HT PVCHECK, Руководство пользователя

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PVCHECK 24
6.2. MEASURING PARAMETERS ON PV PLANT WITHOUT USING SOLAR-02
The “PV installation efficiency” test carried out without using the optional remote unit
SOLAR-02 only allows evaluating output electrical parameters of a string or a photovoltaic
field (quantities, Vdc, Idc and Pdc), which can be periodically recorded with a programmable
integration period (see § 5.2.1). In this mode, the values of Irradiation, Te, Tc, the
nDC
efficiency value are not evaluated and no result is provided by the instrument.

CAUTION

The maximum voltage between inputs P and N is 1000VDC. Do not measure
voltages exceeding the limits given in this manual. Exceeding these limits could result
in electrical shocks to the user and damage to the instrument.

In order to guarantee the operator
’s safety, while making the connections, disable
the system being measured by means of the switches/breakers upstream and
downstream of the DC/AC converter (inverter)
Fig. 5: Instrument connection for measuring PV installation parameters without SOLAR-02
1.
Select the option “NO” as regards the type of remote unit to be used during EFF test (see §
5.1.4), set the full scale of the DC clamp (see § 5.2.1), a possible correction factor of the DC
clamp (see § 0), the integration period and the rated power of the system (see § 5.2.1 and §
5.2.2).
2.
In order to guarantee the operator’s safety, disable the system being measured by means of the
switches/breakers upstream and downstream of the DC/AC converter
(inverter)
3. Connect the inputs P and N respectively to the positive and negative output of the string,
respecting the colours indicated in Fig. 5
4. Connect the output connector of the DC clamp to the IDC input.
CAUTION
BEFORE CONNECTING THE DC CLAMP TO THE CONDUCTORS
Switch on the clamp, check the LED indicating the status of the clamp’s internal
batteries (if present), select the correct range, press the ZERO key on the DC clamp
and check on the display of PVCHECK the actual zeroing of the corresponding Idc
value (values up to 0.02A are acceptable).
5. Connect the DC current clamp to the positive output conductor of the string, respecting the
direction of the arrow found on the clamp itself as indicated in Fig. 5. Position the clamp so
that the jaw is not near the negative conductor.