6 Electrical Connection
SMA America, LLC
36
CU600-1000US-IA-en-10
Installation Manual
4. Strip the insulation of all cables by
13
⁄
32
in. (10 mm).
5. Check the positive DC cables for correct polarity
and connect them to the terminals with the plus sign
(
+
). Tip: the reverse polarity detection can be
carried out after connecting each string (see
Section 6.7 "Operating the Reverse Polarity
Detection", page 36).
6. Tighten the screw terminals with a screwdriver
(blade width: 4) (torque: 15 in-lb. (1.7 Nm)).
7. Check the negative DC cables for correct polarity
and connect them to the terminals with the minus
sign (
−
). Tip: the reverse polarity detection can be
carried out after connecting each string (see
Section 6.7 "Operating the Reverse Polarity
Detection", page 36).
8. Tighten the screw terminals with a screwdriver
(blade width: 4) (torque: 15 in-lb. (1.7 Nm)).
9. Ensure that all cables are connected with the right
polarity using the reverse polarity detection (see Section 6.7 "Operating the Reverse Polarity
Detection", page 36).
6.7 Operating the Reverse Polarity Detection
The reverse polarity detection of the Connection Unit 1000-US allows you to test if all cables have
been connected with the correct polarity.
Requirements:
☐ The DC cables of the PV array must be connected to the terminals.
☐ The DC switch-disconnector must be turned
OFF
and the lid dismantled.
☐ For the reverse polarity detection to function, the DC voltage must be at least 100 V.
Danger to life due to electric shock
The strings in the Connection Unit are combined to one main string. If there is reverse polarity of a
PV string, there can be short-circuit current flowing when string fuses are inserted, string safety levers
are closed, and the DC switch-disconnector is open.
• All safety levers must be opened all the way before you can use the reverse polarity detection.
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