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3.4
Installing the DC Input Power Cable
1. Ensure that the PV module output is well insulated to ground.
2. Use the Staubli MC4 positive and negative 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 warranty.
3. The DC input voltage of the SUN2000 shall not exceed 1100 V DC under any circumstance.
4. Before installing the DC input power cable, label the cable polarities to ensure correct cable
connections.
5. If the DC input power cable is reversely connected, do not operate the DC switch as well as
positive and negative connectors immediately. Failing to do so may cause device damage,
which 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 polarities of the DC input
power cable.
6. If the PV strings are configured with Smart PV Optimizers, refer to the Smart PV Optimizer
Quick Guide to check the cable polarity.
1. Assemble DC connectors.
Correct Wiring Terminals
Positive metal terminal
Negative metal terminal
Ensure that cable
polarities are correct.
PV-CZM-22100/19100 (Staubli)
Ensure that the cable cannot
be pulled out after being
crimped.
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.
7
Positive connector
Negative
connector
Click
PV-MS-HZ
Open-end Wrench
(Staubli)
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