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5
Installing DC Input Power Cables
DC Input Terminal Selection
Number
Terminal
of Inputs
1
PV1-PV6
3
PV1, PV3, and PV5
5
PV1, PV2, PV3, PV4, and PV5
1. Before connecting DC input power cables, ensure that the original DC terminals have been
cut off. If the original DC connector is directly connected to the SUN2000-(15KTL-50KTL)-M3
series, the inverter may be burnt.
2. Use the positive and negative Staubli MC4 metal terminals and DC connectors delivered with
the SUN2000. 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. 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.
4. Ensure that the PV module output is well insulated to ground.
5. The DC input voltage of the SUN2000-30KTL/36KTL-M3 shall not exceed 1100 V DC under
any circumstance.
6. The DC input voltage of the SUN2000-25KTL/30KTL-NAM3 shall not exceed 1000 V DC
under any circumstance.
7. Before installing DC input power cables, label the cable polarities to ensure correct cable
connections.
8. If a DC input power cable is reversely connected and the DC switch is turned on, do not
perform operations 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.
1. Cut off the original DC terminals.
In the spare part replacement scenario, the
DC input power cables can be connected
only to PV1–PV6. If the DC input power
cables are connected to PV7 or PV8, the
inverter data cannot be transmitted to the
northbound device.
Number
Terminal
of Inputs
2
PV1, PV3
4
PV1, PV2, PV3, and PV5
6
PV1, PV2, PV3, PV4, PV5, and PV6
22
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