Commissioning; Safety During Commissioning; Commissioning The Combiner Box; Requirements For Commissioning - SMA STRING-COMBINER DC-CMB-U15-16 Manuel D'installation

7

Commissioning

7 Commissioning

7.1 Safety during Commissioning

Danger to life from electric shock due to live voltage
•
High voltages are present in the live components of the Combiner Box. Touching live components results in death
or serious injury due to electric shock.
•
Wear personal protective equipment when working on the Combiner Box.
•
Do not touch live components.
•
Before performing any work, always disconnect the Combiner Box from voltage sources unless supply voltage is
absolutely necessary.
– Switch off the DC load-break switch in the Combiner Box.
– With power off, remove the DC fuses in the central inverter or main DC distribution box. Use the LV/HRC fuse
handle to do this.
– Only open the fuse holders when the Combiner Box is switched off.
•
Ensure that the device cannot be reconnected.
•
Ensure that no voltage is present.
•
Ground and short-circuit.
•
Cover or isolate any adjacent live components. Protective covers must always be mounted.

7.2 Commissioning the Combiner Box

7.2.1 Requirements for Commissioning

Commissioning must be performed by Service employees only
Commissioning of the Combiner Box must be performed by Service employees of SMA Solar Technology AG
or their authorized representatives only.
The commissioning report must be completed during commissioning.
Requirements:
o The DC load-break switch is switched off.
o The DC main cables are connected to the inverter or main DC distribution box and disconnected from voltage
sources.
o There is no reverse voltage from the inverter.
o All connections have been made in accordance with this manual (see Section 6 "Electrical Connection").
o The correct polarity of all connections has been ensured and documented.
o The floor around the Combiner Boxs is firm and freely accessible.
7.3 Voltage Check – Measuring Procedure
Use a voltmeter with a voltage range up to 1,500 V
measuring the open-circuit voltage of the panels obtained at minimum irradiation.
Requirements:
· Make sure that the inverter is switched off and disconnected on the DC side.
· Make sure that the disconnecting switch of the combiner is set to OFF.
· Make sure that the fuse box bases are open.
28 DC-CMB-IA-U15-xx-en
. This check is made by
DC
SMA Solar Technology AG
Installation Manual