected due to
the voltage generated by the instrument
The measurement could give incorrect results if the earth reference is not
correctly connected to input E
We recommend a preliminary check of correct functioning of the instrument
before carrying out a measurement by short-circuiting terminals P, N and E,
checking an insulation value of almost zero and an out-of-scale value with
terminals P, N and E open
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