Installing Dc Input Power Cables - Huawei SUN2000 Series Quick Manual

4.4

Installing DC Input Power Cables

1. Use the positive and negative Staubli MC4 metal terminals and DC connectors supplied with
the solar inverter. Using incompatible positive and negative metal terminals and DC
connectors may result in serious consequences. The caused device damage is not covered
under any warranty.
2. You are advised to use the PV-CZM-22100 (Staubli) crimping tool and do not use it with the
positioning block. Otherwise, the metal terminals may be damaged. The PV-MS (Staubli) or
PV-MS-HZ (Staubli) open-end wrench is recommended.
3. Ensure that the PV module output is well insulated to ground.
4. The DC input voltage of the SUN2000-29.9KTL/30KTL/36KTL/40KTL-M3 shall not exceed
1100 V DC under any circumstance.
5. The DC input voltage of the SUN2000-20KTL-M3 shall not exceed 800 V DC under any
circumstance.
6. Before installing DC input power cables, label the cable polarities to ensure correct cable
connections.
7. If a DC input power cable is reversely connected and the DC switch is turned on, do not
operate on the DC switch or the positive/negative connectors immediately. Otherwise, the
device may be damaged. The caused device damage is not covered under any warranty. Wait
until the night when solar irradiance declines and the PV string current drops to below 0.5 A.
Then set the DC switch to the OFF position, remove the positive and negative connectors, and
correct the polarity of the DC input power cable.
8. If the SUN2000 is used with an optimizer, the number of optimizers for a single PV string
cannot exceed 25.
9. If the PV string is configured with an optimizer, check the cable polarity by referring to the
smart PV optimizer quick guide.
1. Connect the DC power cables.
Positive metal
terminal
Negative metal
terminal
PV-CZM-22100
Ensure that the cable
cannot be pulled out
after being crimped.
Click
Positive connector
Negative
Click
connector
Ensure that the
cables are correctly
connected.
7
Use the wrench
shown in the figure to
tighten the locking
nut. When the wrench
slips during the
tightening, the
locking nut has been
tightened.
PV-MS-HZ
Open-end
wrench