Electrical installation 59
DC cabling connection for standard and -S models
WARNING! Do not do electrical work on the unit unless you are a qualified
electrician. Obey the instructions in Chapter Safety on page 11. Failure to obey
the safety instructions can cause injury or death, electromagnetic interference and
equipment malfunction.
To connect the DC cables on standard and -S models:
1. Set the DC switch to off on the inverter (-S model) and isolate the inverter from all power
sources. Refer to Inverter isolation on page 16.
2. Make sure that the strings are compatible with the inverter. Refer to Photovoltaic array
and inverter compatibility on page 35.
3. Make sure that the DC cables are marked with the correct polarity (+ or -). The markings
must be permanent so that they can be read throughout the lifetime of the inverter.
4. Use a voltmeter to make sure that the polarity of the strings is correct. Make sure that the
polarity corresponds to the cable markings.
5. Isolate the DC input cabling from the PV array.
6. Remove the DC input cover. Refer to DC input
cover on page 51.
7. Remove the cable gland sealing plugs.
8. Remove 16 mm of the insulation from the cables.
9. Put the string cables through the cable glands.
The cable glands accommodate cable diameters
of 6…12 mm.
10. Put the conductors into the correct screw
terminals according to their polarity.
11. Tighten the screw terminals (with a 1.0x5.5 flat or
PZ2 driver) to 2.4…4.0 N·m.
12. Make sure that the wires are secure and cannot be pulled from the terminals.
13. Make sure that the polarities are correct.
14. Make sure that the cables are routed tidily and have no sharp bends.
15. Tighten the cable glands.
16. Attach the DC input cover.
To Next Page
Loading...
