HT instruments PVCHECK - Manual (Page 31)

PVCHECK
EN - 29
6.3. QUICK CHECK ON PV MODULES AND STRINGS (IVCK)
6.3.1. Foreword
This function carries out a series of quick tests on a PV module/string, measuring in a
sequence:
 The Voc voltage and the short-circuit current Isc according to the prescriptions of standard
IEC/EN62446 with the possibility of measuring (by using the relevant probes) also the
irradiance and module temperature values.
 Insulation resistance measurement (if enabled – see § 5.5.1), only carried out in STRING
mode (see § 6.4.4) i.e. by automatically producing an internal short circuit between the
input terminals P and N and measuring between this short-circuit point and the input
terminal E.
 Continuity test of protective conductors (if enabled – see § 5.5.1) with 200mA between the
input terminals E and C of the instrument.
Irradiance measurement can be carried out in one of the following modes:
 Reference cell directly connected to PVCHECK
 Reference cell connected to SOLAR-02 in RF connection with PVCHECK
Irradiance measurements are always carried out in real time; it is therefore impossible to start
a “remote” recording of irradiance values through SOLAR-02.
If the minimum irradiance threshold (see § 5.1.5) is:
 = 0  the instrument does not control the presence of the reference cell, irradiance
changes, number of modules and does not display error messages is case it is
impossible to calculate Voc and Isc values transposed under STC. This mode is suitable
to carry out a test session on a considerable number of strings as quickly as possible.
 > 0 (recommended >700W/m 2
)  the instrument carries out all tests provided for I-V test,
manages all conditions and error messages for I-V test (wrong num. of mod., temp. out of
range, cell presence, min. irr., etc.) and calculated the values of Voc and Isc under STC.
This mode is recommended whenever accurate tests are to be carried out on
modules/strings being examined.
In general, the result page will include:
 Description of the module used
 Irradiance and temperature values (if available)
 Average values of Voc and Isc calculated as average of the corresponding values under
OPC on the last 10 tests saved in the memory. If the number of tests is < 10, the average
is calculated on the number of available tests. The first test will display dashes in the field
“average values” as there are no previous tests on which to calculate an average.
 The values of Voc and Isc measured under OPC as well as any partial result (only
available if STC values are not available) obtained by comparison with average values.
 The values of Voc and Isc calculated under STC (if available) and any partial result
obtained by comparing the values calculated under STC with the nominal ones (inserted
in DB modules).
 The overall test outcome (OK(NO). The overall result will be calculated based on the
partial results obtained:
 Based on partial results under STC (if these are available)
 Based on partial results under OPC (if STC values are not available)
The instrument will not display any overall result if no partial result is available.