Connecting The Pv Generator To The Device - Kaco blueplanet 87.0 TL3 M1 WM OD IIF0 Manual

7 | Installation
7.6

Connecting the PV generator to the device

7.6.1 Checking the PV generator for a ground fault
DANGER
Risk of fatal injury due to electric shock!
Severe injuries or death will result if the live connections are touched. When there is solar radiation on the PV
generator, DC voltage will be present at the open ends of the DC cables.
1. Activate the connection power at the switchbox or string combiner with the DC isolator switch.
2. The DC connection is intended exclusively for PV generators. Other sources fall within the scope of im-
proper operation (e.g. batteries).
3. Only touch the PV generator cables on the insulation. Do not touch the exposed ends of the cables.
4. Avoid short circuits.
5. Do not connect any strings with a ground fault to the device.
Ensuring that there is no ground fault
1. Measure the DC voltage between the protective earth (PE) and the positive cable of the PV generator.
2. Measure the DC voltage between the protective earth (PE) and the negative cable of the PV generator.
ð If stable voltages can be measured, there is a ground fault in the DC generator or its wiring. The ratio between
the measured voltages gives an indication as to the location of this fault.
3. Rectify any faults before taking further measurements.
4. Measure the electrical resistance between the protective earth (PE) and the positive cable of the PV generator.
5. Measure the electrical resistance between the protective earth (PE) and the negative cable of the PV generator.
ð In addition, ensure that the PV generator has a total insulation resistance of more than 2.0 MOhm, since the de-
vice will not feed in if the insulation resistance is too low.
6. Rectify any faults before connecting the DC generator.
7.6.2 Configuring the PV generator
CAUTION
Damage to components due to faulty configuration
In the expected temperature range of the PV generator the values for the no-load-voltage and the short circuit current
must never exceed the values for U
1. Observe limit values in accordance with the technical data.
NOTE
Type and configuration of the PV modules.
Connected PV modules must be dimensioned for the DC system voltage in accordance with IEC 61730 Class A,
but at least for the value of the AC grid voltage
NOTE
Dimensioning the PV generator
The device is designed with a reserve of DC short-circuit current resistance. This allows oversizing of the con-
nected PV generator. The absolute limit for the PV generator is the value of the max. short circuit current (ISC-
max.) and the max. open circuit voltage (Uoc max). See footnote under Electrical data
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and I in accordance with the technical data.
DCMAX SCMAX
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