SMA SMC 5000 Installation - Manual (Page 29)

SMA Technologie AG Installation
Installation Guide SMC50_60-11:SE2006 Page 29
PV String (DC) Connection
Connect the PV strings as follows:
1. Check the PV generator connections on their
correct polarity and compliance with the maxi-
mum string voltage of 600 V DC, see chapter
4.2 „Requirements: PV-Modules” (page 18).
The voltage from the strings is very dangerous! Be very careful
and pay attention to all applicable safety regulations!
2. Measure the DC voltages between each PV plug
connector of a string and ground potential. Fol-
low the safety instructions!
3. If the measured voltages are constant and their
total approximately corresponds to the open-cir-
cuit voltage of the string, a ground fault has oc-
cured in this string. The ratios of voltages
approximately indicate where the ground fault
can be found.
When you have found a ground fault in a string, only connect it to
the Sunny Mini Central 5000/6000 after you have removed the
cause for the ground fault in the PV generator.
4. Repeat steps 2 and 3 for each string.
5. Connect the trouble-free PV strings to the Sunny
Mini Central 5000/6000. Make sure to connect
them with correct polarization.
6. Close off the unneeded DC input sockets using
the protective caps supplied in the accessories
kit.
PE
String A
String B
+ + - -